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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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13892 датащи(PDF) 66 Page - Freescale Semiconductor, Inc |
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13892 датащи(HTML) 66 Page - Freescale Semiconductor, Inc |
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66 / 161 page  Analog Integrated Circuit Device Data 66 Freescale Semiconductor 13892 FUNCTIONAL DEVICE OPERATION OPERATING MODES For regulators with internal pass devices and general outputs, the previous table can be simplified. BUCK SWITCHERS Operational modes of the Buck switchers can be controlled by direct SPI programming, altered by the state of the STANDBY pins, by direct state machine influence, or by load current magnitude when so configured. Available modes include PWM with No Pulse Skipping (PWM), PWM with Pulse Skipping (PWMPS), Pulse Frequency Mode (PFM), and Off. The transition between the two modes PWMPS and PFM can occur automatically, based on the load current. Therefore, no specific control is required to put the switchers in a Low Power mode. When the buck switchers are not configured in the Auto mode, power savings may be achieved by disabling switchers when not needed, or running them in PFM mode if loading conditions are light enough. SW1, SW2, SW3, and SW4 can be configured for mode switching with STANDBY or autonomously based on load current with adaptive mode control (Auto). Additionally, provisions are made for maintaining PFM operation in USEROFF and MEMHOLD modes to support state retention for faster startup from the low power Off modes for Warm Start or Warm Boot. Table 34 summarizes the Buck switcher programmability for Normal and Standby modes. Table 32. LDO Regulator Control (External Pass Device LDOs) VxEN VxMODE VxSTBY STANDBY Regulator Vx 0 X X X Off 1 0 0 X On 1 1 0 X Low Power 1 X 1 0 On 1 0 1 1 Off 1 1 1 1 Low Power Notes 47. This table is valid for regulators with an external pass device 48. STANDBY refers to a Standby event as described earlier Table 33. LDO Regulator Control (Internal Pass Device LDOs) VxEN VxSTBY STANDBY Regulator Vx 0 X X Off 1 0 X On 1 1 0 On 1 1 1 Off Notes 49. This table is valid for regulators with an internal pass device 50. STANDBY refers to a Standby event as described earlier Table 34. Switcher Mode Control for Normal and Standby Operation SWxMODE[3:0] Normal mode(51) Standby Mode(51) 0000 Off Off 0001 PWM Off 0010 PWMPS Off 0011 PFM Off 0100 Auto Off 0101 PWM PWM 0110 PWM Auto 0111 NA NA 1000 Auto Auto 1001 PWM PWMPS 1010 PWMPS PWMPS 1011 PWMPS Auto 1100 Auto PFM 1101 PWM PFM |
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