WM8310 datasheet(73/291 Pages) WOLFSON

73 / 291 page

Pre-Production

WM8310

PP, May 2012, Rev 3.1

When a Hardware Control input is assigned to a DC-DC Buck Converter (DC-DC1, DC-DC2 or DC-

DC3), and is asserted, the operating mode and output voltage of the relevant DC-DC Converter is

determined by the DCm_HWC_VSEL and DCm_HWC_MODE fields; this takes precedence over the

normal ON or SLEEP settings.

Note that the Hardware Control input can be used to disable a DC-DC Buck Converter if required, by

setting DCm_HWC_MODE = 01.

When a Hardware Control input is assigned to the DC-DC4 Boost Converter, and is asserted, the

Converter is controlled as determined by the DC4_HWC_MODE field; this takes precedence over the

normal ON or SLEEP settings. The available options are to disable the Converter, or to remain under

control of DC4_ENA.

When a Hardware Control input is assigned to LDO Regulators 1-10, and is asserted, the operating

mode and output voltage of the relevant LDO Regulators is determined by the LDOn_HWC_VSEL

and LDOn_HWC_MODE fields; this takes precedence over the normal ON or SLEEP settings.

Note that, for the standard LDOs (LDO1 - LDO6), when Low Power Mode is selected

(LDOn_HWC_MODE = 00 or 10), then the Low Power mode type is determined by the

LDOn_LP_MODE register bits.

When a Hardware Control input is assigned to the External Power Enable (EPE) outputs, and is

asserted, the relevant EPE outputs are controlled as determined by the EPEn_HWC_ENA field; this

takes precedence over the normal ON or SLEEP settings. The available options are to de-assert the

EPE, or for the EPE to remain under control of EPEn_ENA.

15.10 FAULT PROTECTION

Each of the DC-DC Buck Converters (1 to 3) is monitored for voltage accuracy and fault conditions.

An undervoltage condition is set if the output voltage falls below the required level by more than the

applicable undervoltage margin, as specified in Section 7.1.

The DC-DC4 Boost Converter is monitored for voltage accuracy and fault conditions. The voltage at

ISINK1 or ISINK2 is monitored as an indicator of an overcurrent condition.

Each LDO Regulator (1 to 10) is monitored for voltage accuracy and fault conditions. An undervoltage

condition is set if the output voltage falls below the required level by more than the undervoltage

margin, as specified in Section 7.4.

The DCm_ERR_ACT and LDOn_ERR_ACT fields configure the fault response to an Undervoltage

condition. An Interrupt is always triggered under this condition (see Section 15.13); additional action

can also be selected independently for each converter / regulator. The options are to ignore the fault,

shut down the converter, or to shut down the system. To prevent false alarms during short current

surges, faults are only signalled if the fault condition persists.

If a fault condition is detected, and the selected response is to shut down the converter or regulator,

then the associated _ENA and _STS fields are reset to 0, as described in Section 15.2.

If a fault condition is detected, and the selected response is to shut down the system, then a Device

Reset is triggered, as described in Section 24.1, forcing a transition to the OFF state. The WM8310

will automatically return to the ON state after performing the Device Reset.

Note that, if the fault condition persists, then a maximum of 6 Device Resets will be attempted to

initiate the start-up sequence. If the sequence fails more than 6 times, the WM8310 will remain in the

OFF state until the next valid ON state transition event occurs.

Note that the DC-DC4 Boost Converter will not be automatically enabled following a Device Reset;

this must be re-enabled using the DC4_ENA bit if required.

Note that DC-DC1 and DC-DC2 overvoltage and high current conditions can be detected and

reported as described in Section 15.11. The DCm_ERR_ACT fields have no relation to these

conditions.

WM8310 Datasheet(PDF) 73 Page - Wolfson Microelectronics plc

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