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13892 データシート(PDF) 75 Page - Freescale Semiconductor, Inc |
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13892 データシート(HTML) 75 Page - Freescale Semiconductor, Inc |
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75 / 161 page  Analog Integrated Circuit Device Data Freescale Semiconductor 75 13892 FUNCTIONAL DEVICE OPERATION SUPPLIES Since the startup default values of the buck switchers are dependent on the state of the PUMS pin, the SWxHI bit settings will likewise be determined by the PUMS pin. The settings are aligned to the likely application ranges for use cases as given in the Defaults tables in Power Control System. The following tables define the SWxHI bit states after a startup event is completed, but can be reconfigured via the SPI if desired, if an alternate range is needed. Care should be taken when changing SWxHI bit to avoid unintended jumps in the switcher output. The SWxHI setting applies to Normal, Standby, and DVS set points for the corresponding switcher. Note that the following efficiency curves were measured with the MC13892 in a socket. 29 11101 1.325 1.825 30 11110 1.350 1.850 31 11111 1.375 1.850 59. Output range not available for SW1. SW1 output range is 0.600-1.375, therefore SW1HI = 1 does not apply to SW1. The SW1HI bit should always be set to 0. Table 48. SWxHI States for Power Up Defaults PUMS1 Ground Open VCOREDIG VCORE Ground Open PUMS2 Open Open Open Open Ground Ground SW1HI 0 0 0 0 0 0 SW2HI 0 0 0 0 1 1 SW3HI 0 0 0 0 1 1 SW4HI 1 1 1 1 1 1 Table 47. Buck Switchers (SW1, 2, 3, 4) Output Voltage Programmability Set point SWx[4:0] SWx Output, SWxHI = 0 (Volts) SWx Output (59), SWxHI = 1 (Volts) |
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