Sony SPP-935 Service Manual page 31

• HAND MAIN BOARD U3 LSC433400FB (SYSTEM CONTROLLER)
Pin No. Pin Name
1 RX ENABLE
2 LO BAT
3 OPEN
4 to 7 COL0 to COL3
8 IRQ/ROW0
9 to 13 ROW1 to ROW5
14 CRADLE DET
15 TX ENABLE
16 OPEN
17 VSS
18 RINGER
19 PLL EN
20 ATE IO
21 TX MUTE
22 OPEN
23 RX MUTE
24 INT COM LED
25 IN USE LED
26 BATT LOW LED
27 RDI
28 TDO
29 MISO
30 PLL DATA
31 PLL CLK
32 SS
33 TX DATA
34 RX DATA
35 TCAP
36 OSC2
37 OSC1
38 VDD
39, 40 OPEN
41 RESET
42 IRQ/ROW0
43 VPP
44 OPEN
I/O
O RX system power supply on/off control signal output "L": power on
I Battery level detect signal input from the LP2953IM (U11) "L": battery low level
O Not used (open)
O Key scan signal output to the key matrix
I Key return signal input from the key matrix
I Key return signal input from the key matrix
I Detect signal input of the handset unit on cradle or off cradle "L": on cradle, "H": off cradle
O TX system power supply on/off control signal output "L": power on
O Not used (open)
— Ground terminal
O Ringer drive signal output terminal Normally: "L"
Chip enable signal output to the TB31202FN (U2)
O
When PLL EN goes from "L" to "H", it load data from PLL DATA
I/O Communication in/out terminal with system controller (U3) on the base unit Normally: "L"
O TX muting control signal output to the TA31103F (U7) "L": muting on
O Not used (open)
O RX muting control signal output to the TA31103F (U7) "L": muting on
O INT COM LED drive signal output terminal "L": LED on
O IN USE LED drive signal output terminal "L": LED on
O BATT LOW LED drive signal output terminal "L": LED on
I Not used (fixed at "L")
I Not used (fixed at "L")
I Not used (fixed at "L")
O Serial data output to the TB31202FN (U2)
O Serial data transfer clock signal output to the TB31202FN (U2)
I Slave selection input terminal Fixed at "H" in this set
O Transmit data output terminal
I Receive data input terminal
I Not used (fixed at "L")
I System clock input terminal (4 MHz)
I System clock input terminal (4 MHz)
— Power supply terminal (+5V)
O Not used (open)
System reset signal input from the reset signal generator (U11) "L": reset
I
For several hundreds msec. after the power supply rises, "L" is input, then it changes to "H"
I External interrupt input terminal
— Connected to power supply line (+5V)
O Not used (open)
Function
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