Dear sir
As i read the datasheet of TI TPS7B7701-Q1, i had a question as below:
Refer to the datasheet of page13(Table 1. Fault Table);
If TPS7B7701-Q1 detected open load, the ERR pin is high level; If the circuit is normal ,the ERR pin is also high level.
Is it say, when the circuit is open load or normal, the signal from ERR pin to the MCU I/O port are the same?
If not,how can we discriminate ?
Thanks.
Hi Bin,
You are correct that the /ERR pin will be logic high for Open load, Normal, and Overcurrent indicating that a fault condition has not triggered any of the internal protection circuits. When an internal protection circuit is tripped in the event of current limit, thermal shutdown, output short-to battery, or reverse current, the /ERR pin will be logic low indicating a fault.
You will not be able to distinguish which fault condition triggered /ERR to go logic low or which condition (open load, normal, or overcurrent) is indicated by a logic high by the /ERR pin alone as it is an open drain pin with only a logic high or logic low state. You will need to measure the voltage on the SENSE pin in order to determine what state you are in.
Very Respectfully,
Ryan
