# DRV8424PWPR

**Texas Instruments** · Stepper Motor Driver · HTSSOP-28-EP

DRV8424PWPR from Texas Instruments, in a HTSSOP-28-EP. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCP | passive | Charge pump output; connect 0.22µF 16V ceramic capacitor to VM. |
| 2 | VM | power_in | Motor power supply input, 4.5 to 33V operating range; bypass with two 0.01µF and one bulk ceramic capacitor to PGND. |
| 3 | PGND | power_in | Power ground; connect to system ground. |
| 4 | AOUT1 | output | Motor winding A output, up to 4A peak current; connect to stepper motor winding. |
| 5 | AOUT1 | output | Motor winding A output, up to 4A peak current; connect to stepper motor winding. |
| 6 | AOUT2 | output | Motor winding A output, up to 4A peak current; connect to stepper motor winding. |
| 7 | AOUT2 | output | Motor winding A output, up to 4A peak current; connect to stepper motor winding. |
| 8 | BOUT2 | output | Motor winding B output, up to 4A peak current; connect to stepper motor winding. |
| 9 | BOUT2 | output | Motor winding B output, up to 4A peak current; connect to stepper motor winding. |
| 10 | BOUT1 | output | Motor winding B output, up to 4A peak current; connect to stepper motor winding. |
| 11 | BOUT1 | output | Motor winding B output, up to 4A peak current; connect to stepper motor winding. |
| 12 | PGND | power_in | Power ground; connect to system ground. |
| 13 | VM | power_in | Motor power supply input, 4.5 to 33V operating range; bypass with two 0.01µF and one bulk ceramic capacitor to PGND. |
| 14 | GND | power_in | Device logic ground; connect to system ground. |
| 15 | DVDD | power_out | Internal regulated 5V logic supply output, maximum 2mA load; bypass with 0.47-1µF capacitor to GND. |
| 16 | nFAULT | tri_state | Fault indicator open-drain output, pulled low on fault condition; requires external pull-up resistor. |
| 17 | VREF | power_in | Current reference input, 0.05 to 3.3V (DRV8424); sets full-scale motor current by ITRIP = VREF/1.32. |
| 18 | M0 | input | Microstepping mode select input with internal pull-down; configure with M1 for step mode 1/1 to 1/256. |
| 19 | TOFF | input | PWM off-time four-level input; selects 7µs, 16µs, 24µs, or 32µs chopping time. |
| 20 | DECAY1 | input | Decay mode select input; configure with DECAY0 for slow, mixed, or smart decay modes. |
| 21 | DECAY0 | input | Decay mode select input; configure with DECAY1 for slow, mixed, or smart decay modes. |
| 22 | M1 | input | Microstepping mode select input with internal pull-down; configure with M0 for step mode 1/1 to 1/256. |
| 23 | STEP | input | Step pulse input, rising edge advances stepper one microstep; accepts up to 500kHz with internal pull-down. |
| 24 | DIR | input | Direction control input; logic level selects forward or reverse motor rotation with internal pull-down. |
| 25 | ENABLE | input | Device enable control input; logic low disables outputs, logic high enables, with internal pull-up to DVDD. |
| 26 | nSLEEP | input | Sleep mode control input; logic high enables device, logic low enters 2µA sleep mode with internal pull-down. |
| 27 | CPL | passive | Charge pump switching node low side; connect 0.022µF ceramic capacitor to CPH. |
| 28 | CPH | passive | Charge pump switching node high side; connect 0.022µF ceramic capacitor to CPL. |
| 29 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | HTSSOP-28-EP |
| Category | Motor Driver ICs |
| Pins | 29 |

## CAD (KiCad official)

- Symbol: `DRV8424PWPR`
- Footprint: `Package_SO:TSSOP-28-1EP_4.4x9.7mm_P0.65mm_EP2.85x6.7mm`
- 3D model: HTSSOP-28-EP (KiCad packages3D, STEP)
- 3D model files: `drv8424pwpr-etched.step` / `drv8424pwpr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `drv8424pwpr.step` / `drv8424pwpr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/drv8425) (56 pp, sha256 `d2894da743bf3f58`, retrieved 2026-09-24, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.2`, primary `claude-haiku-4-5-20251001` (text), consensus `claude-sonnet-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/drv8424pwpr-datasheet.pdf)