Datasheet

bq500211A
www.ti.com SLUSBB1A – DECEMBER 2012–REVISED SEPTEMBER 2013
Fault Handling and Indication
The following is a table of End Power Transfer (EPT) packet responses, fault conditions, the duration how long
the condition lasts until a retry in attempted. The LED mode selected determines how the LED indicates the
condition or fault.
DURATION
CONDITION HANDLING
(before retry)
EPT-00 Immediate Unknown
EPT-01 5 seconds Charge complete
EPT-02 Infinite Internal fault
EPT-03 5 minutes Over temperature
EPT-04 Immediate Over voltage
EPT-05 Immediate Over current
EPT-06 Infinite Battery failure
EPT-07 Not applicable Reconfiguration
EPT-08 Immediate No response
OVP (over voltage) Immediate
OC (over current) 1 minute
NTC (external sensor) 5 minutes
10 seconds LED only,
PMOD/FOD warning 12 seconds 2 seconds LED +
buzzer
PMOD/FOD 5 minutes
Power Transfer Start Signal
The bq500211A features two signal outputs to indicate that power transfer has begun. Pin 23 outputs a 400-ms
duration, 4-kHz square wave for driving low cost AC type ceramic buzzers. Pin 24 outputs logic high, also for 400
ms, which is suitable for DC type buzzers with built-in tone generators, or as a trigger for any type of customized
indication scheme. If not used, these pins can be left open.
Power-On Reset
The bq500211A has an integrated Power-On Reset (POR) circuit which monitors the supply voltage and handles
the correct device startup sequence. Additional supply voltage supervisor or reset circuits are not needed.
External Reset, RESET Pin
The bq500211A can be forced into a reset state by an external circuit connected to the RESET pin. A logic low
voltage on this pin holds the device in reset. For normal operation, this pin is pulled up to 3.3 V
CC
with a 10-kΩ
pull-up resistor.
Trickle Charge and CS100
The WPC specification provides an End-of-Power Transfer message (EPT–01) to indicate charge complete.
Upon receipt of the charge complete message, the bq500211A will change the LED indication to solid green LED
output and halt power transfer for 5 seconds.
In some battery charging applications there is a benefit to continue the charging process in trickle-charge mode
to top off the battery. There are several information packets in the WPC specification related to the levels of
battery charge (Charge Status). The bq500211A uses these commands to enable top-off charging. The
bq500211A changes the LED indication to reflect charge complete when a Charge Status message is 100%
received, but unlike the response to an EPT, it will not halt power transfer while the LED is solid green. The
mobile device can use a CS100 packet to enable trickle charge mode.
If the reported charge status drops below 90% normal, charging indication will be resumed.
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