Semiconductor Data - HYT TC-610 Service Manual

When the remote speaker microphone with VOX is inserted into the earpiece jack, Q201 cuts off.
MIC_EN switches from low level to high level and Q202 completes the circuit with R204 and the
external remote speaker microphone simultaneously. Q202 becomes conductive. EXT-PTT
switches from low level to high level, which is detected by MCU as insert of a remote speaker
microphone with VOX. The VOX function is enabled. When the VOX detect level (5 levels available)
meets the preset requirements, the radio transmits and the audio signal goes to the baseband
processing IC AN29160 through the processing path.
If a remote speaker microphone without VOX (remote speaker microphone with PTT) is inserted,
Q201 cuts off. MIC_EN switches from low level to high level but Q202 can not complete the circuit
and keep the cut-off status. EXT-PTT is of low level. MCU detects as the remote speaker
microphone without VOX and the radio returns to the common mode. Press the PTT key on the
remote speaker microphone to transmit.

Semiconductor Data

Pin
Pin Name
No.
1 AVcc
2 AVR
3 PE3/INT13
4 PE2/INT12
5 PE1/INT11
6 PE0/INT10
7 P83
8 P82
9 P81
10 P80
11 P71/TI0
12 P70/TO0
13 MOD
TC-610 TC-620
Vcc Vcc
Vcc Vcc
PTT PTT
A_KEY A_KEY
EXT-PTT EXT-PTT
B_KEY B_KEY
ENC3 ENC3
ENC2 ENC2
ENC1 ENC1
ENC0 ENC0
T/R T/R
Reserve Reserve
For down For down
-loading -loading
I/
Description
O
Power supply pin for A/D, connecting power
supply
A/D reference input pin, connecting power
supply
PTT key (connected with pull-up resistor ) (valid
I
at low level)
SK1, programmable function key (connected
I
with pull-up resistor ) (valid at low level)
PTT key on the earpiece (connected with
I
pull-down resistor) (valid at high level)
SK2, programmable function key (connected
I
with pull-up resistor ) (valid at low level)
I
Encoder input of channel selector
I
knob(connected with pull-up resistor )
I
I
O Tx-Rx switch control H(R)/L(T)
O Reserved
An operating mode designation pin. When
I downloading, this pin is connected with Vcc and
a resistor of 47K is also connected between the
18