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Part Number: BQ500212A
Dear Supporting team,
For my bq500212a, the gate and coil voltage signal is fine as the datasheet with 80ms pulse and 300ms rest under led mode 2.
The led2 keep ON and led1 and 3 are Off which response as fault.
Two behavior are strange on the board.
1. The supply voltage is having pulse (like the gate signal) on top of the 3.3V
2. The comm+ signal is having offset, and pulse. which is the most different from correct discharge behavior.
I checked the demodulation circuit and the value are same with reference design. I did not use the diode on board as I notice later that its not included in "PWR550" design.
I wonder if my pulsed noise on Vcc will have serious problem?
Also, what are possible problems on the Comm+?
Thanks and Best Regards,
Bill Johns, Applications Engineer
Texas Instruments Inc
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In reply to Bill Johns:
After some time, i found my comm+ signal is from the point after the series cap. which seems different to reference design that getting the coil voltage.
I put the connection before series cap but the waveform still the same.
yellow trace is the supply
blue is the coil voltage after the series capacitor
pink is the comm+ signal.
Thanks and regards,
In reply to calvin chow:
Thank you for your reply,
Isense connection is good. Pin 1 is grounded with 10k ohm.
Now both LED1, 2 turn on which should be in stand by mode. However, the comm+ and coil voltage did not response when the receiver appears <5mm above. I have tested the receiver with TYLT VU SOLO. So the receiver is fine.
I have a question about comm+ waveform in slua635a. should this pulse signal appears all the period during standby and transfer?
I have both LED1,2 ON but could not work with the receiver.
Here are the TX plot. Ch1: Isense, Ch2: Vsense, Ch3: Comm+, Ch4: Vcoil
As you suggest, I tried to probe on different pin on the TLYT TX. and they look different from mine.
CH1: comm+, Ch3: Isense, Ch4:Vcoil
Ch3: Vsense, Ch4:Vcoil
i) My COMM+ signal is also 1.5V when its not pinging.
ii) My Isense is non zero when its pinging and opposite with TLYT
Would you have any idea of what problem I may have?
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