# GX21M15

**GXCAS** · Temperature Sensors · SOP-8

GX21M15 from GXCAS, in a SOP-8. 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 | SDA | bidirectional | I2C bus bidirectional data line with open-drain output; if the bus pull-ups do not meet I2C requirements, an external pull-up of about 10 kΩ is needed, and SDA must not float because it has no internal bias. |
| 2 | SCL | input | I2C bus clock input that must be driven by the bus master and must not float because it has no internal bias. |
| 3 | OS | output | Over-temperature protection/interrupt open-drain output that needs an external pull-up (up to 200 kΩ recommended) and has a maximum output sink current of 10 mA. |
| 4 | GND | power_in | Ground, connected to the system ground. |
| 5 | A2 | input | Digital input for user-configured address bit 2, tied to GND (logic 0) or VCC (logic 1) and must not float. |
| 6 | A1 | input | Digital input for user-configured address bit 1, tied to GND (logic 0) or VCC (logic 1) and must not float. |
| 7 | A0 | input | Digital input for user-configured address bit 0, tied to GND (logic 0) or VCC (logic 1) and must not float. |
| 8 | VCC | power_in | Power supply port; operating supply range is 2.8 V to 5.5 V and the absolute maximum rating is 6.0 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | GXCAS |
| Package | SOP-8 |
| Category | Sensors |
| Pins | 8 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage (absolute maximum) | VCC | -0.3 |  | 6 | V |  | 15 |
| Input voltage (absolute maximum) | VI | -0.3 |  | 6 | V | 在输入端口 | 15 |
| Input current (absolute maximum) | II | -5 |  | 5 | mA | 在输入端口 | 15 |
| Output sink current (absolute maximum) | IO(sink) |  |  | 10 | mA | OS 端口 | 15 |
| Output voltage (absolute maximum) | VO | -0.3 |  | 6 | V | OS 端口 | 15 |
| Storage temperature (absolute maximum) | Tstg | -65 |  | 150 | C |  | 15 |
| Junction temperature (absolute maximum) | Tj |  |  | 150 | C |  | 15 |
| Supply voltage (recommended operating) | VCC | 2.8 |  | 5.5 | V |  | 15 |
| Ambient temperature (recommended operating) | Tamb | -55 |  | 125 | C |  | 15 |
| Temperature accuracy | Tacc | -1 |  | 1 | C | Tamb = 25 C to +100 C | 16 |
| Temperature accuracy | Tacc | -2 |  | 2 | C | Tamb = 55 C to +125 C | 16 |
| Number of faults (programmable) | Nfault | 1 |  | 6 |  | 可编程；故障数转换 | 16 |
| Input low voltage | VIL | -0.3 |  |  | V | 数字引脚 | 16 |
| High-level input current | IIH | -1 |  | 1 | μA | 数字引脚； VI = VCC | 16 |
| Low-level input current | IIL | -1 |  | 1 | μA | 数字引脚； VI = 0 V | 16 |
| Output low voltage (SDA and OS pins) | VOL |  |  | 0.4 | V | SDA 和 OS 引脚； IOL = 3 mA | 16 |
| Output low voltage (SDA and OS pins) | VOL |  |  | 0.8 | V | IOL = 4 mA | 16 |
| Output leakage current (SDA and OS pins) | ILO |  |  | 10 | μA | SDA 和 OS pins; VOH = VCC | 16 |
| Average supply current, I2C bus inactive | IDD(AV) |  | 80 | 200 | μA | 正常模式: I2C 总线未激活 | 16 |
| Average supply current, I2C bus active | IDD(AV) |  |  | 300 | μA | 正常模式: I2C 总线激活; fSCL = 400 kHz | 16 |
| Average supply current, sleep mode |  |  | 0.2 | 1 | μA | 睡眠模式 | 16 |
| Bus error timeout | tto | 75 |  | 200 | ms |  | 18 |
| SCL clock frequency | fSCL | 0.02 |  | 400 | kHz | 见 图 20 | 18 |
| SCL high period | tHIGH | 0.6 |  |  | s |  | 18 |
| SCL low period | tLOW | 1.3 |  |  | s |  | 18 |
| START hold (repeated) time | tHD;STA | 100 |  |  | ns |  | 18 |
| Data setup time | tSU;DAT | 100 |  |  | ns |  | 18 |
| Data hold time | tHD;DAT | 0 |  |  | ns |  | 18 |
| STOP setup time | tSU;STO | 100 |  |  | ns |  | 18 |
| Input hysteresis voltage (SCL and SDA pins) | VI(hys) |  | 300 |  | mV |  | 16 |
| Input hysteresis voltage (A2, A1, A0 pins) | VI(hys) |  | 150 |  | mV |  | 16 |
| Temperature resolution | Tres |  | 0.125 |  | C | 11-bit 数字数据 | 16 |
| Temperature conversion time | tconv(T) |  | 10 |  | ms | 正常模式 | 16 |
| Conversion period | Tconv |  | 100 |  | ms | 正常模式 | 16 |
| Overtemperature shutdown threshold (default) | Tth(ots) |  | 80 |  | C | 默认值 | 16 |
| Hysteresis temperature (default) | Thys |  | 75 |  | C | 默认值 | 16 |
| Input capacitance (digital pins) | Ci |  | 20 |  | pF | 数字引脚 | 16 |
| Fall time (SDA and OS output ports) | tf |  | 250 |  | ns | CL = 400 pF; IOL = 3 mA | 18 |

## CAD (KiCad official)

- Symbol: `GX21M15`
- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`
- 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files: `gx21m15-etched.step` / `gx21m15-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `gx21m15.step` / `gx21m15.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [GXCAS datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588907422626811904) (23 pp, sha256 `478f9899d0a06ed6`, retrieved 2026-10-18, 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 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (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/gx21m15-datasheet.pdf)