No niestety, ja chińskich dialektów nie znam. A można by ciekawych rzeczy o samym układzie się dowiedzieć. Po angielskiemu: 1037612 Osobiście interesują mnie układy scalonych odbiorników radiowych. W wątku Wnętrze starego, polskiego odbiornika radiowego Ania R612 produkcji Unitry trochę o tym pisałem ja i uczestnicy.Chodzi o te najstarsze ,najprostsze ,ale nawet bardziej "scalone i dużo potrafiące" też chętnie oglądne.Pozdrawiam.
Q-Technology Co., Ltd. (AKC technology limited)
AKC6955 stereo FM / TV / MW / SW / LW digital tuning radio
Device Overview
application
AKC6955 Integrated FM radio complete
•
Desktop radios, portable radios
/ The television audio / MW / SW receiver function, including
•
Clock radios
input from the antenna to the stereo audio output of all modules.
•
Boom boxes
Chip supports worldwide FM / TV sound / long wave / MW / SW
bands.
Package
•
TSSOP24 Package
Features
Pin
•
stand by 30 ~ 230MHz Any frequency FM demodulation
•
stand by 0.15 ~ 30MHz Any frequency AM demodulation
•
Preset FM band ( 64 ~ 108 MHz )
•
stand by TV1 audio( 56.25 ~ 91.75 MHz )
•
stand by TV2 audio( 174.75 ~ 222.25 MHz )
•
Presets wave band ( 520 ~ 1730 KHz )
•
Preset shortwave band ( 3.2 ~ 21.9 MHz )
•
Preset long-wave band ( 150 ~ 285 KHz )
•
Custom support band
•
It supports a wide supply voltage range: 2.0V ~ 4.5V
•
stand by 32.768KHz & 12MHz Passive mode crystal reference clock and
•
Integrated audio amplifier (maximum power differential 0.5W )
•
Two kinds of control volume: volume potentiometer and the volume register
•
Two kinds of de-emphasis modes: 50us / 75us
•
Support tuning lamp function
•
The audio output may be in phase, may be inverted output
•
Support for stereo line input
•
Support low-power standby mode, 3V When power consumption 10uA
•
Internal integrated PLL
•
Intelligent frequency control
•
AGC
•
Precise digital demodulation
•
Smart mute function
•
SW Increased tracking filter, greatly improving SW Audibility
•
MW Precise tuning adaptive front end
•
FM Subwoofer
•
integrated LDO
•
•
According to the battery voltage, automatically adjust the volume
Pb-free / RoHS compliant
Preliminary V2.3
Page 1 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
table of Contents
1 Technical Specifications .................................................. ........................................ 3
1.1 Limit index ................................................ ............. 3
1.2 Recommended operating conditions ............................................... .......... 3
1.3 DC characteristics ................................................ ............. 3
1.4 Reception characteristics ................................................ ............. 4
1.4.1 FM and TV sound .............................................. .. 4
1.4.2 Medium wave and long wave reception characteristics ............................................ 4
1.4.3 Shortwave reception characteristics ............................................... ... 5
1.5 Crystal property requirements .............................................. ......... 5
2 I2C Interface Timing .................................................. ............................... 6
3 I2C A single-byte register operation .................................................. .................. 7
3.1 Single-byte write operation ............................................. ............ 7
3.2 A single-byte read ............................................. ............ 7
4 I2C Multi-byte register operation .................................................. ................. 8
4.1 Multi-byte write (continuous write, byte count & gt; = 2) .................................. .. 8
4.2 Multi-byte read operation (continuous reading, the number of bytes & gt; = 2) .................................. .. 8
5 Quick station search logic .................................................. ................................. 8
6 Application Circuit .................................................. .................................... 9
7 Register Definition .................................................. .................................. 10
7.1 Register map ................................................ .......... 10
7.2 Register operations, detailed explanation ............................................. ... 11
7.2.1. Register operations ................................................ ... 11
7.2.2 Register detailed explanation ............................................... 11
8 Pin definitions .................................................. ....................................... 17
8.1 AKC6955 pin definition .............................................. ...... 17
9 Receiving TV sound .................................................. ............................... 18
10 TSSOP 24 Package .................................................. ........................ 19
Preliminary V2.3
Page 2 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
1 Technical Specifications
1.1 Limit indicator
Table 1. Limit indicator
parameter
Symbols or test strips
Min Typ Max
Item
unit
- 0.5
-
5.8
- 0.3
VBAT
VBAT + 0.3
Operating temperature
- 40
-
85
°C
Storage temperature
- 55
-
150
°C
Power supply
I2C interface input voltage
VBAT
SCLK, SDIO
V
V
0.8
The maximum signal reception
Vpk
2
Pin antistatic
KV
Beyond the limits of the conditions listed above, it can cause permanent damage or deterioration indicator device.
