参数资料
型号: MC34708VM
厂商: Freescale Semiconductor
文件页数: 46/159页
文件大小: 0K
描述: IC POWER MANAGEMENT 206MAPBGA
标准包装: 160
应用: 通用
电源电压: 1.8 V ~ 4.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 206-LFBGA
供应商设备封装: 206-MAPBGA(13x13)
包装: 托盘
Functional Block Description
Table 32. Switching regulator Mode Control for Normal and Standby Operation
SWxMODE[3:0]
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Normal Mode
APS
PWM
PWM
Off
APS
Reserved
Reserved
Reserved
APS
PWM
Reserved
PFM
Standby Mode
Off
PWM
APS
Off
APS
Reserved
Reserved
Reserved
PFM
PFM
Reserved
PFM
In addition to controlling the operating mode in Standby, the voltage setting can be changed. The transition in voltage is handled
in a controlled slope manner, see Dynamic Voltage Scaling for details. Each regulator has an associated set of SPI bits for
Standby mode set points. By default, the Standby settings are identical to the non-standby settings which are initially defined by
PUMSx programming.
The actual operating mode of the Switching regulators as a function of the STANDBY pin is not reflected through the SPI. In other
words, the SPI will read back what is programmed in SWxMODE[3:0], not the actual state that may be altered as described
previously.
Two tables follow for mode control in the low power Off states. Note that a low power Off activated SWx should use the Standby
set point as programmed by SWxSTBY[4:0]. The activated regulator(s) will maintain settings for mode and voltage until the next
startup event. When the respective time slot of the startup sequencer is reached for a given regulator, its mode and voltage
settings will be updated the same as if starting out of the Off state (except switching regulators active through a low power Off
mode will not be off when the startup sequencer is started).
Table 33. Switching regulator Control In Memory Hold
SWxMHMODE
0
1
Memory Hold Operational Mode (45)
Off
PFM
Notes:
45. For Memory Hold mode, an activated SWx should use the
Standby set point as programmed by SWxSTBY[4:0].
Table 34. Switching regulator Control In User Off
SWxUOMODE
0
1
User Off Operational Mode (46)
Off
PFM
Notes:
46. For User Off mode, an activated SWx should use the Standby
set point as programmed by SWxSTBY[4:0].
In normal steady state operating mode, the SWxPWGD pin is high. When the SWx set point is changed to a higher or lower set
point, the SWxPWGD pin will go low and will go high again when the higher/lower set point is reached.
MC34708
Analog Integrated Circuit Device Data ?
Freescale Semiconductor
46
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