HYT TC-610 Service Manual page 16

Detect of external PTT, MONI and VOX
Detect of PLL unlock (UL)
Detect of VOX ON level
Detect of battery power alarm
Detect of enabling and checking external remote speaker microphone
3. Data Transfer and Process
EEPROM data initiation
Programming data transfer
Encoding process of channel selector knob
Signalling encoding and decoding
Data transfer of baseband processing chip (PLL)
Power Supply Process
Block Diagram for the Circuit
7.2V
601s
L604
power management
After the radio is powered on, the battery voltage is provided to the RF power amplifier and audio
power amplifier to meet the requirements of sufficient power amplification after filtered by L604 and
C682. Another path is input with the regulator IC (U606) of 5V and outputs voltage of VCC_5V for
use by MCU and the baseband processing chip after regulated. Because the radio works under the
half duplex mode, it is required to control the Tx and Rx power supply alternately. To meet the
requirement of the battery save mode, MCU should output a pulse signal with fixed duty factor
5V
U606
Vin Vout
SW
V-TX
FMMT717
Q611
TXC
Figure 10
16
POWER-SAVE
FMMT717
Q610
Q612
UPA572T
SAVE