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WM8321 数据表(PDF) 35 Page - Wolfson Microelectronics plc |
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WM8321 数据表(HTML) 35 Page - Wolfson Microelectronics plc |
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35 / 253 page  Production Data WM8321 w PD, February 2012, Rev 4.0 35 TRANSITION SEQUENCE EVENT NOTES ON SOURCE / OFF SOURCE ON (see note 1) RTC alarm An ON request occurs if the RTC Alarm occurs in the OFF power state. See Section 20. ON_TRANS, ON_RTC_ALM GPIO ON request Requires a GPIO to be configured as “Power On request” or “Power On/Off request”. See Section 21. ON_TRANS, ON_GPIO ON ¯¯ pin request Requires the ON ¯¯ pin to be configured to generate ON request. See Section 11.6. ON_TRANS, ON_ON_PIN WAKE Software WAKE Writing CHIP_SLP = 0. See Table 2. ON_SW_REQ Watchdog timeout Requires the Watchdog to be configured to generate WAKE request. See Section 25. ON_WDOG_TO RTC alarm A WAKE request occurs if the RTC Alarm occurs in the SLEEP power state. See Section 20. ON_RTC_ALM GPIO WAKE request Requires a GPIO to be configured as “Sleep/Wake request”. See Section 21. ON_GPIO PVDD undervoltage Requires the PVDD monitor circuit to be configured to generate WAKE request. See Section 24.4. ON_SYSLO ON ¯¯ pin request Requires the ON ¯¯ pin to be configured to generate WAKE request. See Section 11.6. ON_ON_PIN OFF Watchdog timeout Requires the Watchdog to be configured to generate Device Reset. See Section 25. RESET_WDOG (See note 2) Hardware Reset See Section 24. RESET_HW (See note 2) Software Reset See Section 24. RESET_SW (See note 2) Power Management Undervoltage Reset Configurable option for each LDO/DC-DC converter. See Section 15. RESET_CNV_UV (See note 2) Software OFF request Writing CHIP_ON = 0. See Table 2. OFF_SW_REQ ON pin request Requires the ON ¯¯ pin to be configured to generate OFF request. See Section 11.6. OFF_ON_PIN Thermal shutdown See Section 26. OFF_THERR PVDD undervoltage Requires the PVDD monitor circuit to be configured to generate OFF request. See Section 24.4. OFF_PVDD PVDD shutdown PVDD has fallen below the SHUTDOWN threshold. See Section 24.4. OFF_PVDD GPIO OFF request Requires a GPIO to be configured as “Power On/Off request”. See Section 21. OFF_GPIO Power Sequence failure DC-DC converters, LDOs or CLKOUT circuits have failed to start up within the permitted time. OFF_PWR_SEQ Internal LDO error Error condition detected in LDO13 OFF_INTLDO_ERR SLEEP Software SLEEP request Writing CHIP_SLP = 1. See Table 2. See note 3 GPIO SLEEP request Requires a GPIO to be configured as “Sleep request” or “Sleep/Wake request”. See Section 21. See note 3 Table 3 Power State Transition Events Notes: 1. An ON sequence is only permitted when the supply voltage PVDD exceeds a programmable threshold VSYSOK. See Section 24.4 for details of PVDD voltage monitoring. 2. These Reset conditions result in an OFF transition followed by an ON transition. These events are recorded as Reset events in the ‘ON Source’ register. 3. SLEEP events are not recorded in the ‘OFF Source’ register. |
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