Sony MEX-BT2500 Service Manual page 36

MEX-BT2500
• IC Pin Function Description
MAIN BOARD IC501 MB90F045PF-G-9044-SPE1 (SYSTEM CONTROLLER)
Pin No. Pin Name
AREASEL0 to
1 to 3
AREASEL2
4
B-OUT SEL
5 BEEP
6
NCO
7
DIAG
8
AMPSTB
9 VOLATT
10
NCO
11
VSS
12
TUATT
13
NSMASK
14 ILLUMI_SEL
15 to 22
NCO
23
VCC5
24
EEP_SIO
25 EEP_CKO
26
RDS_ON
27
LCD_CE
28
LCD_SO
29 LCD_CKO
30
NCO
31, 32
RE-IN0, RE-IN1
33
I2C_SCK
34 I2C_SIO
35
DAVDD
36
AVRH
37
DAVSS
38
QUALITY
39
VSM
KEYIN1,
40, 41
KEYIN0
42
VSS
43 to 46 NCO
47 BT_INT-HF
48
AD_ON
49 to 51
MD0 to MD2
52
KEY ACK
53 TUATTIN
54
BUIN
55
NCO
56
DAVN
57 NCO
36
I/O
I Model destination signal input terminal
I Blackout setting terminal "H": blackout effective
O Beep sound drive signal output to the power amplifier
- Not used
I Diagnostic signal input from the power amplifier
O Standby control signal output to the power amplifier
O Muting on/off control signal output to the electrical volume "H": muting on
- Not used
- Ground terminal
O Tuner muting on/off control signal output terminal
Discharge control signal output for the noise detection circuit
O
"H": discharge (AEP, UK models only)
I Illumination voltage setting terminal "L": 10.4V, "H": 12.5V Fixed at "L" in this set
- Not used
- Power supply terminal (+3.3V)
I/O Two-way data bus with the tuner unit
O Serial data transfer clock signal output to the tuner unit
O Power on/off control signal output terminal for the RDS section (AEP, UK models only)
O Chip enable signal output to the liquid crystal display driver
O Serial data output to the liquid crystal display driver
O Serial data transfer clock signal output to the liquid crystal display driver
- Not used
I Jog dial pulse input from the rotary encoder
O IIC data transfer clock signal output terminal
I/O IIC two-way data bus
- Power supply terminal (+3.3V)
I Reference voltage (+3.3V) input terminal (for A/D conversion)
- Ground terminal
I Noise level detection signal input at SEEK mode
I FM and AM signal-meter voltage detection signal input from the tuner unit (A/D input)
I Front panel key input terminal (A/D input)
- Ground terminal
- Not used
I
HF operation notification signal input from the bluetooth section "H": active
A/D converter power control signal output
O When the KEYACK (pin 52) that controls reference voltage power for key A/D conversion input
is active, "L" is output from this terminal to enable the input
I Setting terminal for the CPU operational mode
Acknowledge signal (wake up signal) input terminal for the key entry Acknowledge signal is
I
input to accept any function key in the standby status On at input of "H"
I Attenuate request signal input from the tuner unit
I Back up power supply detection signal input terminal "L" is input at low voltage
- Not used
I Synchronize detection signal input of RDS data block (AEP, UK models only)
- Not used
Description