EMX-ESG User Manual Rev A.1
www.diamondsystems.com
Page 11
6.3 GPIO (J3)
A 26-pin connector provides 14 GPIO lines from the SCH3116, identified as ports A, B, and C. These lines have
3.3V logic levels with 5V input tolerance. The connector also provides access to the 1PPS signal from an optional
installed GPS module.
GP22
2
1
GP21
GP30
4
3
GP27
GP33
6
5
GP32
GP37
8
7
GP36
GP42
10
9
GP40
GP47
12
11
GP46
GP61
14
13
GP60
+3V3
16
15
1PPS
GND
18
17
+3V3
GND
20
19
GND
Connector description: JST ZPD series, SMT right angle; part no. SM20B-ZPDSS-TF
The GPIO lines come from the GPxx pins on SCH3116 chip and are mapped as the following:
SIGNAL
SCH3116
PIN#
GP21
37
GP22
38
GP27
36
GP30
110
GP32
39
GP33
40
GP36
41
GP37
42
GP40
3
GP42
90
GP46
32
GP47
33
GP60
94
GP61
93
