wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 109

• Manufacturer Part Number: wm8350
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
w
R31 (1Fh)
Comparator
Interrupt
Status
R39 (27h)
Comparator
Interrupt
Status Mask
Table 55 Wake-Up Interrupts
14.3.2
The WM8350 power supply blocks can be commanded to start up according to a defined sequence
when the WM8350 is commanded into the ACTIVE state. This sequence comprises fourteen
timeslots, where the enabling of each DC-DC converter, LDO voltage regulator and the current limit
switch is associated with one timeslot. In order to minimise supply in-rush current at power-up time,
the start-up of these power supply blocks should be staggered in time by the use of this feature.
The WM8350 proceeds from one time slot to the next after a delay of approximately 1.28ms,
provided that all power supply blocks started up in the current time slot (if any) have reached 90% of
their programmed output voltage. See Section 14.3.4 for details of the WM8350 behaviour if any
power supply block fails to achieve 90% of its programmed output voltage.
ADDRESS
POWER-UP SEQUENCING
BIT
6:0
6
5
4
3
2
1
0
WKUP_OFF_STATE_EINT
WKUP_HIB_STATE_EINT
WKUP_CONV_FAULT_EINT
WKUP_WDOG_RST_EINT
WKUP_GP_PWR_ON_EINT
WKUP_ONKEY_EINT
WKUP_GP_WAKEUP_EINT
“IM_” + name of respective
bit in R31
LABEL
Indicates that the chip started from the
OFF state.
(Rising Edge triggered)
Note: This bit is cleared once read.
Indicated the chip started up from the
hibernate state.
(Rising Edge triggered)
Note: This bit is cleared once read.
Indicates the wakeup was caused by a
converter fault leading to the chip being
reset.
(Rising Edge triggered)
Note: This bit is cleared once read.
Indicates the wakeup was caused by a
watchdog heartbeat being missed, and
hence the chip being reset.
(Rising Edge triggered)
Note: This bit is cleared once read.
has been pressed for longer than
specified time.
(Rising Edge triggered)
Note: This bit is cleared once read.
ON key has been pressed for longer than
specified time.
(Rising Edge triggered)
Note: This bit is cleared once read.
has been pressed for longer than
specified time.
(Rising Edge triggered)
Note: This bit is cleared once read.
Interrupt mask.
0 = Do not mask interrupt.
1 = Mask interrupt.
Each bit in R39 enables or masks the
corresponding bit in R31. The default
value for these bits is 0 (unmasked).
PWR_ON (Alternate GPIO function) pin
WAKEUP (Alternate GPIO function) pin
DESCRIPTION
PD, June 2009, Rev 4.1
WM8350
109