WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 89

• 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
15.14 POWER GOOD INDICATION
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The WM8310 can indicate the status of the DC-DC Converters and LDO Regulators via a GPIO pin
configured as a “PWR_GOOD” output (see Section 21).
Each DC-DC Converter and LDO Regulator to be monitored in this way must be individually enabled
as an input to the PWR_GOOD function using the register bits defined in Table 44.
When a GPIO pin is configured as a “PWR_GOOD” output, this signal is asserted when all selected
DC-DC Converters and LDO Regulators are operating correctly. If any of the enabled DC-DC
Converters or LDO Regulators is undervoltage, then the PWR_GOOD will be de-asserted. In this
event, the host processor should read the Undervoltage Interrupt fields to determine which DC-DC
Converter or LDO Regulator is affected.
Note that an Undervoltage condition may lead to a Converter being switched off automatically. In this
case, the disabled Converter will not indicate the fault condition via PWR_GOOD. Accordingly, the
PWR_GOOD signal may not be a reliable output in cases where the WM8310 is configured to shut
down any Converters automatically under Undervoltage conditions. It is recommended that the host
processor should read the Undervoltage Interrupts in response to PWR_GOOD being de-asserted.
The host processor can then initiate the most appropriate response.
R16526 (408Eh)
Power Good
Source 1
R16527 (408Fh)
Power Good
Source 2
ADDRESS
BIT
3
2
1
0
9
8
7
6
5
4
DC4_OK
DC3_OK
DC2_OK
DC1_OK
LDO10_OK
LDO9_OK
LDO8_OK
LDO7_OK
LDO6_OK
LDO5_OK
LABEL
DEFAULT
0
1
1
1
1
1
1
1
1
1
DC-DC4 status selected as an input
to PWR_GOOD
0 = Disabled
1 = Enabled
DC-DC3 status selected as an input
to PWR_GOOD
0 = Disabled
1 = Enabled
DC-DC2 status selected as an input
to PWR_GOOD
0 = Disabled
1 = Enabled
DC-DC1 status selected as an input
to PWR_GOOD
0 = Disabled
1 = Enabled
LDO10 status selected as an input to
PWR_GOOD
0 = Disabled
1 = Enabled
LDO9 status selected as an input to
PWR_GOOD
0 = Disabled
1 = Enabled
LDO8 status selected as an input to
PWR_GOOD
0 = Disabled
1 = Enabled
LDO7 status selected as an input to
PWR_GOOD
0 = Disabled
1 = Enabled
LDO6 status selected selected as an
input to PWR_GOOD
0 = Disabled
1 = Enabled
LDO5 status selected as an input to
PWR_GOOD
0 = Disabled
1 = Enabled
PP, December 2009, Rev 3.0
DESCRIPTION
WM8310
89