STW4810 datasheet(33/72 Pages) STMICROELECTRONICS

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STw4810

4 Functional description

Rev3

33/72

4.3.7

Power supply monitoring

This block monitors the VCORE and VIO_VMEM output voltage. If VCORE or VIO_VMEM drop

below the threshold, the multimedia processor is reset.

This feature can be desactivated by setting EN_MONITORING bit of Power control register

(

Table 28) to “0”.

4.3.8

Power supply domains

Table 28 lists the register bits that control the different STw4810 supply domains for each

supply.

Note:

More details on VMMC supply are given in Section 4.5

4.3.9

Thermal shut-down

A thermal sensor is used to monitor the die temperature.

●

As soon as the die temperature exceeds the thermal warning rising threshold 1, VDDOK

ball goes to “0” and ‘it_warn’ bit is set to “1” (SD MMC control register -

Table 17). The IC

turns back VDDOK ball to “1” and ‘it_warn’ bit to “0” when the device temperature drops

below the thermal warning falling threshold 1 of the thermal sensor.

●

A second thermal detection level, thermal shutdown rising threshold 2, puts all STw4810

supplies OFF, the supplies goes back to ON state when the temperature reaches the

thermal shutdown falling threshold 2.

Table 28.

Power supply domains

Supply

name

Description

Supply domains

Normal

Sleep

Power down

VCORE

STEP-DOWN

15 values

VCORE_SEL[3:0]

VCORE_SLEEP

VCORE_FORCE_SLEEP

EN_VCORE

VIO_VMEM

STEP-DOWN

1.8 V

VIO_VMEM_SLEEP

VIO_VMEM_FORCE_SLEEP

VPLL

LDO

4 values

VPLL_SEL[1:0]

EN_VPLL

VANA

LDO

2.5 V

EN_VANA

VAUX

LDO

4 values

VAUX_SEL[1:0]

VAUX_SLEEP

VAUX_FORCE_SLEEP

PDN_VAUX

VMMC

LDO

3 values

SEL_VMMC[1:0]

PDN_VMMC

Table 29.

Thermal threshold values

Description

Min

Typ

Max

Unit

Thermal Warning Threshold 1

Rising threshold

134

140

149

°C

Falling threshold

117

123

131

°C

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