Functional description

GG25L

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DocID025995 Rev 1

Figure 11. BATD and RSTIO

The BATD/CD pin used as a battery detector is an analog I/O.The input detection threshold

is typically 1.61 V.

impedance.

The RSTIO signal is used to control the application system reset during the initial OCV

measurement. The RSTIO pin is a standard I/O pin with open drain output.

BATD/CD can be connected to the NTC sensor or to the identification resistor of the battery

pack. The GG25L does not provide any biasing voltage or current for the battery detection.

An external pull-up resistor or another device has to pull the BATD/CD pin high when the

battery is removed.

Figure 12. BATD/CD pin connection when used as battery detector

BATD/CD

RSTIO

VCC

BATD_drive_high

BATD_comp_out

RSTI

RSTO

1.61 V

+

-

GG25L

GG25L

Other biasing

and/or detection

circuit

Battery

pack

BATD/CD

Rid

BATD biasing by external circuitry

BATD resistor biasing

Battery pack

Rid

Ru

(>1 M)

1K

1K

BATD/CD