USB-231-OEM User's Guide
Functional Details
10
Board components
Board components are shown in Figure 2.
1 Micro-USB connector
2 34-pin header connector (J2)
Figure 2. Board components
USB connector
The Micro-USB connector pr5 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
.
J2 differential pinout
Pin Signal name Pin description
Pin
Signal name
Pin description
1
AOUT0
Analog output 0
2
AOUT1
Analog output 1
3
AGND
Analog ground
4
AGND
Analog ground
5
CH3H
Analog input 3 HI
6
CH3L
Analog input 3 LO
7
CH2H
Analog input 2 HI
8
CH2L
Analog input 2 LO
9
CH1H
Analog input 1 HI
10
CH1L
Analog input 1 LO
11
CH0H
Analog input 0 HI
12
CH0L
Analog input 0 LO
13
AGND
Analog ground
14
AGND
Analog ground
15
D–
USB differential data signals
16
VBUS
USB power
17
D+
USB differential data signals
18
LED
Status LED driver
19
GND
Digital ground
20
DIO0
DIO bit 0
21
DIO1
DIO bit 1
22
DIO2
DIO bit 2
23
DIO3
DIO bit 3
24
DIO4
DIO bit 4
25
DIO5
DIO bit 5
26
DIO6
DIO bit 6
27
DIO7
DIO bit 7
28
NC
No connection
29
TRIG
Digital trigger input
30
NC
No connection
31
NC
No connection
32
GND
Digital ground
33
CTR
Counter input
34
+VO
User voltage output