COMM1 / COMM2 capacitor values

m w

Part Number: BQ51050B

I am a little confused about the values that should be used for the COMM1 to AC1 and COMM2 to AC2 for the Communication Modulator on the bq51050b.

Section 8.3.4.8 of the bq5105xB data sheet indicates a 47nF capacitor should be used for each (for a total of about 22nF)
SLUUA25C (bq51050BEVM-764) uses a 22nf Capacitor for each

Which value should I use?
How critical are these capacitor values?

over 7 years ago

0 Bill Johns over 7 years ago

TI__Guru* 75806 points

The value to start with is 22nF.
Values as high as 68nF have been used. But this will depend on RX coil L, large L for a small coil will drive down the Cs value and smaller value for COMM may work better.

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COMM1 / COMM2 capacitor values