P9235A-R Datasheet

© 2016 Integrated Device Technology, Inc

16

May 17, 2016

Buzzer Function

The BUZ pin is able to drive a piezoelectric type transducer without amplification. As shown on the reference schematic, a series current

limiting resistor (R20) must be included if a buzzer is used. The buzzer signal is a 2 kHz square wave. It is recommended to use a buzzer with

a 2 kHz resonant frequency for best results.

End of Power Transfer Response

The P9235A-R will shut down and stop the power transfer once it receives an End of Power Transfer (EPT) packet. The P9235A-R will

behave differently based on the reason for the EPT request. Table 10 shows the different EPT behaviors.

Table 10. End of Power Transfer Response

EPT Reason

P9235A-R Behavior

End of Power Transfer:

Over-Current

The P9235A-R will shut down the system, keeping the analog ping and digital ping. If the over-current

condition is not removed, the system will enter into a hiccup mode. In hiccup mode the following sequence

is repeated while the over current condition exists: the system starts up and applies the receiver voltage to

the load, the receiver detects an over current condition and reports it to the transmitter, the transmitter

shuts down.

End of Power Transfer:

Over-Temperature

The P9235A-R will shut down the system, keeping the analog ping but muting the digital ping for 5

minutes. If the P9027LP-R is removed within 5 minutes, the P9235A-R will restart the digital ping. After 5

minutes, the P9235A-R will send out one digital ping to check if the fault condition has been removed.

End of Power Transfer:

Charge Complete.

The P9235A-R will shut down the system, keeping the analog ping but muting the digital ping for 5

minutes. If the P9027LP-R is removed within 5 minutes, the P9235A-R will restart the digital ping. After 5

minutes, the P9235A-R will send out one digital ping to check if the battery needs to start charging again.

End of Power Transfer:

Internal Fault

The P9235A-R will shut down the system, keeping the analog ping and digital ping.