HVDigitalPot2

High Voltage Digital Pot (10-bit)

Features

Most digital potentiometers are limited in the voltages that they can have at the end terminals to be within +5V and Ground. This makes operation with high voltages difficult. This design allows for higher voltages on the end terminals.

• Single-channel, 256-/1024-position resolution
• 20 kΩ, 50 kΩ, and 100 kΩ nominal resistance
• Maximum ±1% nominal resistor tolerance error (resistor performance mode)
• 20-times programmable wiper memory
• Rheostat mode temperature coefficient: 35 ppm/°C
• Voltage divider temperature coefficient: 5 ppm/°C
• +9 V to +33 V single-supply operation
• +9 V to -16.5 V dual-supply operation
• See data sheet for additional features

D/A Converter

ICs are Analog Devices part number AD5292 PDF Datasheet.

Connectors

J1 - 8 pin Header

1. +12V
2. GND
3. +5V
4. Din1
5. Din2
6. CLK
7. CSN
8. GND

J2/J3 - 3 pin Header

1. A side
2. Wiper
3. B side

Driver

Here is the 10-bit High Voltage Arduino Driver.

Accelerating Writes

Here are some notes on accelerating writes by using the SPI bus pins on the Arduino. Note that this card has a single chip select line and separate data lines which does not allow SPI transfers to be done. To do SPI there would need to be separate chip selects and a common data line.