ST2202 datasheet(60/65 Pages) ETC

60 / 65 page

Sitronix

ST2202

Ver 2.0a

60/65

2003-May-05

2.. L

W V

E D

ST2202 has a built-in low voltage detector for power

management. The typical active level of voltage detection is

2.6V. When LVDEN (SYS[0]) is set, detector circuit is

enabled and the detection result will be outputted at the

same bit after 3

µs. Using read instruction twice can get

this result: first read will enable initial stableness control.

Second read equal '0' represents 'low voltage'. Once low

voltage detector is enabled, it keeps on consuming power.

So it is important that remember to write “0” to LVDET to

disable the detector after detection is completed. One

sample program is shown below:

Start:

SMB0

<SYS

; enable detector

Wait 3

µµµµs

SEC

BBS0

<SYS,$+3

BBS0

<SYS,Normal_Voltage

Low_Voltage:

CLC

Normal_Voltage:

RMB0

<SYS

; disable detector

TABLE 22-1 System Control Register (SYS)

Address Name

R/W

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Default

XSEL

OSTP

XSTP

XBAK

WSKP

WAIT

IRREN

HIGH

0000 0001

$030

SYS

XSEL

OSTP

XSTP

XBAK

WSKP

WAIT

IRREN

LVDEN

0000 0000

Bit 0: LVDEN : Low voltage detector control bit (W)

0 = Disable detector

1 = Enable detector

Bit 0: HIGH : Low voltage detector result (R)

0 = Voltage is low

1 = Voltage is normal

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