Casio A-10 - Detector Circuit

— 38 —
DETECTOR CIRCUIT
The detector circuit consistes of 4 blocks as follows;
1 : Primary detector (Alkaline and NiMH)
2 : Secondary detector (Alkaline and NiMH)
3 : Backup battery detector
4 : AC Adaptor detector
PRIMARY DETECTOR
NiMH Detector
Alkaline Detector
V3SYS
VBAT2
VDET1RB (L=Low battery message)
VDET2R (H=Forced power off)
VDET1B (L=Low battery message)
VDET2 (H=Forced power off)
U17(2.3V)
U16(1.9V)
U12(2.0V)
U13(1.6V)
SECONDARY DETECTOR
VDET3B (L=Forced power off)
V5MAIN
V3MAIN
Alkalin & NiMH Detector
U14 (3.4V)
Alkalin & NiMH Detector
U32 (4.5V)
OR circuit (Tr)
BACKUP BATTERY DETECTOR
VSUB
VDETS (H=Low battery message)
U15 (2.7V)
AC ADAPTOR DETECTOR
ACDTCTB(L=Adaptor used)
Q18
RBATMAIN
From RS232C Connector