1.2 Recommended operating conditions
Table 2. Recommended operating conditions
parameter
Power supply
Symbols or test conditions Minimum Typical Max unit
2
VBAT
Input digital signal low threshold
SCLK, SDIO
Low threshold output digital signal
SDIO, TUND
V
V
0.2 * VBAT
SDIO, TUND
High threshold output digital signal
4.5
0.3 * VBAT
SCLK, SDIO
Input digital signal high threshold
3.3
V
0.7 * VBAT
V
0.8 * VBAT
-
- 40
Operating temperature
85
°C
1.3 DC Characteristics
(VBAT = 3V, VIO = 3 V, T A = 25 ° C, The other is the default, unless otherwise noted)
Table 3. DC Characteristics
parameter
Symbols or test conditions
Min Typ Max Units
FM mode
Drive external audio amplifier
Maximum volume, is not connected speakers or headphones
32.5
35
mA
Built-in audio amplifier driving
Maximum volume, is not connected speakers or headphones
34
37
mA
TV Sound Mode
Drive external audio amplifier
Maximum volume, is not connected speakers or headphones
32.5
35
mA
Built-in audio amplifier driving
Maximum volume, is not connected speakers or headphones
34
37
mA
AM mode
Drive external audio amplifier
Maximum volume, is not connected speakers or headphones
30.5
33
mA
Built-in audio amplifier driving
Maximum volume, is not connected speakers or headphones
32
35
mA
Drive external audio amplifier
Maximum volume, is not connected speakers or headphones
30.5
33
mA
Built-in audio amplifier driving
Maximum volume, is not connected speakers or headphones
32
35
mA
10
30
Shortwave mode
SHUTDOWN mode
Quiescent Current
Preliminary V2.3
When the 3V power supply from about 45uA about 10uA, 4.5V power
Page 3 of 19
last update on 2012-11-1
μA
Q-Technology Co., Ltd. (AKC technology limited)
1.4 Reception characteristics
(VBAT = 3V, T A = 25 ° C, The other is the default, unless otherwise noted)
1.4.1 FM and TV sound
Table 4. FM reception characteristics
parameter name
symbol
Test Conditions
Typical minimum value maximum value unit
FM Frequency Range
FM fr
64
-
108
MHz
TV1 Frequency Range
TV1 fr
56.25
-
91.75
MHz
TV2 Frequency Range
-
Predefined band
TV2 fr
174.25
222.25
MHz
Low noise amplifier input resistor
Zin
-
200
-
ohm
LNA input capacitance
Cin
-
2
-
pF
-
7
-
dBuV
-
50
-
dB
-
twenty three
-
dBuV
-
31
-
dB
-
43
-
dB
-
NA
-
-
60
-
dB
-
50
-
dB
-
0.1
-
dB
4500
Hz
Sen
Practical sensitivity
Mod = 22.5K Ref out
SINAD = 30dB
URF = 1mV Ref out
SNR
Best signal to noise ratio
Mod = 22.5K
Mod = 75K pilot & stereo
Stereo lighting sensitivity
URF = 1mV Mod = 75K
Stereo separation
Pilot & Stereo
IMR
Image Rejection
300K Adjacent Channel selectivity ACS 300K
Mod = 22.5K IMR = RF + 2
* IF SNR = 30dB
Mod = 22.5K
+ / -300K SNR = 30dB
Mod = 22.5K ± 1MHz
Spurious suppression
SNR = 30dB
URF = 1mV FM
mod = 22.5K AM mod
AM suppression
= 30%
Left and right channel amplitude balance
URF = 1mV Mod = 22.5K
Ref out
URF = 1mV Mod = 22.5K
Audio Frequency Response
50uS De loss = 6dB
URF = 1mV Mod = 22.5K
-
125
THD max
The maximum distortion
URF = 1mV Mod = 22.5K
Max out Vdd = 3V
URF = 100mV Mod = 75K
Strong signal distortion
Ref output
Vdd = 3.6V Urf = 1mV Mod
22.5K Maximum power
= 22.5K Max out
Vdd = 3.6V Urf = 1mV Mod
75K Maximum power
= 75K Max out
Vcm
The audio output common mode
Station search time
0.6
-
%
-
20
-
%
-
4
-
%
-
50
-
mW
-
600
-
mW
-
Ref out Vdd = 3V
-
VDD / 2
-
-
THD
Distortion
40
-
V
ms / chan
MinV
1
-
ses
-
boot time
The minimum operating voltage
2
-
V
1.4.2 Medium wave and long wave reception characteristics
Table 5. Polish and Long wave reception characteristics
parameter name
symbol
Test Conditions
Typical minimum value maximum value unit
LW Frequency Range
LW fr
Predefined band
150
-
285
KHz
MW Frequency Range
MW fr
Predefined band
510
-
1730
KHz
