Icom ID-31A

2 - 2
• LOGIC UNIT
(BOTTOM VIEW)
CODEC
(IC15)
SERIAL FLASH MEMORY
(IC20)
EEPROM (For the CPU)
(IC7)
CPU
(IC5)
REAL TIME CLOCK IC
(IC4)
DUAL STEP-DOWN COVERTER
(IC10)
MicroSD CARD SLOT
(J3)
GPS MODULE CONTROLLER
(IC1)
DATA LEVEL CONVERTER
(IC21)
EEPROM (For GPS data)
(IC3)
SERIAL DATA INTERFACE
(IC2)
CPU RESET IC
(IC22)
AF SW
(IC16)
MIC GAIN SW
(Q18)
DSP
(IC18)
CLOCK OSCILLATOR
(For the DSP)
(X3)
CLOCK BUFFER
(For the CODEC)
(IC17)
AF FILTER
(IC13)
CLOCK OSCILLATOR
(For the real time clock IC)
(X1)
AF FILTER
(IC12)
ALC IC
(IC14)
DUAL INVERTER GATE
(IC8)
+3.3 V REGULATOR
(IC9)
CLOCK OSCILLATOR (For the CPU)
(X2)