| 摘要 |
A power management unit monitors current drawn by a fingerprint sensor circuit and generates a "heartbeat" signal during normal operation. If a latchup event occurs, with attendant increase in current drawn by the fingerprint sensor circuitry, the heartbeat signal terminates and an interrupt is subsequently triggered to start a latchup recovery routine. Power to the fingerprint sensor circuitry is switched off and the interrupt is then cleared by writing appropriate values to control bits within the power management register.
|
