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WM8352 Datasheet(PDF) 167 Page - Wolfson Microelectronics plc |
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WM8352 Datasheet(HTML) 167 Page - Wolfson Microelectronics plc |
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167 / 336 page  Production Data WM8352 w PD, February 2011, Rev 4.4 167 17.7.8 INTERRUPTS AND FAULT PROTECTION 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 111. Note: If a battery is connected to the BATT pin, but the WM8352 is being powered from the Wall or USB supplies, then disconnection of the Wall or USB supply will cause the 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 111. 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. ADDRESS BIT LABEL DESCRIPTION R25 (19h) Interrupt Status 1 15 CHG_BATT_HOT_EINT Battery temp too hot. (Rising Edge triggered) Note: This bit is cleared once read. 14 CHG_BATT_COLD_EINT Battery temp too cold. (Rising Edge triggered) Note: This bit is cleared once read. 13 CHG_BATT_FAIL_EINT Battery fail. (Rising Edge triggered) Note: This bit is cleared once read. 12 CHG_TO_EINT Charger timeout. (Rising Edge triggered) Note: This bit is cleared once read. 11 CHG_END_EINT Charging final stage. (Rising Edge triggered) Note: This bit is cleared once read. 10 CHG_START_EINT Charging started. (Rising Edge triggered) Note: This bit is cleared once read. 9 CHG_FAST_RDY_EINT Indicates that the charger is ready to go into fast charge. (Rising Edge triggered) Note: This bit is cleared once read. 2 CHG_VBATT_LT_3P9_EINT Battery Voltage < 3.9 interrupt. (Rising Edge triggered) Note: This bit is cleared once read. 1 CHG_VBATT_LT_3P1_EINT Battery voltage < 3.1 interrupt. (Rising Edge triggered) Note: This bit is cleared once read. 0 CHG_VBATT_LT_2P85_EIN T Battery voltage < 2.85 interrupt. (Rising Edge triggered) Note: This bit is cleared once read. R33 (21h) Interrupt Status 1 mask 15:0 “IM_” + name of respective bit in R25 (19h) 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). Table 111 Battery Charger Interrupts |
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