The TCN75A is a temperature-to-digital converter with 12-bit resolution. It offers an accuracy of ±0.5°C (typical) at +25°C and ±3°C (maximum) from +25°C to +100°C. The converter features user-selectable resolution, an operating voltage range of 2.7V to 5.5V, a 2-wire interface, low operating current, and power-saving modes. It is commonly used in personal computers, hard disk drives, entertainment systems, office equipment, data communication equipment, and general-purpose temperature monitoring.
This document describes the TCN75A temperature sensor, including its band‑gap temperature sensor, ZA ADC, programmable registers, and 2‑wire I²C‑compatible interface. It details the functional block diagram, pin assignments, and the operation of the ALERT output.
Key sections cover electrical characteristics (voltage ranges, currents, ESD protection), typical performance curves (temperature accuracy, supply current), pin description tables, and functional description of the sensor and ADC. The datasheet also includes regulatory and contact information for Microchip worldwide sales and service.
| Operating Voltage Range (Vop) | 2.7 V to 5.5 V |
|---|---|
| Operating Current (Ipp) | 200 µA to 500 µA |
| Shutdown Current (IsHDN) | 0.1 µA to 2 µA |
| Power‑On Reset Threshold (Vpor) | 1.7 V |
| Temperature Sensor Accuracy at +25 °C | ±0.5 °C (typ.) |
| Conversion Time (12‑bit) | 240 ms |
| Alert Output High‑level Current | 1 mA |
| Alert Output Low‑level Voltage | 0.4 V |
| Latch‑up Current per Pin | 200 mA |
| Storage Temperature Range | -65 °C to +150 °C |
| Ambient Temperature (Power Applied) | 55 °C to +125 °C |
The device operates from 2.7 V to 5.5 V.
The ALERT pin is an open‑drain output that signals when the ambient temperature exceeds the programmed limit.
Each pin can tolerate up to 200 mA of latch‑up current.