Hytera MD78X - Page 52

UHF1 (400
–
470 MHz)
Interface Definition
45
Pin No. Signal Function
I/O of the
Radio
Voltage
(Option Board
VDD=3.3 V)
Remark
5 GPIO3
VOH MIN=0.8VDD
VOL MAX=0.22VDD
board.
GPIO4/GPIO5:
Unidirectional output
interfaces. They require
their input resistances
are greater than or
equal to 47 kΩ.
7 GPIO4 O
9 GPIO5 RESET-OUT O
11 UART-TX
UART
O
UART
13 UART-RX I
15
UART-CT
S
I
17
UART-RT
S
O
2 I2C –SDA
I2C
I/O
I2C
4 I2C -SCL O
6
MCBSP-D
R
MCBSP
I
McBSP: Multi-channel
buffered serial port
8
MCBSP-W
CLK
I/O
10
MCBSP-D
X
O
12
MCBSP-F
SX
I/O
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