UPD30121 datasheet(11/76 Pages) NEC

11 / 76 page

Data Sheet U14691EJ1V0DS00

µµµµPD30121

(3)

Battery monitor interface signals

Signal

I/O

Function

BATTINH/

BATTINT#

This function differs depending on how the MPOWER signal is set.

BATTINH function

This signal enables/prohibits activation due to power-on.

1 : Enable activation

0 : Prohibit activation

BATTINT# function

This is an interrupt signal that is output when remaining power is low during normal operations. The

external agent checks the remaining battery power. Activate the signal at this pin if voltage sufficient

for operations cannot be supplied.

(4)

Initialization interface signals

Signal

I/O

Function

MPOWER

This signal indicates the VR4121 is operating. This signal is inactive during Hibernate mode.

POWERON

This signal indicates the VR4121 is ready to operate. It becomes active when a power-on factor is

detected and becomes inactive when the BATTINH/BATTINT# signal check operation is completed.

POWER

This is a VR4121 activation signal.

RSTSW#

This is a VR4121 reset signal.

RTCRST#

This signal resets RTC. When power is first supplied to a device, the external agent must assert the

signal at this pin for about 2 s.

UPD30121 Datasheet(PDF) 11 Page - NEC