39
SPP-A2770
6-14.
IC PIN FUNCTION DESCRIPTION
•
BASE MAIN BOARD IC301 SB875064W-5W61 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Description
1
SS SPI CLK
O
Serial data transfer clock signal output to the RF unit (RF271)
2
LCD SDA
O
Two-way data bus with the liquid crystal display module Not used (open)
3
LCD CS
O
Chip select signal output to the liquid crystal display module “L” active Not used (open)
4
LCD SCL
O
Serial data transfer clock signal output to the liquid crystal display module Not used (open)
5
HOOK SW DET
I
Hook on/off detection signal input “H”: hook on, “L”: hook off
6
OFF HOOK CONT
O
Hook on/off control signal output “L”: hook off, “H”: hook on
7
PWM1
O
Not used (open)
8
LED CONT
(LCD)
O
LED drive signal output of the liquid crystal display module back light
“L”: LED on Not used (open)
9
VDD2
—
Power supply terminal (+5V)
10
VSS2
—
Ground terminal
11
FLASH WRITE
SELECT
I
Not used (fixed at “H”)
12
JOG PUSH
I
PUSH ENTER switch (S701) input terminal “L” input when key pressing
Not used (open)
13 to 18 ROW1 to ROW6
I
Key data input to the key matrix “L” input when key pressing
19
LCD RS
O
Reset signal output to the liquid crystal display module Not used (open)
20, 21
COL1, COL2
O
Key scan output to the key matrix “L” output when key waiting
22
JOG A
I
Jog dial pulse input of the rotary encoder (A phase input) Not used (open)
23
JOG B
I
Jog dial pulse input of the rotary encoder (B phase input) Not used (open)
24 to 26
COL3 to COL5
O
Key scan output to the key matrix “L” output when key waiting
27
DSP SC
O
Serial data transfer clock signal output to the DSP (IC402)
28
DSP HRNW
O
Data read/write selection signal output to the DSP (IC402) “L”: data write, “H”: data read
29
DSP CSN
O
Chip select signal output to the DSP (IC402) “L” active
30
DSP ACKN
I
Acknowledge signal input from the DSP (IC402) “L” active
31
DSP SDO
O
Serial data output to the DSP (IC402)
32
DSP SDI
I
Serial data input from the DSP (IC402)
33
DSP PWR DOWN
O
Power down control signal output to the DSP (IC402) “L”: power down
34
DSP RESET
O
Reset signal output to the DSP (IC402) “L”: reset
35
VSS3
—
Ground terminal
36
VDD3
—
Power supply terminal (+5V)
37
E2PROM SCL
O
Serial data transfer clock signal output to the EEPROM (IC303)
38
E2PROM SDA
I/O
Two-way data bus with the EEPROM (IC303)
39
PC5
I
Not used (open)
40
LED (IN USE)
O
LED drive signal output of the IN USE indicator (D704) “L”: LED on
41
PC3
O
Not used (open)
42
ANTENNA
SELECT B
O
Main antenna on/off control signal output “L”: antenna on
43
ANTENNA
SELECT A
O
Sub antenna on/off control signal output “L”: antenna on
44
PC0
O
Not used (open)
45
SS PWR DOWN
CONT
O
Power down control signal output to the RF unit (RF271) “H”: power down
46
SS RESET
O
Reset signal output to the RF unit (RF271) “L”: reset
47
SS SPI EN
O
Enable signal output to the RF unit (RF271) “L” active
48
LED (ANS)
O
LED drive signal output of the ANSWER ON/OFF indicator (D705) “L”: LED on
Summary of Contents for SPP-A2770 - 2.4ghz Cordless Telephone
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