50
9
Specifications
50
Sp
ecifications
Chapter
9
9-3.
Block diagram
+SIG
-SIG
Buffer
ADC
LCD
RAM
RTC
Non-volatility
memory
USB
interface
CPU
Backup
battery
Low-pass
filter
Power switch
Power supply
unit
External power supply
(+12V)
Built-in rechargeable battery
key
Operation
circuit
Charging