WM8352 datasheet(208/336 Pages) WOLFSON

208 / 336 page

WM8352

Production Data

PD, February 2011, Rev 4.4

208

25 TEMPERATURE SENSING

25.1 CHIP TEMPERATURE MONITORING

The WM8352 has a built-in sensor to monitor its internal temperature, with two levels of over-

temperature protection.

When the device temperature exceeds the thermal warning temperature, the WM8352 raises a

SYS_CHIP_GT115_EINT interrupt. If the chip temperature continues to rise, and exceeds the

thermal shutdown temperature, the SYS_CHIP_GT140_EINT interrupt is set and the device shuts

down. After a thermal shutdown, the WM8352 can only restart after its temperature has fallen below

the restart temperature.

The associated register fields are defined in Table 155.

ADDRESS

BIT

LABEL

DESCRIPTION

R26 (1Ah)

Interrupt

Status 2

SYS_CHIP_GT115_EINT

Chip over 115°C temp limit.

(Rising Edge triggered)

Note: This bit is cleared once read.

SYS_CHIP_GT140_EINT

Chip over 140°C temp limit.

(Rising Edge triggered)

Note: This bit is cleared once read.

R34 (22h)

Interrupt

Status 2 Mask

2:1

“IM_” + name of respective bit

in R26

Each bit in R34 enables or masks the

corresponding bit in R26. The default

value for these bits is 0 (unmasked).

Table 155 Temperature Sensing Interrupts

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