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HardFOC driver

ADS7952 Driver

A C++20 driver for the Texas Instruments ADS7952 12-channel, 12-bit, 1 MSPS SAR ADC. It reads one channel or a whole sequence, programs per-channel alarms and the four GPIOs, and converts counts to volts, on any MCU with SPI.

Quickstart API guide Source on GitHub

The driver has no platform code. You give it a small class that moves bytes over SPI; it does the rest: the 16-bit command words, the two-frame result pipeline, the power-up discard, sequence and alarm programming and the conversion to volts.

12-channel, 12-bit, 1 MSPS SAR ADC ADS7952 Texas Instruments
Inputs
12 single-ended channels through one multiplexer (MXO, wired to AINP)
Interface
SPI mode 0 up to 20 MHz, 16-bit frames, MSB first
Input range
0 to VREF, or 0 to 2 × VREF while 2 × VREF ≤ +VA; external VREF 2.0 V to 3.0 V
Supply
+VA 2.7 V to 5.25 V (analog), +VBD 1.7 V to +VA (digital I/O)
Extras
Manual, Auto-1 and Auto-2 sequencing; high and low alarm per channel; 4 GPIOs (TSSOP)
Package
38-pin TSSOP (DBT) or 32-pin VQFN (RHB, one GPIO); −40 °C to 125 °C

Datasheet (SLAS605C) · Product page

What you get

  • One object per chip. ADS7952<YourSpi> reads channels, switches modes and programs sequences, alarms and GPIOs. See API guide.
  • Results matched to their channel. Every reply carries the 4-bit address of the channel it belongs to; the driver keys on it instead of counting frames. See Modes and the frame pipeline.
  • Volts in and out. Counts convert with the reference and range you run, and alarm thresholds take volts. See Configuration.
  • Zero-overhead portability. The port is a CRTP class with one method: no virtual calls, no heap, no RTOS dependency. See Porting.
  • Tested without hardware. Host unit tests run the driver against a model of the chip's SPI pipeline. See Testing and CI.

Where to go next

  • Quickstart

    Wire the chip, write the port, read every channel in about 15 lines.

  • Hardware

    Pins, bus settings, timing, reference and supply ranges.

  • Architecture

    The three layers and what each one owns.

  • API guide

    Configure, read, program alarms and GPIOs, handle errors, task by task.

  • Porting

    Implement the SPI interface for your MCU.

  • API reference

    Every class and member, generated from the headers.