Practical sensitivity
Sen
Signal to Noise Ratio
Preliminary V2.3
SNR
Long bar magnet 80mm Lind = 350uH ~ 450uH
SNR = 20dB
Mod = 30% Urf = 100dBuV
Page 4 of 19
-
82
- dBuV
-
40
-
last update on 2012-11-1
dB
Q-Technology Co., Ltd. (AKC technology limited)
Adjacent Channel selectivity
Mod = 30% ADJ = RF +/- 10KHz
ACS
-
SINAD = 20dB
40
-
30% The maximum volume output
VDD = 3.6V Mod = 30% Max vol
-
50
- mW
80% The maximum volume output
VDD = 3.6V Mod = 80% Max vol
-
380
dB
- mW
Urf = 100dBuV Mod = 30%
Distortion
Image Rejection
50
-
THD
Mod = 30% Fimr = Frf + 2 * IF
IMR
SINAD = 20dB
Best signal to noise ratio
Max Vol Mod = off
The maximum random noise
-%
50
-
dB
49
-
dB
-
Urf = 100dBuV Mod = 30% Ref out
1.2
-
Loss = 6dB
-
-
Audio Frequency Response
30
- mV
Hz
4000
Zin
-
& gt; 1M
-
Vcm
-
VDD / 2
-
Zapping time
-
35
-
boot time
-
1
-
LNA input impedance
Output common mode
ohm
V
us / chan
S
1.4.3 Shortwave reception characteristics
Table 6. Shortwave reception characteristics
parameter name
symbol
Signal to Noise Ratio
10KHz adjacent channel rejection
Typical minimum value maximum value unit
Fr
Predefined band
3.2
21.9
MHz
Sen
30% of modulation, SINAD = 20dB
-
20
-
dBuV
SNR
60dBuV, 30% of modulation
-
50
-
dB
ACS
30% of modulation, SINAD = 20dB
-
40
-
dB
Frequency Range
Practical sensitivity
Test Conditions
-
30% of the maximum volume output
Maximum volume, 3.6V power supply
-
50
-
mW
80% of the maximum volume output
Maximum volume, 3.6V power supply
-
380
-
mW
100dBuV, AF = 1KHz, Mod = 30%, corresponding to
Audio Frequency Response
Distortion
Image Rejection
50
an output audio frequency attenuation 6dB
-
Hz
4000
-
attenuation 10dB, Urf1-Urf2
Differences Urf = 126dBuV, to
Modulation hum
the modulation and modulation
The maximum random noise
The maximum volume output, to modulate
LNA input impedance
%
-
dB
& gt; 79
-
dB
- 49
-
dB
-
Urf = 126dBuV, Urf reduced until the audio output
AGC characteristic
-
-
SINAD = 20dB + 2 * IF
45
-
100dBuV, Mod = 30%, AF = 1Khz
IMR
1.2
-
30
-
mV
-
THD
& gt; 1
-
Mohm
-
VDD / 2
-
Zapping time
-
35
-
boot time
-
1
-
The audio output common mode voltage
us / chan
S
1.5 Crystal property requirements
Table 7. Passive crystal properties
parameter name
32.768KHz Passive crystal
Series resonant impedance
symbol
Test Conditions
100
--100
United resonant impedance
ESR
--20
Crystal frequency deviation
100
ppm
KΩ
20
0
KΩ
50
ESR
Crystal frequency deviation
12MHz Passive crystal string
unit
Typical minimum value maximum value
ppm
Table 8. The active reference clock characteristics
Preliminary V2.3
Page 5 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
parameter name
symbol Test Conditions
unit
Typical minimum value maximum value
Audio output SINAD more than the
Rms jitter
2
40dB
ns
Low voltage input reference clock
Support sine and square wave
- 0.1
0.4
V
A high voltage input reference clock
Support sine and square wave
1.2
1.8
V
100
ppm
2
0
--100
Clock frequency deviation
I2C Interface Timing
The chip supports I2C protocol version 2.1, the maximum data rate of 400KHz. Below are a timing chart of write:
Table 9. I2C Interface Timing
parameter
symbol
Minimum
Typical values
Fscl
SCLK frequency
SCLK high duration
-
Thigh
SCLK low duration
unit
Maximum
400
KHz
-
0.6
-
us
Tlow
1.3
-
-
us
I2C start falling SDIO advance
Tsu: sta
0.6
-
-
us
I2C start falling retention capacity SDIO
Thd: sta
0.6
-
-
us
I2C falling edge on the end of hysteresis SDIO
Tus: tso
0.6
-
-
us
SDIO input to the rising edge of SCLK advance
Tsu: dat
100
-
-
ns
SDIO retention amount is input to the rising edge
Thd: dat
0
-
900
ns
Tbuf
1.3
-
-
us
Tsp
-
-
50
ns
of SCLK
Started to the end of time
Enter the pulse time
Tsu: sta
SDIO
Tbuf
