Hytera MD652, Service Manual

Page: 128 / 207

Circuit Description
VHF1 (136
‐
174 MHz)
20
Pin No. Signal Function
I/O of the
Radio
Voltage of
Option Board
VDD=3.3 V
Remarks
MAX=0.22VDD They require their
input resistances
are above or equal
to 47 kΩ.
11
13
15
17
UART-TX
UART-RX
UART-CTS
UART-RTS
UART
O
I
I
O
UART
2
4
I2C –SDA
I2C -SCL
I2C
I/O
O
I2C
6
8
10
12
MCBSP-DR
MCBSP-WCL
K
MCBSP-DX
MCBSP-FSX
MCBSP
I
I/O
O
I/O
McBSP:
Multichannel
Buffered Serial Port
14 AGND AGND / / /
16 AF OB TO MB AF I
80 mV (standard
output from the
option board to
the main board)
MAX: 700 mV
18 AF MB TO OB AF O
80 mV (standard
output from the
main board to the
option board)
MAX: 700 mV
19 DGND DGND / / /