wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 133

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
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The DC-DC Converters and the LDO Regulators have a first-level interrupt, UV_INT (see
Section 24). This comprises second-level interrupts from each of the DC-DC Converters and the
LDO Regulators.
Each DC-DC Converter has a dedicated second-level interrupt which indicates an under-voltage
condition. These can be masked by setting the applicable mask bit as defined in Table 79.
R28 (1Ch)
Under Voltage
Interrupt Status
R36 (24h)
Under Voltage
Interrupt Mask
Note: there is no over-current fault condition for converter 2.
Table 79 DC-DC Converter Interrupts
The status of the DC-DC Converters can be indicated and monitored externally via a GPIO pin
configured as /VCC_FAULT (see Section 20). When a GPIO pin is configured as /VCC_FAULT
output, a logic low level on this pin indicates that there is a fault condition on one of the LDO
Regulators, DC-DC Converters, or the Current Limit switch.
The /VCC_FAULT output is configurable by the control fields in Register R215. The fields described
in Table 80 determine which of the DC-DCs contribute to the /VCC_FAULT indication. An
undervoltage or overvoltage condition on any unmasked DC-DC Converter will cause the
/VCC_FAULT output to be set to logic low.
R215 (D7h)
VCC_FAULT
Table 80 DC Converter /VCCFAULT mask bits
ADDRESS
ADDRESS
as in
BIT
R28
BIT
3
2
1
0
3
2
1
0
DC4_FAULT
DC3_FAULT
DC2_FAULT
DC1_FAULT
UV_DC4_EINT
UV_DC3_EINT
UV_DC2_EINT
UV_DC1_EINT
“IM_” + name of respective
bit in R28
LABEL
LABEL
DEFAULT
0
0
DCDC4 Under-voltage interrupt.
(Rising Edge triggered)
Note: This bit is cleared once read.
DCDC3 Under-voltage interrupt.
(Rising Edge triggered)
Note: This bit is cleared once read.
DCDC2 Under-voltage interrupt.
(Rising Edge triggered)
Note: This bit is cleared once read.
DCDC1 Under-voltage interrupt.
(Rising Edge triggered)
Note: This bit is cleared once read.
Mask bits for DC-DC converter under-
voltage interrupts
Each of these bits masks the respective
bit in R28 when it is set to 1 (e.g.
UV_DC1_EINT in R28 does not trigger a
UV_INT interrupt when
IM_UV_DC1_EINT in R36 is set).
DCDC4 fault mask for the
/VCC_FAULT
0 = don't mask converter fault
1 = mask converter fault
DCDC3 fault mask for the
/VCC_FAULT
0 = don't mask converter fault
1 = mask converter fault
DCDC2 fault mask for the
/VCC_FAULT
0 = don't mask converter fault
1 = mask converter fault
DCDC1 fault mask for the
/VCC_FAULT
0 = don't mask converter fault
1 = mask converter fault
DESCRIPTION
DESCRIPTION
PD, June 2009, Rev 4.1
WM8351
133