Commell HE-B71, User Manual

Page: 30 / 46

HE-B71 User’s Manual
-24-
2.13 <GPIO and SMBUS Interface>
The board provides a programmable 8-bit digital I/O interface; you can use this general
purpose I/O port for system control like POS or KIOSK. The GPIO is an Open-drain
output and TTL-level input .
1. Output
：
Open-drain , Most applications need use an external pull-up resistor .
2. Input
：
TTL-level.
DC characteristics:
Parmeter SYM MIN TYP MAX UNIT Conditions
Input Low Voltage V
IL
0.8 V
Input High Voltage V
IH
2.0 V
Output Low Voltage V
OL
0.4 V I
OL
=12mA
Input High Leakage I
LIH
+10
μ
A V
IN
=3.3V
Input Low Leakage I
LIL
-10
μ
A V
IN
=0V
Connector: CN_DIO
Type: 12-pin (6 x 2) header (pitch = 2.0mm)
Pin Description Pin Description
1 Ground 2 Ground
3 GPIO1 4 GPIO5
5 GPIO2 6 GPIO6
7 GPIO3 8 GPIO7
9 GPIO4 10 GPIO8
11 5V 12 12V
Connector: CN_SMBUS
Type: 5-pin header for SMBUS Ports
Pin Description
1 VCC
2 N/C
3 SMBDATA
4 SMBCLK
5 Ground
CN_SMBUS
1 5
2
1
CN_DIO
12
11