Tsp
Tsu: dat
Thd: sta
Tsu: sto
Thd: dat
SCLK
1-7
START
Tsu: sta
Address
8
Read = 1
9
ACK
1-7
9
ACK
Data high byte
8
9
NACK
Data low byte
STOP START
Tbuf
Tsp
Tsu: dat
Thd: sta
SDIO
8
1-7
Tsu: sto
Thd: dat
SCLK
1-7
START
Address
8
Write = 0
9
ACK
1-7
8
Data high byte
9
ACK
1-7
Data low byte
8
9
ACK
STOP START
Figure 1. I2C Read and write timing control
Preliminary V2.3
Page 6 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
3 I2c A single-byte register operation
3.1 Single-byte write operation
3.2 A single-byte read
Step1 : Address configuration register (a write operation)
Step2 : Read register value ( i2c Read)
Preliminary V2.3
Page 7 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
4 I2c Multi-byte register operation
4.1 Multi-byte write (continuous write, byte count & gt; = 2 )
Note: If the current write is the last register (address = 0x1D), the Slave in the Ack cycle will
Nack sent to the I2C master, reminding the end of the current write operation.
4.2 Multi-byte read operation (continuous reading, the number of bytes & gt; = 2 )
Step1 : Address configuration register (a write operation)
Step2 : Read register value ( i2c Sequential read operation)
5 Quick station search logic
a) fast channel search preparations:
Setup Mode
fm_en = " 1 " FM mode, " 0 " AM mode;
Set Band
Have decided to register amband and fmband
Station search direction
seekup = " 1 " , the channel number is increased toward a search direction " 0 " , the direction of the channel number
reduced search, the band end after the other end to the band
Also set for the FM station
Tuning register space intervals determined
search interval
b) do a tune operation and will register tune set to " 0 " , then set to " 1 "
Preliminary V2.3
Page 8 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
c) seek register is set to " 0 " and then to " 1 " to trigger the fast channel search logic;
d) before the internal logic channel search is not over, as desired interrupted intentionally seek register may be set to " 0 " to;
Automatic end condition e) has an internal two channel search logic: End station search, the whole band without end station, whichever junction
Beam, the register set will stc to " 1 " , the client can learn mode register stc polling station search logic is finished;
f) determining whether the station can be tuned in accordance with the register is " 1 " determination, " 1 " is the radio
g) Each number takes about 35ms.
6 Application Circuit
3n
100p
25K
22u
1n
1n
50K potentiometer
Headphone jack
AKC6955
47uF
27p
27p
MCU
1000u
1n
note:
All radio operations, both MCU write register to complete, including the mode switching, band switching, frequency settings, like zapping operation, the MCU
further HMI is completed, including the management of the display, and the like deposit station station search operation ;
Preliminary V2.3
Page 9 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
7 Register Definition
The chip I2C register array corresponding to the address is " 0,010,000. "
7.1 Register Map
Register read-write registers 0 to 19, 20 to 27 for the read-only registers.
address
bit7
0_RW
power_on?
0x4C
bit6
" 0 " ?
bit5
seekup?
tune?
seek?
" 1 " ?
" 0 " ?
" 0 " ?
bit2
bit1
rsv?
" 1 " ?
" 00 " ?
amband [4: 0]? " 00010 "
rsv?
ref_32kmode
" 0 " ?
fmband [2: 0]? " 000 "
FM1,87 ~ 108?
mode3k?
" 1 " ?
bit0
mute?
" 1 " ?
MW2,9K wave?
0x10
0x4A
bit3
fm_en?
1_RW
2_RW
bit4
chan [12: 8] 13'd2760??
" 0 " ?
" 01010 " ?
3_RW
chan [7: 0] 13'd2760??
0xC8
" 11001000 " ?
4_RW
usr_chan_start [7: 0]? " 8'd25 "
FM 50M???
0x19
5_RW
usr_chan_stop [7: 0]? " 8'd50 "
FM 70M???
0x32
6_RW
volume [5: 0]? " 101000 "
7_RW
0xA1
line?
volume level 48?
