Panasonic KX-FP342BX Service Manual page 124

KX-FP342BX
NO.
123 RM3/IOP
124 RXE/IOP
125 TMO
126 VDD (2.5V)
127 VSS
128 TM1/IOP
129 TM2/IOP
130 TM3/IOP
131 TXE/IOP
132 KSTART
133 KLATCH
134 KSCLK
135 KTXD
136 KRXD
137 FMEMCLK/IOP
138 FMEMDI/IOP
139 ADSEL1
140 VDDA (2.5V)
141 VREFB
142 VCL
143 VREFT
144 VSSA
7.3.6. RESET CIRCUIT (WATCH DOG TIMER)
The output signal (reset) from pin 4 of the voltage detect IC (IC507) is input to the ASIC (IC501) 114 and 106 pins.
1. During a momentary power interruption, a positive reset pulse of 50~70 msec is generated and the system is reset completely.
2. The watch dog timer, built-in the ASIC (IC501), is initialized by the CPU about every 1.5 ms.
When a watch dog error occurs, pin 115 of the ASIC (IC501) becomes low level.
The terminal of the ´WDERR´ signal is connected to the reset line, so the ´WDERR´ signal works as the reset signal.
SIGNAL I/O
O
O
O
O
O
O
O
O
O
O
O
I
O
O
O
A
A
A
POWER SUPPLIED
VOLTAGE
3.3V RX MOTOR /B PHASE
3.3V RX MOTOR ENABLE SIGNAL
3.3V TX MOTOR A PHASE
3.3V POWER SOURCE (+2.5V)
GND POWER SOURCE (GND)
3.3V TX MOTOR B PHASE
3.3V TX MOTOR /A PHASE
3.3V TX MOTOR /B PHASE
3.3V TX MOTOR ENABLE SIGNAL
3.3V OPERATION PANEL CONTROL
3.3V OPERATION PANEL CONTROL
3.3V OPERATION PANEL CONTROL
3.3V OPERATION PANEL CONTROL
3.3V OPERATION PANEL CONTROL
3.3V OUTPUT PORT (THON)
3.3V OUTPUT PORT (LINERLY)
3.3V CHANNEL SELECT SIGNAL FOR AIN2
3.3V POWER SOURCE (ANALOG +2.5V)
2.5V A/D CONVERTER´S ZERO STANDARD VOLTAGE
OUTPUT
3.3V ANALOG PART STANDARD VOLTAGE SIGNAL
3.3V A/D CONVERTER´S
OUTPUT
GND POWER SOURCE (ANALOG GND)
124
DESCRIPTION
FULL SCALE VOLTAGE