# M5Stack Unit Step16 (U198)

> M5Stack U198 Unit Step16: a 16-position rotary encoder (GSMR-16, 8421 BCD code) read by an on-board STM32G031 that shows the 0–F position on a 7-segment display and reports it over I2C (0x48, address configurable) on an HY2.0-4P Grove port; WS2812 RGB LED, 100 ms update, 5 V at 5.85 mA standby, 32 × 24 × 16.9 mm, 5.5 g.

- Manufacturer: M5Stack
- Part number: U198
- Category: Encoders
- Canonical page: https://www.xirkit.io/products/m5stack-unit-step16-u198-c43c
- Pinout: https://www.xirkit.io/products/m5stack-unit-step16-u198-c43c/pinout
- Structured JSON: https://www.xirkit.io/products/m5stack-unit-step16-u198-c43c/data.json
- Source: Xirkit structured parts catalog — every value traced to a cited document; unknowns are explicit.

## Key specifications

| Property | Value |
| --- | --- |
| Sensing | mechanical |
| Type | absolute |
| Resolution | 16 CPR |
| Channels | 4-bit BCD decoded on board (value over I2C) |
| Interface | i2c |
| Output | I2C position value 0–F (address 0x48) |
| Index channel | no |
| Supply voltage | 5–5 V |
| Dimensions | 32 × 24 × 16.9 mm |

## Pinout (4 pins, 0 with electrical limits)

| Pin | Position | Kind | Chip pad | Functions | VIH | VIL | VOH | VOL | IOH | IOL | 5 V tolerant |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| GND | HY2.0-4P (Grove) · PORT.A-1 | ground | — | ground | — | — | — | — | — | — | — |
| 5V | HY2.0-4P (Grove) · PORT.A-2 | power in | — | power_in | — | — | — | — | — | — | — |
| SDA | HY2.0-4P (Grove) · PORT.A-3 | data | — | sda | — | — | — | — | — | — | — |
| SCL | HY2.0-4P (Grove) · PORT.A-4 | clock | — | scl | — | — | — | — | — | — | — |

## Where to buy

| Supplier | Price | Stock | Checked | URL |
| --- | --- | --- | --- | --- |
| shop.m5stack.com | 6.95 USD | in_stock | 2026-10-01 | https://shop.m5stack.com/products/step16-unit-with-16-bit-rotary-encoder-gsmr-16 |

## FAQ

**What voltage powers the M5Stack Unit Step16 (U198)?**

Supply range 5–5 V.

**How much does the M5Stack Unit Step16 (U198) cost?**

From $6.95 at shop.m5stack.com. Prices are observed unit prices before tax and shipping.

**What are the M5Stack Unit Step16 (U198) dimensions?**

32 × 24 × 16.9 mm. A STEP model is available for enclosure fit checks.

**Where does this M5Stack Unit Step16 (U198) data come from?**

Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.

## Sources

- [M5Stack Unit Step16 (U198) datasheet](https://shop.m5stack.com/products/step16-unit-with-16-bit-rotary-encoder-gsmr-16)
- [shop.m5stack.com listing](https://shop.m5stack.com/products/step16-unit-with-16-bit-rotary-encoder-gsmr-16)