BQ40Z50-R1 datasheet(34/56 Pages) TI2

Part #	BQ40Z50-R1

Description	bq40z50-R1 1-Series, 2-Series, 3-Series, and 4-Series Li-Ion Battery Pack Manager

PDF	56 Pages

Scroll/Zoom	100%

Manufacturer	TI2 [Texas Instruments]

Direct Link	https://www.ti.com

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34 / 56 page

bq40z50-R1

SLUSCB3 – JULY 2015

www.ti.com

Figure 28. System Present Pull-Down Resistor

Because the System Present signal is part of the pack connector interface to the outside world, it must be

protected from external electrostatic discharge events. An integrated ESD protection on the PRES device pin

reduces the external protection requirement to just R29 for an 8-kV ESD contact rating. However, if it is possible

that the System Present signal may short to PACK+, then R28 and D4 must be included for high-voltage

protection.

Figure 29. System Present ESD and Short Protection

9.2.2.2.4

SMBus Communication

The SMBus clock and data pins have integrated high-voltage ESD protection circuits, however, adding a Zener

diode (D2 and D3) and series resistor (R24 and R26) provides more robust ESD performance.

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BQ40Z50-R1 Datasheet(PDF) 34 Page - Texas Instruments