0xA1
rsv?
rsv?
" 1 " ?
De?
" 0 "
phase_inv?
" 0 " ?
BBEN?
" 1 " ?
Stereo?
" 0 " ?
" 1 " ?
Mono?
bw [1: 0]?
" 0 " ?
" 0 " ?
" 01 " ?
8_RW
fm_cnr_th [1: 0]?
am_cnr_th [1: 0]?
fd_th [1: 0]
stereo_th [1: 0]?
0x58
" 01 " ?
" 01 " ?
" 10 " ??
" 00 " ?
9_RW
rsv?
pd_adc_vol?
" 0000 " ?
0x07
10_RW
rsv?
0x00
space [1: 0]?
" 11 " ?
0xE0
13_RW
" 1 " ?
rsv?
" 10 " ?
pd_adc?
??
" 0 " ?
" 0000 " ?
rsv? " 0000?
pd_rx?
" 0 " ?
rsv?
st_led?
" 0 " ?
0000 " ?
rsv?
" 0 "
vol_pre?
" 00 " ?
rsv?
" 00 " ?
" 00 " ?
Chip reserved word, using the internal digital logic tests, values of these registers do not change during normal use?
14 ~ 19_RW
20_R
lv_en?
" 1 " ?
rsv? " 0111?
11_RW
0x00
rsv?
" 1 " ?
1111 " ?
0x7F
12_RW
osc_en?
" 0 " ?
? " 40 " " 82 " " CC " " FD " " 80 " " 80 " ?
STC?
ST?
21_R
readchan [12: 8]?
Tuned?
readchan [7: 0]?
22_R
mode3k_f?
cnram [6: 0]?
23_R
st_dem?
cnrfm [6: 0]?
24_R
pgalevel_rf [2: 0]?
25_R
rsv?
vbat [5: 0]?
rsv?
26_R
27_R
pgalevel_if [2: 0]?
fd_num [7: 0]?
rssi [6: 0]?
rsv?
Preliminary V2.3
Page 10 of 19
last update on 2012-11-1
lvmode?
Q-Technology Co., Ltd. (AKC technology limited)
7.2 Register operations, detailed explanation
7.2.1. Register operations
I2C write mode: 0-19 registers, a write operation may be performed continuously, from the register 0 to register 19 all finished, may be
performed a single register write operation;
I2C read mode: 0-27 registers, a read operation may be performed continuously, from the register 0 to register 27 read all, may be
performed a single register read operation;
7.2.2 Detailed explanation Register
Table 10. Register Description
Reg0: configure register 0 (default: 0x4c) Address
(Type)
BIT
0x00
(RW)
7
Label
power_on
Default
0
Function Description
Remark
1- 0 - Chip chip work
does not work
1-- FM mode 0--
6
fm_en
1
5
tune
0
tune operation completes.
4
seek
0
tune operation completes.
3
seekup
1
AM mode
0- & gt; 1 Trigger tune process The STC bit is set high when the
0- & gt; 1 Trigger tune process The STC bit is set high when the
Seek direction control bit 0 -
2 mute
1: 0
Preliminary V2.3
rsv
1
00
Seek down 1 - Seek up
1 - Mute L / R channel 0 Normal operation
Debug use, do not change this value using
Page 11 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
Reg1: configure register 1 (default: 0x10) Address
(Type)
BIT
Default
Label
Function Description
Remark
00000, LW, 0.15 ~ 0.285, 3K station search 00001,
0x01
MW1,0.52 ~ 1.71, 5K station search 00010, MW2,0.522
(RW)
~ 1.62, 9K station search 00011, MW3,0.52 ~ 1.71, 10K
station search 00100, SW1,4.7 ~ 10, 5K station search
00101, SW2,3.2 ~ 4.1, 5K station search 00110,
SW3,4.7 ~ 5.6,
Band seek
5K station search
logic chip only
00111, SW4,5.7 ~ 6.4, 5K station search 01000,
SW5,6.8 ~ 7.6,
7: 3 amband
0x2
valid for tune
5K station search
logic,
01001, SW6,9.2 ~ 10, 5K station search 01010,
frequency can
SW7,11.4 ~ 12.2, 5K station search 01011,
SW8,13.5 ~ 14.3,
be adjusted at
5K station search
01100, SW9,15 ~ 15.9,
any stage
5K station search
01101, SW10,17.4 ~ 17.9,
5K station search
01110, SW11,18.9 ~ 19.7, 5K station search 01111,
SW12,21.4 ~ 21.9, 5K station search 10000, SW13,11.4
~ 17.9, 5K station search
10010, MW4, 0.52 to 1.73,
5K station search
Other, custom band, station search interval = mode3k 3K:? 5K
000, FM1,87 ~ 108, station search space specified intervals 001,
Band seek
FM2,76 ~ 108, station search space specified intervals 010, FM3,70 ~
93, with a space station search interval set 011, FM4,76 ~ 90, Tuning
0x0
predetermined space intervals 100, FM5,64 ~ 88, with a space station
logic,
search interval set 101, TV1,56.25 ~ 91.75, station search space
frequency can
be adjusted at
110, TV2, 174.75 ~ 222.25, found 111 sets predetermined space
