WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 159

• Manufacturer Part Number: WM8310GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 169BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8310GEB/V

• Supply Voltage: 7V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 11
• Digital Ic Case Style: BGA
• No. Of Pins: 169
• No. Of Regulated Outputs: 13
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Pre-Production
26 TEMPERATURE SENSING
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The WM8310 provides temperature monitoring as status information and also for self-protection of
the device. Temperature monitoring is always enabled in the ON and SLEEP states.
The thermal warning temperature can be set using the THW_TEMP register field. The thermal
warning hysteresis ensures that the THW_TEMP is not reset until the device temperature has
dropped below the threshold by a suitable margin. The extent of the hysteresis can be selected using
the THW_HYST register field.
The Thermal Warning condition can be read using the THW_STS register bit. An overtemperature
condition causes the thermal warning interrupt (TEMP_THW_CINT) to be set. The thermal warning
interrupt is also set when the overtemperature condition clears, ie. when the device has returned to
its normal operating limits.
The thermal shutdown temperature is set at a fixed level. If a thermal shutdown condition is detected
whilst in the ON or SLEEP states, then a System Reset is triggered, as described in Section 24.1,
forcing a transition to the OFF state.
The temperature sensing circuit is configured and monitored using the register fields described in
Table 105.
R16386
(4002h)
R16397
(400Dh)
Table 105 Temperature Sensing Control
The thermal warning interrupt event is indicated by the TEMP_THW_CINT register field. This
secondary interrupt triggers a primary Thermal Interrupt, TEMP_INT (see Section 23). This can be
masked by setting the mask bit as described in Table 106.
R16401
(4011h)
Interrupt Status
1
R16410
(4019h)
Interrupt Status
1 Mask
Table 106 Thermal Interrupts
ADDRESS
ADDRESS
BIT
1:0
15
3
BIT
1
1
THW_HYST
THW_TEMP
[1:0]
THW_STS
LABEL
TEMP_THW_CINT
IM_TEMP_THW_CINT
LABEL
DEFAULT
10
1
0
Thermal Warning hysteresis
0 = 8 degrees C
1 = 16 degrees C
Thermal Warning temperature
00 = 90 degrees C
01 = 100 degress C
10 = 110 degrees C
11 = 120 degrees C
Thermal Warning status
0 = Normal
1 = Overtemperature Warning
(warning temperature is set by
THW_TEMP)
Thermal Warning interrupt
(Rising and Falling Edge triggered)
Note: Cleared when a ‘1’ is written.
Interrupt mask.
0 = Do not mask interrupt.
1 = Mask interrupt.
Default value is 1 (masked)
DESCRIPTION
PP, December 2009, Rev 3.0
DESCRIPTION
WM8310
159