WM8352
Production Data
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
Chip over 115°C temp limit.
(Rising Edge triggered)
R26 (1Ah)
2
SYS_CHIP_GT115_EINT
Interrupt
Status 2
Note: This bit is cleared once read.
Chip over 140°C temp limit.
(Rising Edge triggered)
1
SYS_CHIP_GT140_EINT
Note: This bit is cleared once read.
R34 (22h)
2:1
“IM_” + name of respective bit Each bit in R34 enables or masks the
in R26
corresponding bit in R26. The default
value for these bits is 0 (unmasked).
Interrupt
Status 2 Mask
Table 155 Temperature Sensing Interrupts
PD, February 2011, Rev 4.4
208
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
