BQ500414Q Datasheet, PDF (26/34 Pages) Texas Instruments – Qi Compliant Wireless Power Transmitter Manager

bq500414Q
SLUSBE4B – JANUARY 2014 – REVISED JUNE 2014
Layout Example (continued)
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Figure 17. Current Sensing Layout
COMM+/COMM– sense lines should be run as a balanced or differential pair. The WPC packet information runs
at 2-kHz, which is essential audio frequency content and this balancing reduces noise pickup from the
surrounding switching power electronics. There is no need to tune or impedance-match these lines as would be
the case in RF signaling.
COMM+
COMM-
Figure 18. Balanced COMM Lines Layout
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