1 Channel Potentiometer Out (OWPOT1)

Description:

This 1-wire card uses the DS2890 IC which has one programmable linear taper potentiometer which supports voltages up to 11 volts. You may use this module to generate output (D-A) control voltages.

Card Type: 129

Connector CN2 (5-pin style) Pinout

Pin Numbers	Description
1	Common
2	Potentiometer Common (Must connect pin 2 to pin 1)
3	Potentiometer wiper
4	Potentiometer High (can connect pin 4 to pin 5 or connect to any voltage up to 11 V with respect to Common)
5	+5V Power Output

Connector CN2 (6-pin style) Pinout:

Pin Numbers	Description
1	Common
2	No Connection
3	Potentiometer High (can connect pin 3 to pin 6 or connect to any voltage up to 11 V with respect to Common)
4	Potentiometer wiper
5	Potentiometer Common (Must connect pin 5 to pin 1)
6	+5V Power Output

OWconfig:

The "Type" must be 129 as described above. The "Mode" must always be "Separate power".

Modbus Register Information:

This device has one Modbus output register on the ICONIO board used to set the potentiometer wiper position. The register value range is 0 to 255.

Specifications:
 

Parameter	Specification
Temperature	-40 to +85C (-40 to +185F)
Potentiometer Low	Must be tied to Common
Potentiometer High	Up to 11V with respect to Common. Can also connect to +5V power output.
Register Range	0 to 255 (Sets the wiper in 256 steps)
Resistance Value	100K ohms
Resistance Tolerance	+/-25%

Schematic and Parts List:
 

Reference	Part Number
CN1	Digikey 281-1451-ND
CN2	Digikey 281-1452-ND
D1	Dallas Semi DS9503P
D2, D4	Digikey SA5V0ADICT-ND
U1	Dallas Semi DS2890P-000