Service manual

UX-B20U/UX-B20C/B25C
5 – 12
µPD65945 (IC4) Pin descriptions
SYMBOL PIN NO. I/O DESCRIPTION PAD CELL. NOTE
Sensor Signals (2 pin)
POS 124 I Home position Sensor Input
L: No Position
H: Home Position
FIS1 Schmitt
PIN_N 47 I Paper-in Sensor Input
L: Paper Exist
H: No Paper
FIS1 Schmitt
SYMBOL PIN NO. I/O DESCRIPTION PAD CELL. NOTE
Test Pins (10 pin)
SCK 136 I Scan clock -
AMC 138 I -
SMC 135 I Scan mode control -
SIN 137 I Scan in FDS1
SOT 139 O Scan out FO09
TM0 51 I Test mode select
LLL: Normal operation
Else: Test/Debug operations
FDS1 Schmitt+Pull Down
TM1 52 I FDS1 Schmitt+Pull Down
TM2 53 I FDS1 Schmitt+Pull Down
TEST 50 I Test mode enable
L: Normal operation
H: Test mode
FDS1 Schmitt+Pull Down
DEBUG 54 O Debug output FO09
SYMBOL PIN NO. I/O DESCRIPTION PAD CELL. NOTE
Power/Ground Pins (55 pin)
VDD 1,10,25,
36,56,57,
73,76,79,
80,86,87,
98,108,
121,134
- Power +3.3V -
GND 11,20,21,
23,24,37,
3845,46,
48,49,55,
58,59,62,
63,69,71,
72,77,78,
81,82,84,
85,96,97,
105,109,
110,115,
116,122,
123,131,
132,143,
144
- Ground -
SYMBOL PIN NO. I/O DESCRIPTION PAD CELL. NOTE
Serial Data Interface (3 pin)
PCLK 64 I Serial clock FIS1 Schmitt
PDAT 65 I Serial data
L: White Dot
H: Black Dot
FIS1 Schmitt
PLAT 66 I Serial data latch strobe
(Negative Pulse)
FIS1 Schmitt