fmband
valid for tune
specified intervals
2: 0
logic chip only
any stage
intervals, custom FM, station search space specified intervals
Reg2: configure register 2 (default: 0x4A) Address
(Type)
BIT
7
0x02
Default
Label
rsv
0
6 Ref_32k_mo
1
5 Mode3k
(RW)
0
de
Function Description
Remark
Chip test, do not change this value
1- 32.768K 0- reference clock to the
reference clock 12M
AM is 1- 3K custom channel number as the AM
mode 0- custom channel number pattern 5K
High channel number 5, the channel number and frequencies related as
follows: FM mode: Channel Freq = 25kHz * CHAN + 30MHz AM mode, when
4: 0 Chan [12: 8]
Preliminary V2.3
0x0A
5K channel number pattern:. Channel Freq = 5kHz * CHAN AM mode, 3K
channel number pattern. when: Channel Freq = 3kHz * CHAN.
Page 12 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
Reg3: configure register 3 (default: 0xC8) Address
(Type)
BIT
Default
Label
Function Description
Remark
The lower 8 bits of the channel number
0x03
7: 0 Chan [7: 0]
0xC8
(RW)
Note: MCU, when the work MW2, into channel number must be a multiple of
three to ensure. Otherwise, the radio will be a mess.
Reg4: configure register 4 (default: 0x19) Address
(Type)
0x04
BIT
7: 0 usr_chan_sta
rt
(RW)
Default
Label
0x19
Function Description
Remark
Custom channel band start number chan =
32 * usr_chan_start
Reg5: configure register 5 (default: 0x32) Address
(Type)
0x05
(RW)
BIT
Default
Label
7: 0 usr_chan_sto
p
0x32
Function Description
Remark
Custom end-band channel number chan =
32 * usr_chan_stop
Reg6: configure register 0 (default: 0xA1) Address
(Type)
BIT
Default
Label
Function Description
Remark
Volume: 0 ~ 63
0x06
(RW)
7: 2 volume
0xA0
pd_adc_v ol = 1
& lt; 24: mute, 24 ~ 63 40 Total volume control, 1.5dB 24 each stage: - min
by volume
volume 63: - max volume
when the
register
To conserve
power, the time
1
line
0- line input mode
line may be set
Radio Mode 1 -
0
to 1 pd_rx and
pd_adc
0 phase_inv
0- audio output inphase, 1- speakers for audio output, push
1
the two inverted for pushing a speaker
Reg7: configure register 0 (default: 0xA1) Address
(Type)
BIT
Default
Label
7
0x07
rsv
1
6
rsv
0
(RW)
Function Description
Remark
Measured using, set to " 0 " during normal use
Measured using, do not change this value
De-emphasis mode
5 de
1
selection 0-
75 μ s (USA) 150 μ s (China)
Base boost enable 0-
4 bben
0
3
0
Close bass 1The subwoofer
stereo
{Stereo, Mono}
" 00 " the auto stereo, there Stereo_th control threshold " 10 " as
2 mono
Preliminary V2.3
0
long as the pilot is forced stereo " x1 " forced mono demodulator
Page 13 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
FM channel bandwidth
selection 00
200K
50K
11
01
150K
01
10
1: 0 bw
100K
Reg8: configure register 8 (default: 0x58) Address
(Type)
BIT
Default
Label
Function Description
Remark
When the FM mode, chip sets and lighting sentence carrier to noise
0x08
(RW)
ratio limit 00-2dB 01-3dB 10-4dB 11-5dB door
7: 6 fm_cnr_th 01
When AM mode, chip sets and lighting sentence carrier to noise ratio threshold
MW / LW
SW
00:
01:
10dB
7dB
10:
14dB
11dB
11:
5: 4 am_cnr_th 01
6dB
18dB
3dB
15dB
Taiwan chip and sentenced to light with the frequency deviation threshold
FM LW MW / SW 00: 12K
3: 2 fd_th
0.6K 01: 24K
10
0.2K
0.6K 1.2K 10: 36K 1K
1.8K
11: 48K
1: 0 stereo_th
1.4K 2.4K
FM stereo demodulation start CNR threshold
00
00-4, 01-8, 10-12,11-16
Reg9: configure register 0 (default: 0x07) Address
(Type)
BIT
7: 4 rsv
0x09
Default
Label
0000
Remark
Measured using, do not change this value
0- volume potentiometer mode
3 pd_adc_vol 0
(RW)
Function Description
register volume 1-i2c
Oscillator source selection
2
osc_en
1
0-External XO 1-Crystal
1
rsv
1
Measured using, do not change this value
