WM8310GEB/V Wolfson Microelectronics, WM8310GEB/V Datasheet - Page 72

• 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

WM8310
15.11 MONITORING AND FAULT REPORTING
15.12 POWER MANAGEMENT REGISTER DEFINITIONS
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The DC-DC3 Buck Converter has a selectable overvoltage protection feature, controlled by
DC3_OVP. This affects the converter response when DC3 is enabled or when its output voltage is
increased. When the overvoltage protection is enabled, there is less overshoot in the output voltage,
but some oscillation may occur as the voltage settles. This function should only be enabled if steep
load transients are present on the output of DC-DC3 and if voltage overshoot is critical.
Each of the DC-DC Converters (1 to 4) and LDOs (1 to 10) is monitored for voltage accuracy and
fault conditions. An undervoltage condition is detected if the voltage falls below the required level by
more than a pre-determined tolerance. If an undervoltage condition occurs, then this is indicated
using the corresponding status bit(s) defined in Section 15.12.6. An undervoltage condition also
triggers an Undervoltage Interrupt (see Section 15.13). Additional actions to shut down the converter
or perform a Device Reset may also be selected.
The Internal LDO (LDO13) is also monitored for voltage accuracy and fault conditions. An
undervoltage condition in LDO13 is indicated using the INTLDO_UV_STS bit. This undervoltage
condition also causes an OFF transition to be scheduled, as described in Section 11.3.
DC-DC Converters 1 and 2 are monitored for overvoltage conditions. An overvoltage condition is set
if the voltage is more than 100mV above the required level. If an overvoltage condition occurs, then
this is indicated using the corresponding status bit(s). Note that there is no Interrupt or other
selectable response to an overvoltage condition.
The current draw on DC-DC Converters 1 and 2 can be monitored against user-programmable
thresholds in order to detect a high current condition. This feature is enabled using
DCm_HC_IND_ENA and the current threshold is set using DCm_HC_THR. Note that the high current
threshold is not the same as the maximum current capability of the DC-DC Converters, but is set
according to the application requirements. If a high current condition occurs, then this is indicated
using the corresponding status bit(s). A high current condition also triggers a High Current Interrupt
(see Section 15.13).
15.12.1 DC-DC CONVERTER AND LDO REGULATOR ENABLE
The Enable and Status register bits for the DC-DC Converters and LDO Regulators are defined in
Table 34.
R16464 (4050h)
DCDC Enable
R16465 (4051h)
LDO Enable
R16466 (4052h)
DCDC Status
R16467 (4053h)
LDO Status
Notes:
1.
2.
Table 34 DC Converter and LDO Regulator Control
ADDRESS
n is a number between 1 and 11 that identifies the individual LDO Regulator.
m is a number between 1 and 4 that identifies the individual DC-DC Converter.
10:0
10:0
BIT
3:0
3:0
DCm_ENA
LDOn_ENA
DCm_STS
LDOn_STS
LABEL
DEFAULT
0
0
0
0
DC-DCm Enable request
0 = Disabled
1 = Enabled
(Note that the actual status is indicated
in DCm_STS)
LDOn Enable request
0 = Disabled
1 = Enabled
(Note that the actual status is indicated
in LDOn_STS)
DC-DCm Status
0 = Disabled
1 = Enabled
LDOn Status
0 = Disabled
1 = Enabled
PP, December 2009, Rev 3.0
DESCRIPTION
Pre-Production
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