HVDigitalPot2

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Tindie-larges-v2.png

High Voltage Digital Pot (10-bit)

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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.