VCC

bq78350

C22

C21

RBI

22

bq78350-R1

SLUSCD0B – AUGUST 2015 – REVISED NOVEMBER 2018

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Layout Guidelines (continued)

11.1.3 Communication Line Protection Components

The 5.6-V Zener diodes, which protect the bq78350-R1 communication pins from ESD, must be located as close

as possible to the pack connector. The grounded end of these Zener diodes must be returned to the PACK(–)

node, rather than to the low-current digital ground system. This way, ESD is diverted away from the sensitive

electronics as much as possible.

11.1.4 ESD Spark Gap

Protect the SMBus clock, data, and other communication lines from ESD with a spark gap at the connector. The

following pattern is recommended, with 0.2-mm spacing between the points.

Figure 15. Recommended Spark-Gap Pattern Helps Protect Communication Lines From ESD

11.2 Layout Example

Figure 16. bq78350-R1 Layout