EM3027IDSWS8 datasheet(21/28 Pages) EMMICRO

21 / 28 page

EM3027

 2013, EM Microelectronic-Marin SA

3027-DS.doc, Version 8.0, 25-Jan-13

www.emmicroelectronic.com

9.2

Low Supply Detection

The supply voltage level is monitored periodically versus

Vlow1 and Vlow2 levels. The monitoring rate is one

second. When the voltage monitoring is running, a higher

current consumption for few milliseconds occurs.

At the power-up of the device, as long as the supply

voltage stays below Vlow2, the monitoring rate is

accelerated. To enable normal operation, the chip must

be supplied with a voltage above Vlow2, to enable the

readout of initialization data from EEPROM and to stop

the higher current consumption.

When the supply voltage drops from the normal range

(from 2.1V to 5.5V) below Vlow1, the VLOW1 status bit is

set to ‘1’ by the voltage monitoring system.

When bit VLOW1 is at ‘1’, the thermometer is disabled

and

the

automatic

computation

the

thermal

compensation

value

(COMP_val)

for

frequency

correction is inhibited. In this case, the last computed

compensation value is used.

To leave the VLOW1 status, the supply voltage must be

increased above the Vlow1 level and a

‘0’ value must be

written into the VLOW1 status bit via the serial interface.

When the supply voltage drops below the Vlow2 level,

the VLOW2 status bit is set by the voltage monitoring

system.

The VLOW2 status bit disables the read out of the

EEPROM.

To leave the VLOW2 status, the supply voltage must be

increased above the Vlow2 level and

a ‘0’ value must be

written into the VLOW2 status bit via the serial interface.

Below Vlow2 level, device functionality is not guaranteed

and register contents can be corrupted. Therefore, if

VLOW2 status bit is set, it is recommended to perform

system reset by writing of ‘1’ into SYSRes bit in RstCtrl

page and afterwards update content of Watch, Alarm and

Timer registers.

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