This datasheet describes the features and applications of the Microchip TC77 temperature sensor. The TC77 is a low-cost, small-form-factor digital temperature sensor with a SPI and MICROWIRE compatible interface that can operate over a 2.7 V to 5.5 V power supply voltage. Typical applications include hard disk drive and other PC peripheral thermal protection, notebook computer PC card devices, low-cost thermostat controls, industrial control, office equipment, cellular phones, and thermistor replacement.
The TC77 is a digital temperature sensor offered in 5‑pin SOT‑23A and 8‑pin SOIC packages. It provides a 13‑bit temperature output via an SPI and MICROWIRE compatible three‑wire serial interface, making it suitable for low‑cost, small‑form‑factor applications such as hard‑disk thermal protection, PC peripherals, and industrial control.
Key features include a temperature resolution of 0.0625 °C per LSB, operating voltage from 2.7 V to 5.5 V, low power consumption (250 µA continuous, 0.1 µA shutdown), and accuracy ranging from ±1 °C to ±8 °C depending on the temperature range. The document provides detailed electrical specifications, timing diagrams, and performance curves.
| Operating Voltage Range | 2.7 V – 5.5 V |
|---|---|
| Resolution | 13 bits (0.0625 °C/bit) |
| Continuous Mode Current | 250 µA typ. |
| Shutdown Mode Current | 0.1 µA typ. |
| Temperature Accuracy (+25°C to +65°C) | ±1 °C (max) |
The TC77 uses a three‑wire serial interface that is compatible with SPI and MICROWIRE specifications.
The sensor provides a 13‑bit output giving a resolution of 0.0625 °C per LSB.
It draws about 250 µA typical in continuous conversion mode.
In shutdown mode the TC77 consumes approximately 0.1 µA typical.