Hytera MD78X, Service Manual

Page: 459 / 519

VHF (136MHz
–
174MHz)
Interface Definition
43
Pin
No.
Signal Function
I/O of the
Radio
Voltage(Option
Board VDD=3.3 V)
Remark
1 GPIO1
GPIO
I/O
VIH MIN=0.7VDD
VIL MAX=0. 3VDD
VOH MIN=0.8VDD
VOL MAX=0.22VDD
GPIO5: Reset the
output signal of the
option board.
GPIO4/GPIO5:
Uni-directional
output
interfaces. They require
the input resistances to
be larger than or equal
to 47 kΩ.
3 GPIO2
5 GPIO3
7 GPIO4 O
9 GPIO5 RESET-OUT O
11 UART-TX
UART
O
UART.
13 UART-RX I
15 UART-CTS I
17 UART-RTS O
2 I2C –SDA
I2C
I/O
I2C.
4 I2C -SCL O
6 MCBSP-DR
MCBSP
I
McBSP: Multi-channel
Buffered Serial Port
8 MCBSP-WCLK I/O
10 MCBSP-DX O
12 MCBSP-FSX 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: 700mV.
18 AF MB TO OB AF O
80 mV (standard
output from the main
board to the option
board)
MAX: 700mV.
19 DGND DGND / / /