Board Components; Usb Connector; Header Connector J2 - Measurement Computing USB-231-OEM User Manual

USB-231-OEM User's Guide

Board components

Board components are shown in Figure 2.

USB connector

The Micro-USB connector provides +5 V power and communication. No external power supply is required.
When using the USB connector to connect to the USB host, leave the D+ and D- signals and VBUS on the 34-
pin connector disconnected.

Header connector J2

The 34-pin header connector provides the connections listed in the following pinout tables.
Caution! To ensure the specified EMC performance, the length of any wire or cable connected to the header
connector must be no longer than 0.5 m (20 in.).
Differential mode pinout
Do not connect to connector pins labeled NC.
Pin Signal name
1 AOUT0
3 AGND
5 CH3H
7 CH2H
9 CH1H
11 CH0H
13 AGND
15 D–
17 D+
19 GND
21 DIO1
23 DIO3
25 DIO5
27 DIO7
29 TRIG
31 NC
33 CTR
1 Micro-USB connector
Figure 2. Board components
J2 differential pinout
Pin description
Analog output 0
Analog ground
Analog input 3 HI
Analog input 2 HI
Analog input 1 HI
Analog input 0 HI
Analog ground
USB differential data signals
USB differential data signals
Digital ground
DIO bit 1
DIO bit 3
DIO bit 5
DIO bit 7
Digital trigger input
No connection
Counter input
2 34-pin header connector (J2)
Pin Signal name
2 AOUT1
4 AGND
6 CH3L
8 CH2L
10 CH1L
12 CH0L
14 AGND
16 VBUS
18 LED
20 DIO0
22 DIO2
24 DIO4
26 DIO6
28 NC
30 NC
32 GND
34 +VO
10
Functional Details
Pin description
Analog output 1
Analog ground
Analog input 3 LO
Analog input 2 LO
Analog input 1 LO
Analog input 0 LO
Analog ground
USB power
Status LED driver
DIO bit 0
DIO bit 2
DIO bit 4
DIO bit 6
No connection
No connection
Digital ground
User voltage output