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WM8321 数据表(PDF) 129 Page - Wolfson Microelectronics plc |
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WM8321 数据表(HTML) 129 Page - Wolfson Microelectronics plc |
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129 / 253 page  Production Data WM8321 w PD, February 2012, Rev 4.0 129 A summary of the WM8321 Resets is contained in Table 76 . RESET TYPE RESET CONDITION DESCRIPTION RESPONSE AUTOMATIC RECOVERY System Reset Power Sequence Failure DC Converters, LDOs or CLKOUT circuits have failed to start up within the permitted time. See Section 11.3. Assert RESET ¯¯¯¯¯¯ pin. Select OFF state. If the Reset Condition is VPMIC (LDO12) undervoltage, then the WM8321 enters the BACKUP state. No Device overtemperature An overtemperature condition has been detected. See Section 26. No PVDD undervoltage (1) PVDD is less than the user- selectable threshold SYSLO_THR and SYSLO_ERR_ACT is configured to select OFF in this condition. See Section 24.4. No PVDD undervoltage (2) PVDD is less than the SHUTDOWN voltage. See Section 24.4. No Software OFF request OFF has been commanded by writing CHIP_ON = 0. See Section 11.3 No VPMIC (LDO12) undervoltage The WM8321 supply voltage is less than the System Reset threshold. See Section 24.4. No Device Reset Watchdog timeout Watchdog timer has expired and the selected response is to generate a Device Reset. See Section 25. Assert RESET ¯¯¯¯¯¯ pin. Shutdown and restart the WM8321. Reset Register map (Note the RTC and software scratch registers are not reset.) Yes Hardware Reset The RESET ¯¯¯¯¯¯ pin has been pulled low by an external source. See Section 24.2. Yes Converter (LDO or DC- DC) Undervoltage An undervoltage condition has been detected and the selected response is “Shut down system (Device Reset)” See Section 15. Yes Software Reset Software Reset Software Reset has been commanded by writing to Register 0000h. See Section 12.5. Assert RESET ¯¯¯¯¯¯ pin. Shutdown and restart the WM8321. See Section 24.3 for configurable options regarding the Register Map contents. Yes Power On Reset Power On Reset The WM8321 supply voltage is less than the Power-On Reset (POR) threshold. See Section 24.4. The WM8321 is in the NO POWER state. All register contents are lost. No Table 76 Resets Summary In the cases where Automatic Recovery is supported (as noted in Table 76 ), the WM8321 will re-start the WM8321 following the Reset, and return the device to the ON state. The particular Reset condition which caused the return to the ON state will be indicated in the “ON Source” register - see Section 11.3. Note that, if a Watchdog timeout or Converter undervoltage fault persists, a maximum of 6 Device Resets will be attempted to initiate the start-up sequence. Similarly, a maximum of 6 Software Resets is permitted. If these limits are exceeded, the WM8321 will remain in the OFF state until the next valid ON state transition event occurs. The WM8321 asserts the RESET ¯¯¯¯¯¯ low as soon as the device begins the shutdown sequence. RESET ¯¯¯¯¯¯ is held low for the duration of the shutdown sequence and is held low in the OFF state. In the cases where Automatic Recovery is supported, RESET ¯¯¯¯¯¯ is automatically cleared (high) after successful completion of the startup sequence. The duration of the RESET ¯¯¯¯¯¯ low period after the startup sequence has completed is governed by the RST_DUR register field described in Section 11.7. |
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