Casio SF-5500B - To enter a mode; About display formats

— 13 —
Pin No. Name I/O Description
64,65 OSC I/O I/O Clock terminal
67,69~71 V1 ~ 4 Voltage for LCD drive
OFF: 0 V ON–V1: 0.64 Minimum ~ 1.29 Maximum V
V2: 1.29 Minimum ~ 2.56 Maximum V
V3: 3.99 Minimum ~ 2.71 Maximum V
V4: 4.64 Minimum ~ 3.99 Maximum V
68 NC - Not used
72 INTO In Low battery detection INTO < 5.2 V => No power on
73 STNT - GND 0 V
74 VLCD In Power supply terminal (+5.3 V)
S0 ~ 95 Out Segment signal for display
C5 ~ 32 Out Common signal for display
168,200 NC - Not used
172 ~199
75 ~ 171
6-2. VOLTAGE REGULATOR: REG1 (S-81253)
Output Voltage (VDD): 5.3 V ± 5%
1
GND
2
VCC
3
VDD
VDD
GND
VCC
V
REF
RA
RB
1
2
3
RI
+
–
Input Voltage (VCC) Output Voltage (OUT)
VCC > 5.2 V 5.2 V
VCC < 5.2 V 0 V
3
GND
1
OUT
2
VCC
1
2
3
VCC
OUT
GND
6-3. VOLTAGE DETECTOR: DET1 (RH5VL46CA)