Icom ID-31A

4 - 5
• D/A CONVERTER (MAIN UNIT: IC11)
BALL
No.
LINE
NAME
DESCRIPTION I/O
N4 DSP_SI DSP (IC10) serial data. I
N5
DSP_
AFC1
DSP (IC10) “AFC” input. I
N6
RTC_
SDA
Serial data to the real time clock (IC4). I/O
N7 PLLSTB PLL IC (MAIN UNIT: IC6) strobe. O
N9 LCDDT LCD (DS10) serial data. O
N10
DSP_
DEMP
DSP (IC18) “DATA EMP” input. I
N12 G_HIB
GPS module (CHASSIS: EP1) controller
(IC1) power control.
H: GPS module is ON.
O
N15 ECK EEPROM (IC7) clock. O
P1 SD_CS MicroSD card chip select. O
P2 SD_SCK MicroSD card clock output. O
P4 DSP_CK DSP (IC18) clock. O
P5 DSP_PD
DSP (IC18) operating mode control.
H: While in the power save mode.
O
P6 LCDRES LCD (DS10) reset. O
P7 PLLDATA PLL IC (MAIN UNIT: IC6) serial data. O
P9 PLL SW
PLL lockup time control.
L: Fast lockup time.
O
P12 GPSC
GPS module (CHASSIS: EP1) controller
(IC1) switching.
H: GPS module’s power is ON.
O
P13 RX232 RS-232C serial data input. I
P14 INTPTT
Internal PTT (MAIN UNIT: S2) input.
L: Pushed.
I
R1 SD_RXD MicroSD card card data input. I
R2 DSP_SO DSP (CI18) serial data. O
R4
DSP_
AFC2
DSP (IC18) “AFC” input. I
R5
DSP_
RESET
DSP (IC18) reset.
H: Reset.
O
R6
RTC_
SCL
Clock signal to the real time clock IC
(IC4).
O
R7 PLLCK PLL IC (MAIN UNIT: IC6) clock. O
R8 LCDCK LCD (DS10) clock. O
R13 AFON
AF power AMP (MAIN UNIT: IC2) control.
L: AF power AMP activated.
O
R14 EXTPTT External PTT input. I
• CPU (LOGIC UNIT: IC5) (Continued)
PIN
No.
LINE
NAME
DESCRIPTION I/O
7 BPF1
Tuning voltage to the BPF (D32, L40,
C353).
O
8 BPF3
Tuning voltage to the BPF (D27, D29, D30,
L28, L31, L33, C286, C290, C292, C293,
C297, C299–C301, C304, C305).
O
11 SQLOUT Noise squelch level adjustment. O
12 RXAFOUT RX AF output level adjustment. O
19 VCOMOD
VCO (Q27
, D10–D12) deviation adjust-
ment.
O
20 REFMOD
Reference oscillator (X1) deviation adjust-
ment.
O
24 BPF2
Tuning voltage to the BPF (D27, D29, D30,
L28, L31, L33, C286, C290, C292, C293,
C297, C299–C301, C304, C305).
O