EM6812F2TP24B datasheet(33/81 Pages) EMMICRO

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EM6812

www.emmicroelectronic.com

Supply Voltage Level Detector (SVLD)

The EM6812 has a built in 8 level supply voltage detector that compares the supply voltage against a predefined voltage

level. The CPU can inspect the result of the comparison, it reads ‘0’ if the supply voltage is higher than the compare level

and ‘1’ if lower.

The lowest compare level is equivalent to the brown out detection level. Obviously this level can only be measured if the

brown out function is switched off. Also the SVLD function is temporarily disabled during Sleep mode.

The internal bandgap reference is shared between the SVLD and the BrownOut function. If active, it will consume an extra

~6µA during the whole measuring time

Figure 19. SVLD architecture

Timings:

- Internal voltage reference settling time:

8ms

(From either EnSVLD=’1’ or EnBrownOut=’1’).

Must be respected when the voltage reference gets switched on.

- Comparator settling time: 10µs

(From EnSVLD=’1’ to 1

st readout)

Must be respected for every measure before reading the result.

Table 27. Analogue configurations register

RegAnaCfg

0x20

Analogue configurations

Bit

Name

Res

Reset by

R/W

Description

EnSVLD

ResSys

R/W

Enable the SVLD function

EnBrownOut

POR

R/W

Enable the Brownout function

SVLDLevel1

ResSys

SVLDLevel2

ResSys

SVLDLevel3

ResSys

SVLD level selection (1 out of 8 levels)

SVLDStatus

SVLD result ‘0’ = VDD > SVLD Level

‘1’ = VDD < SVLD Level

Table 28. SVLD selection table

SVLDLevel3

SVLDLevel2

SVLDLevel1

Typical Detection Level

2.0

2.1

2.2

2.3

2.4

2.5

2.6

3.4

Vref = 1.2V

Level1

EnBrownOut

Level3

Level4

Level5

Level6

SVLDLevel

selector

Level7

Level2

VDD

SVLDResult

EnSVLD

BrownOut

EnBrownOut

Level8

VSS

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