BMA580

{
  "schema_version": 1,
  "type": "component",
  "slug": "bma580-561000",
  "title": "BMA580",
  "brief": "Compact 8×8 mm I²C-only breakout for the Bosch BMA580 accelerometer (fixed 0x18, on-chip hardware AI step counter / classifier).",
  "version": "1.0.0",
  "tags": [],
  "license": "MIT",
  "component": {
    "mpn": "BMA580",
    "manufacturer": "",
    "package": "",
    "pin_count": null,
    "category": "other",
    "subcategory": "",
    "body_size": null,
    "parts": {},
    "distributor_links": {},
    "molecule_id": 15078774497312561000
  },
  "readme": "# BMA580 Molecule — Hardware Reference\n\nTiny (~8×8 mm) 4-corner-pin breakout for the Bosch BMA580 next-gen 3-axis accelerometer with hardware AI step counter.\n\n- **Source:** [adom-inc/bosch-molecules/BMA580](https://github.com/adom-inc/bosch-molecules/tree/main/BMA580) — imported 2026-04-17\n- **KiCad project:** `BMA580.kicad_pro`\n- **Wiki page:** [molecules/bma580-561000](https://wiki-ufypy5dpx93o.adom.cloud/wiki/molecules/bma580-561000)\n- **Board:** 7 contacts (4 corner mount-pins carry power/I²C, 3 side contacts carry INTs + extra V+ tap), single-sided assembly, silk revision `V1.0 8/29/25`\n- **IC:** BMA580 (Bosch BMA580 LGA, 2.0 × 2.0 × 0.65 mm, AC1)\n\n## Component summary\n\n| Ref | Part | Function |\n|---|---|---|\n| AC1 | BMA580 | 3-axis accelerometer — I²C only on this breakout (no SPI jumper) |\n| C1 | 100 nF 0402 | V+ decoupling |\n| D1 | LED 0402 | Power indicator |\n| R1 | LED current-limit 0402 | — |\n\nNo address-select jumper. **Silk on the PCB calls out `BMA580 I2C: 0x18` — the address is fixed at 0x18** on this molecule (SDO strap hard-tied on-board).\n\n## External contact map\n\n| Ref | Silk | Net | Kind | Role |\n|---|---|---|---|---|\n| MP1 | `V+` | `V+` | mount | VDD / VDDIO (shared 3.3 V) |\n| MP2 | `GND` | `GND` | mount | Ground |\n| MP3 | `SDA` | `SDA` | mount | I²C SDA |\n| MP4 | `SCL` | `SCL` | mount | I²C SCL |\n| MC1 | `INT2` *(silk typo — actually INT2)* | `INT2` | contact | Interrupt output 2 |\n| MC2 | `INT2` *(silk typo — actually **INT1**)* | `INT1` | contact | Interrupt output 1 |\n| MC3 | `V+` | `V+` | contact | Extra V+ tap (power distribution, useful when daisy-chaining) |\n\n### Silk misprint on v1\n\nBoth interrupt castellations are silk-labelled `INT2`, but the netlist (and the IC pin map) confirm **MC1 is INT2** and **MC2 is INT1**. The BMA580 pinout is: pin 2 = INT1, pin 3 = INT2. Use the position in the `.kicad_pcb` coordinate frame to disambiguate:\n\n- MC1 @ (24.0, 20.0) → Y = 20 → upper edge (near V+ silk) = **INT2**\n- MC2 @ (24.0, 28.0) → Y = 28 → lower edge (near GND silk) = **INT1**\n\nWorth taping a small label onto physical boards if you end up actually using the INT lines.\n\n## Power\n\n| Rail | Voltage | Source |\n|---|---|---|\n| V+ (VDD = VDDIO tied) | 1.71–3.6 V (3.3 V in demo) | Host, via MP1 (or MC3 as an alternate tap) |\n\nSingle rail. Typical active current 145 µA in normal mode (datasheet).\n\n## Interrupts\n\nINT1 and INT2 are push-pull active-low by default; both are software-configurable for features like any-motion, data-ready, FIFO watermark, or the BMA580's hardware step counter / classifier. Unused → leave MC1/MC2 floating.\n\n## Wiring to the Arm RM2 I²C bus\n\n```\nBMA580 MP1 (V+)   ──── RM2 +3V3\nBMA580 MP2 (GND)  ──── RM2 GND\nBMA580 MP3 (SDA)  ──── RM2 GPIO4 (I²C0 SDA)\nBMA580 MP4 (SCL)  ──── RM2 GPIO5 (I²C0 SCL)\nBMA580 MC1 (INT2) ──── (optional)\nBMA580 MC2 (INT1) ──── (optional)  ← silk says INT2, it's INT1\nBMA580 MC3 (V+)   ──── (optional — second power tap)\n```\n\n## Gotchas for firmware bring-up\n\n- **Address is fixed at 0x18** — no jumper to mis-set. If the bus doesn't see 0x18 it's a wiring / pull-up problem, not an address problem.\n- **Silk misprint on both INT contacts** (see above). If interrupts matter for your use case, trust the netlist / board position rather than the silk.\n- **4.7 kΩ bus pull-ups are off-board** — provided by the RM2 carrier.\n- The BMA580 has a stricter VDD minimum (1.71 V) than the BMA400 (1.2 V). If you're running the whole bus on 1.8 V for some reason, the BMA580 still works but has less margin.\n",
  "author": {
    "id": "695820315b5f1e4db2fcf602",
    "name": "Kyle Bergstedt",
    "email": "[email protected]"
  },
  "visibility": {
    "public": true
  },
  "hero": null,
  "sample_prompts": [],
  "discovery_triggers": [],
  "discovery_pitch": null,
  "metadata": {},
  "created_at": "2026-05-28T05:31:13.452Z",
  "updated_at": "2026-05-28T05:31:13.452Z"
}