Getting Started
1.4.2
Connecting a 6-Wire Load Cell to the Terminal Block
shows the connection of a 6-wire load cell to the terminal block. In this configuration, the load cell
is excited by the +5V power supply, and the ADC’s reference is taken from the sense wire returning from
the load cell. The sense wire connects to the excitation wire at the bridge sensor.
OUT-
SENSE+
EXC+
EXC-
SNS-
SNS+
SIG+
SIG-
EXC+
OUT+
EXC-
SENSE-
Figure 3. 6-Wire Load Cell to Terminal Block
1.4.3
Connecting a 4-Wire Load Cell to the Header
shows the connection of a 4-wire load cell to the header. In this configuration, the load cell is
excited by the +5V power supply, and the ADC reference is taken from the power supply.
EXC+
OUT-
OUT+
EXC-
6
5
4
3
2
1
Figure 4. 4-Wire Load Cell to Header
For this configuration, the reference select switch must be in the +5VA position; the EXT position does not
work.
1.4.4
Connecting a 6-Wire Load Cell to the Header
shows the connection of a 6-wire load cell to the header. In this configuration, the load cell is
excited by the +5V power supply, and the ADC reference is taken from the sense wire returning from the
load cell. The sense wire connects to the excitation wire at the bridge sensor.
EXC+
SENSE+
OUT+
OUT-
SENSE-
EXC-
6
5
4
3
2
1
Figure 5. 6-Wire Load Cell to Header
For this configuration, the reference select switch should be in the EXT position for best performance. The
+5V position also works, but the device may not perform as well.
SBAU175A
–
July 2010
–
Revised August 2011
ADS1131REF and ADS1231REF
5
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2010–2011, Texas Instruments Incorporated
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