0
lv_en
1
When low voltage power supply, whether to enter the low-voltage operation mode can
Reg11: configure register 11 (default: 0xE0) Address
(Type)
BIT
Label
7: 6
rsv
Default
11
Function Description
Remark
Measured using, do not change this value
0x0B
FM station search
(RW)
stepping 00-25kHz
5: 4
space
10
01-50kHz 10-100kHz
11-200kHz, TV1 and TV2 for the file is still 100K
3: 0
Preliminary V2.3
rsv
0000 measured using, do not change this value
Page 14 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
Reg12: configure register 11 (default: 0xE0) Address
(Type)
BIT
Label
7
pd_adc
0
6
res
0
5
pd_rx
0
4: 0
rsv
0x0B
(RW)
Default
Function Description
Remark
0-- signal channel ADC ADC signal
path Close Open 1--
0-- analog and RF analog and RF
channels open channel closed 1--
0000 measured using, do not change this value
Reg13: configure register 13 (default: 0x00) Addr
(Type)
BIT Label
Default Function Description
rsv
7
0
Measured using, do not change this value
0x0D
(RW)
Remark
0-tund pin is tuned lamp
6
st_led
0
5: 4
rsv
00
When 1-FM and non wtmode, tund indicator pin is stereo demodulation, tuning lamp
remainder
Measured using, do not change this value
Adjusting the output volume of the
entire values: 00: 0dB 01: 3.5dB
3: 2
vol_pre
00
10: 7dB 11: 10.5dB
1: 0
rsv
00
Measured using, do not change this value
Reg20: Read only register 0
Address (Type)
BIT
7
0x14
Label
Default
Function Description
Remark
1- 0 to the current situation other FM
st
stereo radio
(R)
Seek or Tune completion flag logic
6
0-Not complete
stc
1-Complete during Seek and Tune in the register
0.
5
tuned
When transferred to station 1, station search software can use this determination bit table
Current Channel No (high 5bit): FM
mode:
Channel Freq = 25kHz * READCHAN + 30MHz AM mode,
mode3k_f = 0: Channel Freq = 5kHz * READCHAN AM
4: 0 readchan [12:
8]
mode, mode3k_f = 1: Channel Freq = 3kHz * READCHAN
Reg21: Read only register 1
Address (Type)
BIT
0x15
Label
7: 0 readchan [7: 0]
Default
Function Description
Remark
Current Channel No (low 8bit):
(R)
Preliminary V2.3
Page 15 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
Reg22: Read only register 2
Address (Type)
BIT
Default
Function Description
Remark
" 1 " AM channel spacing No. 3K " 0 " AM
7 mode3k_f
0x16
(R)
Label
channel spacing No. 5K
6: 0 cnram
Carrier to noise ratio of the AM signal format, in dB
Reg23: Read only register 3
Address (Type)
BIT
7
0x17
(R)
Label
Default
Function Description
Remark
Only the demodulated FM stereo (Stereo ratio is greater than 30%) show only one
st_dem
6: 0 cnrfm
Carrier to noise ratio of the FM signal format, in dB
Reg24: Read only register 4
Address (Type)
BIT
Label
Default
Function Description
Remark
7: 5 pgalevel_rf
0x18
RF power control loop gain level, the greater the level, a high gain of approximately
4: 2 pgalevel_if
RF power control loop gain level, the greater the level, a high gain of approximately
(R)
1
rsv 0
lvmode
Low voltage maximum volume limit mode indication bit
Reg25: Read only register 5
Address (Type)
BIT
Label
Default
Function Description
Remark
7: 6 rsv 5: 0
0x19
(R)
6-bit unsigned number, indicating the supply voltage:
vbat
vcc_bat (V) = 1.8 + 0.05 * vbat [5: 0]
Reg26: Read only register 6
Address (Type)
BIT
Label
Default
Function Description
Remark
When the frequency offset indicated, complement format, greater than 127, 256 can be
0x1A
7: 0 fd_num
reduced to normal values, attention here to 1KHz units FM, AM in units of 100Hz
(R)
Reg27: Read only register 7
Address (Type)
BIT
7
Label
Function Description
Remark
rsv
0x1B
(R)
Default
Antenna aperture can be calculated using signal levels rssi, pgalevel_rf, pgalevel_if
6: 0 rssi
