tps546

Async, no_std driver for the Texas Instruments TPS546D24A stackable PMBus buck converter, built on top of pmbus-adapter and embedded-hal-async.

Features

• Typed registers — configuration and status registers are parsed into Rust structs and enums, not raw bytes.
• Automatic voltage scaling — ULinear16 / Linear11 encoding and decoding is handled transparently; read and write voltages, currents, and temperatures as f32.
• Bulk telemetry — read_all() returns Vout, Iout, temperature, and Vin in a single I2C transaction.
• Manufacturer-specific commands — telemetry config, stack/sync config, NVM checksum, fault simulation, and more.
• no_std compatible — zero heap allocations, suitable for bare-metal and RTOS targets.

Usage

Add the crate to your Cargo.toml:

[dependencies]
tps546 = "0.1"

use tps546::{Tps546, DEFAULT_ADDR, Operation};
use pmbus_adapter::PmbusAdaptor;
use smbus_adapter::SmbusAdaptor;

async fn example<B: embedded_hal_async::i2c::I2c>(bus: B) {
    let smbus = SmbusAdaptor::new(bus);
    let pmbus = PmbusAdaptor::new(smbus);
    let mut dev = Tps546::new(pmbus, DEFAULT_ADDR);

    // Query VOUT_MODE and cache the exponent
    dev.init().await.unwrap();

    // Set output voltage to 1.0 V
    dev.set_vout_command(1.0).await.unwrap();

    // Turn on the output (bit 7 = ON)
    dev.set_operation(Operation::from_raw(0x80)).await.unwrap();

    // Read telemetry in one shot
    let t = dev.read_all().await.unwrap();
    let _vout = t.vout_f32(dev.vout_exponent());
    let _iout = t.iout_f32();
    let _temp = t.temperature_f32();
}

Minimum Supported Rust Version

This crate requires Rust 1.85.1 or later (edition 2024).

License

Licensed under either of

• Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.