1 Features

1• Built-In Lock Detection and Rotational Speed

Sensing Mechanisms

• Compact 8-Pin Package Reduces Number of

External Components Required

• Automatic Restart When Motor Lock Is Undone

• Hall Amplifier Inputs Have Hysteresis

2 Applications

Small Server Fans

3 Description

The TMP821 device is a two-phase half-wave motor

predriver that is suited for fan motors, which has

winding in push-pull configuration. It uses differential

hall effect sensors for commutation signals for two of

the switches in power circuit. The device has a very

small pin count, making it very simple to use.