wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 166

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

WM8351
w
17.7.8
The battery charger can raise a first-level interrupt, CHG_INT (see Section 24) to report status and
fault conditions to the host processor. The CHG_INT interrupt is the logical OR of all the second-level
interrupts described in Table 110.
Note: If a battery is connected to the BATT pin, but the WM8351 is being powered from the Wall or
USB
CHG_VBATT_LT_3P1_EINT and CHG_VBATT_LT_2P85_EINT interrupts to be set.
The CHG_VBATT_LT_3P1_EINT and CHG_VBATT_LT_2P85_EINT interrupts can be masked by
setting the associated mask bits defined in Table 110.
Alternatively, the EXT_USB_FB_EINT and/or EXT_WALL_FB_EINT interrupts (see Section 17.5)
can be used to validate the Battery Undervoltage interrupts - if one of the External Feedback
interrupts is set at the same time as the Battery Undervoltage interrupts, then the Battery
Undervoltage interrupts should be ignored.
R25 (19h)
Interrupt
Status 1
R33 (21h)
Interrupt
Status 1 mask
Table 110 Battery Charger Interrupts
ADDRESS
supplies,
INTERRUPTS AND FAULT PROTECTION
15:0
then
BIT
15
14
13
12
11
10
9
2
1
0
disconnection
CHG_BATT_HOT_EINT
CHG_BATT_COLD_EINT
CHG_BATT_FAIL_EINT
CHG_TO_EINT
CHG_END_EINT
CHG_START_EINT
CHG_FAST_RDY_EINT
CHG_VBATT_LT_3P9_EINT
CHG_VBATT_LT_3P1_EINT
CHG_VBATT_LT_2P85_EIN
T
“IM_” + name of respective bit
in R25 (19h)
LABEL
of
the
Wall
or
Battery temp too hot.
(Rising Edge triggered)
Note: This bit is cleared once read.
Battery temp too cold.
(Rising Edge triggered)
Note: This bit is cleared once read.
Battery fail.
(Rising Edge triggered)
Note: This bit is cleared once read.
Charger timeout.
(Rising Edge triggered)
Note: This bit is cleared once read.
Charging final stage.
(Rising Edge triggered)
Note: This bit is cleared once read.
Charging started.
(Rising Edge triggered)
Note: This bit is cleared once read.
Indicates that the charger is ready to go
into fast charge.
(Rising Edge triggered)
Note: This bit is cleared once read.
Battery Voltage < 3.9 interrupt.
(Rising Edge triggered)
Note: This bit is cleared once read.
Battery voltage < 3.1 interrupt.
(Rising Edge triggered)
Note: This bit is cleared once read.
Battery voltage < 2.85 interrupt.
(Rising Edge triggered)
Note: This bit is cleared once read.
Mask bits for battery charger interrupts
Each of these bits masks the respective
bit in R25 when it is set to 1 (e.g.
CHG_FAST_RDY in R25 does not trigger
a CHG_INT interrupt when
IM_CHG_FAST_RDY in R33 is set).
USB
supply
DESCRIPTION
PD, June 2009, Rev 4.1
will
Production Data
cause
166
the