FM / SW: Pin (dBuV) = 103 - rssi - 6 * pgalevel_rf - 6 * pgalevel_if
MW / LW: Pin (dBuV) = 123 - rssi - 6 * pgalevel_rf - 6 * pgalevel_if
Preliminary V2.3
Page 16 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
8 Pin definitions
8.1 AKC6955 Pin definitions
Table 11. Pin Description
Pin name explanation
1
oscin
Bonding or passive 32.768K 12MHz crystal to ground, or receive an external clock reference signal
2
oscout
Passive other end connected to the crystal, when connected to an external clock, this pin floating
3
gnd
Close to ground
4
tund
5
p_on
On-chip power switch, high input power chip; the chip down in a low-power standby state, power consumption of approximately 10uA
6
sclk
I2C clock signal input
7
sdio
I2C bidirectional data signal input / output
8
inl
External audio signal input L, proposes to add blocking capacitor 1uF
9
inr
External audio input signal R, proposes to add blocking capacitor 1uF
10
vbat
Then the power pins need to pay attention to the nearest ground 0.1uF decoupling capacitance to ground
11
lout
Left channel audio output
12
gnd
Close to ground
13
rout
Right channel audio output
14
vref
Precision 1.5V output pin, to provide a baseline volume potentiometer
15
vol
16
vbat
Then the power pins need to pay attention to the nearest ground 0.1uF decoupling capacitance to ground
17
gnd
Close to ground
18
mwinN
19
mwinP
20
swin
Shortwave signal input terminal, note add blocking capacitor recommended 3nF
twenty one
gnd
Close to ground
twenty two
fmin
FM radio frequency signal input terminal, note add blocking capacitor, 100pF recommendations
twenty three
ldocap
Internal LDO output pin, nearest the need decoupling capacitors, recommendations 47uF
twenty four
gnd
Close to ground
Radio lock indicator pin, connected directly to the light emitting diode; Tuning the MCU software when the pin may also be used as a stop sign.
Variable volume potentiometer connected end, the fixed end of a potentiometer directly connected to VREF, and the other end through a resistor to ground.
The resistance ratio of the resistor and potentiometer as 1: 2
MW and LW differential input signal
Preliminary V2.3
Page 17 of 19
last update on 2012-11-1
Q-Technology Co., Ltd. (AKC technology limited)
9 Receiving TV sound
TV sound fundamental difference with the general FM stations that sound is an odd multiple of 50KHz. Here are a few national television with audio points:
Table 13. TV with audio point
National television channel 1
(MHz)
TV channel 2
TV Channel 3
TV Channel 4
TV Channel 5
TV Channel 6
(MHz)
(MHz)
(MHz)
(MHz)
(MHz)
Video audio video audio video audio video audio video audio video audio China 49.75 56.25 57.75 64.25 65.75 72.25 77.25
83.75
United States
55.25 59.75 61.25 65.75 67.25
Australia 57.25 62.75 64.25 69.75 86.25 91.75 95.25
new
85.25
91.75
168.25 174.75
71.75
77.25
81.75
83.25
100.75 102.25 107.75 175.25 180.75
45.25 50.75 55.25 60.75 62.25 67.75 175.25 180.75 182.25 187.75 189.25 194.75
Zealand
Indonesia 48.25 53.75 55.25 60.75 62.25 67.75 175.25 180.75 182.75 187.75 189.25 194.75 Italy
53.75 59.25 62.25 67.75 82.25 87.75 175.25 180.75 183.25 188.75 192.25 197.75
CCIR 41.25 46.75 48.25 53.75 55.25 60.75 62.25
Preliminary V2.3
67.75
Page 18 of 19
175.25 180.75 182.25 187.75
last update on 2012-11-1
87.75
Q-Technology Co., Ltd. (AKC technology limited)
10 TSSOP 24 Package
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
D
7.700
7.900
0.303
0.311
E
4.300
4.500
0.169
0.177
b
0.190
0.300
0.007
0.012
0.004
0.008
0.246
0.258
c
E1
0.090
0.200
6.250
6.550
A
1.
A2
0.800
A1
0.050
Preliminary V2.3
0.031
0.150
0.500
0.002
1
740
0.039
0.006
0.026 (BSC)
0.700
0
H
θ
1.000
0.65 (BSC)
e
L
0
002
0.020
0.028
0
2
PYT (5)
7°
Page 19 of 19
1
0
PYT (1)
7°
last update on 2012-11-1