DRV8825

@@ -0,0 +1,73 @@+# DRV8825++**Texas Instruments** · Bipolar stepper motor driver · HTSSOP-28++A microstepping bipolar stepper driver in HTSSOP-28, the higher-spec sibling of the A4988 on 3D-printer and CNC boards. Its integrated indexer runs a motor from just STEP and DIR pulses (no phase tables), and three mode pins select full down to 1/32 microstepping (finer than the A4988's 1/16). Two N-channel bridges deliver up to 2.5 A per coil from an 8.2 to 45 V supply (higher than the A4988), with a simple current-limit set by VREF and sense resistors, an internal 3.3 V reference output, and full protection: over-current, over-temperature, and under-voltage lockout. It is pin-and-module compatible with the A4988 footprint used on stepstick boards. The 3D model shown is a representative TSSOP-28 body; the real package is HTSSOP-28 with a thermal pad.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | CP1 | passive | Charge pump flying capacitor terminal 1. Connect a 0.01-uF 50-V ceramic capacitor between CP1 and CP2. |+| 2 | CP2 | passive | Charge pump flying capacitor terminal 2. Connect a 0.01-uF 50-V ceramic capacitor between CP1 and CP2. |+| 3 | VCP | power_out | High-side gate drive voltage (charge pump output). Connect a 0.1-uF 16-V ceramic capacitor to VM and a 1-MOhm resistor to VM. |+| 4 | VMA | power_in | Bridge A power supply (8.2 to 45 V). Must be tied to the same supply as VMB; bypass with a 0.1-uF cap to GND plus appropriate bulk capacitance. |+| 5 | AOUT1 | output | Bridge A output 1. Connect to bipolar stepper motor winding A. Positive winding current flows AOUT1 -> AOUT2. Rated for up to 2.5 A continuous. |+| 6 | ISENA | passive | Bridge A ground / current-sense return. Connect the low side of bridge A through the current-sense resistor for bridge A to GND. |+| 7 | AOUT2 | output | Bridge A output 2. Connect to bipolar stepper motor winding A. Positive current is AOUT1 -> AOUT2. |+| 8 | BOUT2 | output | Bridge B output 2. Connect to bipolar stepper motor winding B. Positive current is BOUT1 -> BOUT2. |+| 9 | ISENB | passive | Bridge B ground / current-sense return. Connect the low side of bridge B through the current-sense resistor for bridge B to GND. |+| 10 | BOUT1 | output | Bridge B output 1. Connect to bipolar stepper motor winding B. |+| 11 | VMB | power_in | Bridge B power supply (8.2 to 45 V). Must be tied to the same supply as VMA; bypass with a 0.1-uF cap to GND plus appropriate bulk capacitance. |+| 12 | AVREF | input | Bridge A current-set reference input. Reference voltage for winding-A regulated current. Normally AVREF and BVREF are tied together; can be driven from V3P3OUT. Recommended VREF range 1 to 3.5 V. |+| 13 | BVREF | input | Bridge B current-set reference input. Reference voltage for winding-B regulated current. Normally tied to AVREF. |+| 14 | GND | power_in | Device ground. Also connect the exposed PowerPAD (PPAD) to GND for thermal dissipation. |+| 15 | V3P3OUT | power_out | Internal 3.3-V LDO regulator output (3.2/3.3/3.4 V typ, up to 1 mA load). Bypass to GND with a 0.47-uF 6.3-V ceramic capacitor. Can be used to supply VREF. |+| 16 | nRESET | input | Active-low reset input. Initializes the indexer logic and disables the H-bridge outputs when low. Internal pulldown. |+| 17 | nSLEEP | input | Sleep-mode input. Logic high enables the device; logic low enters low-power sleep. Internal pulldown. tWAKE = 1.7 ms from nSLEEP high to STEP accepted. |+| 18 | nFAULT | output | Open-drain fault output. Logic low when a fault condition (overtemperature, overcurrent) is present. Requires external pullup. VOL = 0.5 V max at IO = 5 mA. |+| 19 | DECAY | input | Decay-mode select input. Low = slow decay; open (floating) = mixed decay; high = fast decay. Has both internal pullup (~130 kOhm) and pulldown (~80 kOhm) so the floating state resolves to mid-rail (mixed). |+| 20 | DIR | input | Direction input. Logic level sets the stepping direction. Internal pulldown (~100 kOhm). |+| 21 | nENBL | input | Enable input. Logic high disables the outputs and indexer operation; logic low enables. Internal pulldown. |+| 22 | STEP | input | Step input. A rising edge causes the internal indexer to advance one microstep. Internal pulldown. fSTEP up to 250 kHz; min high/low pulse 1.9 us. |+| 23 | NC | unconnected | No internal connection. Leave this pin unconnected. |+| 24 | MODE0 | input | Microstep-mode select bit 0. Together with MODE1/MODE2 sets full, 1/2, 1/4, 1/8, 1/16, or 1/32 step. Internal pulldown. |+| 25 | MODE1 | input | Microstep-mode select bit 1. Together with MODE0/MODE2 sets the microstep resolution. Internal pulldown. |+| 26 | MODE2 | input | Microstep-mode select bit 2. Together with MODE0/MODE1 sets the microstep resolution. Internal pulldown. |+| 27 | nHOME | output | Open-drain home-position output. Logic low when the indexer is at the home state of the step table. Requires external pullup. |+| 28 | GND | power_in | Device ground. Second ground pin; connect together with pin 14 and the PowerPAD. |+| PAD | PPAD | power_in | Exposed thermal PowerPAD on the package bottom. Must be soldered to the PCB ground plane for thermal performance and connected to GND. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Bipolar stepper motor driver |+| Output | 2 N-channel full-bridges |+| Current | up to 2.5 A/coil (with cooling) |+| Microstepping | full to 1/32 (MODE0-2) |+| Control | STEP + DIR indexer |+| Motor supply | 8.2-45 V |+| Protection | OCP + OTP + UVLO |+| Package | HTSSOP-28 (thermal pad) |++## Ordering variants++- `DRV8825PWPR (HTSSOP-28)`+- `DRV8825 module (stepstick)`++## CAD (KiCad official)++- Symbol: `DRV8825 (generated from datasheet; KiCad has no symbol)`+- Footprint: `Package_SO:HTSSOP-28-1EP_4.4x9.7mm_P0.65mm`+- 3D model: TSSOP-28 (representative; real package HTSSOP-28)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/drv8825.pdf) (36 pp, sha256 `5b4dccc2497334e1`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/drv8825-datasheet.pdf)

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