STW4810 datasheet(39/79 Pages) STMICROELECTRONICS

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Functional description

STw4810

38/78

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, VDDOK

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

Table 18). 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 of the thermal sensor.

●

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

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

is under the thermal shutdown threshold and after a new startup phase.

Figure 11.

Thermal threshold temperatures for ‘it_warn’ bit and VDDOK ball

Table 30.

Thermal threshold values

Description

Min

Typ

Max

Unit

Thermal warning threshold

Rising threshold

134

140

149

°C

Falling threshold

117

123

131

°C

Thermal shutdown threshold

Threshold

149

155

164

°C

‘it_warn’ bit

VDDOK ball

Temperature

Rising warning

threshold

Shutdown

threshold

All supplies

are turn “OFF”

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