WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 71

• Manufacturer Part Number: WM8310GEB/V
• Description: POWER MANAGEMENT SUBSYSTEM, 169BGA
• Manufacturer: Wolfson Microelectronics

Specifications of WM8310GEB/V

• Supply Voltage: 7V
• No. Of Step-down Dc - Dc Converters: 4
• No. Of Ldo Regulators: 11
• Digital Ic Case Style: BGA
• No. Of Pins: 169
• No. Of Regulated Outputs: 13
• Operating Temperature Range: -40°C To
• Rohs Compliant: Yes
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Pre-Production
15.10 FAULT PROTECTION
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When a Hardware Control input is assigned to DC-DC Buck Converters 1-3, and is asserted, the
operating mode and output voltage of the relevant DC-DC Converters 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.
Each of the DC-DC Buck Converters 1-3 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 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 7 attempts will be made to initiate the
start-up sequence.
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.
PP, December 2009, Rev 3.0
WM8310
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