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WM8321GEFL/RV 参数 Datasheet PDF下载

WM8321GEFL/RV图片预览
型号: WM8321GEFL/RV
PDF下载: 下载PDF文件 查看货源
内容描述: 处理器电源管理子系统 [Processor Power Management Subsystem]
分类和应用:
文件页数/大小: 253 页 / 1578 K
品牌: WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
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WM8321  
Production Data  
15.4 OPERATING MODE CONTROL  
15.4.1 DC-DC SYNCHRONOUS BUCK CONVERTERS  
The DC-DC Converters DC-DC1 - DC-DC4 can be configured to operate in four different operating  
modes. The operating modes are summarised in Table 30. For more detailed information on the DC-  
DC (Buck) Converter operating modes, see Section 15.14.2.  
DC-DC CONVERTER  
OPERATING MODE  
DESCRIPTION  
Forced Continuous Conduction  
Mode (FCCM)  
High performance mode for all static and transient load  
conditions.  
Auto Mode: Continuous /  
Discontinuous Conduction with  
Pulse-Skipping Mode (CCM/DCM  
with PS)  
High efficiency mode for all static and transient load  
conditions. Performance may be less than FCCM mode for  
heavy load transients.  
Hysteretic Mode  
High efficiency mode for light static and light transient loads  
only. Maximum load current is restricted; output voltage ripple  
is increased.  
LDO Mode  
Power saving mode for light loads only. High efficiency for  
ultra light loads. Low current soft-start control.  
Table 30 DC-DC Synchronous Buck Converter Operating Modes  
The operating mode of the DC-DC Converters in the ON power state is selected using the  
DCm_ON_MODE register fields. The operating mode of the DC-DC Converters in the SLEEP power  
state is selected using the DCm_SLP_MODE register fields.  
When changing the operating mode of the DC-DC Converters in preparation for an increased load, a  
set-up time of 100s should be allowed for the operating mode to be established before applying the  
new load.  
Note that the operating mode of the DC-DC Converters may also be controlled by the Hardware  
Control inputs. The Hardware Control inputs are alternate functions supported via GPIO. See  
Section 15.8 for details of Hardware Control.  
15.4.2 LDO REGULATORS  
The LDO Regulators LDO1 - LDO10 can be configured to operate in Normal operating mode or in  
Low Power mode.  
The operating mode of the LDO Regulators in the ON power state is selected using the  
LDOn_ON_MODE register fields. The operating mode of the LDO Regulators in the SLEEP power  
state is selected using the LDOn_SLP_MODE register fields.  
For the standard LDOs, LDO1 - LDO6, two different Low Power modes are provided, offering limited  
load current capability and reduced quiescent current. When Low Power mode is selected in the ON  
or SLEEP power states, then the LDOn_LP_MODE register bits determine which Low Power mode is  
selected.  
Note that the operating mode and output voltage of the LDO Regulators may also be controlled by the  
Hardware Control inputs. The Hardware Control inputs are alternate functions supported via GPIO.  
See Section 15.8 for details of Hardware Control.  
15.5 OUTPUT VOLTAGE CONTROL  
15.5.1 DC-DC SYNCHRONOUS BUCK CONVERTERS  
The output voltage of the DC-DC Converters 1-4 in the ON power state is selected using the  
DCm_ON_VSEL register fields. The output voltage of these converters in the SLEEP power state is  
selected using the DCm_SLP_VSEL register fields.  
PD, February 2012, Rev 4.0  
64  
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