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SMS66FR15 데이터시트(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMS66FR15 데이터시트(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 26 page SMS66 Preliminary Information Summit Microelectronics, Inc 2070 1.0 7/16/03 2 GENERAL DESCRIPTION The SMS66 is a highly integrated power supply controller, monitor and sequencer. It has the ability to control, monitor and sequence up to six power supplies. Also, the SMS66 can monitor the VDD input, the 12V input, two general-purpose analog inputs and the internal temperature sensor. The SMS66 has three operating modes: Power-on sequencing mode, monitor mode, and Power-off sequencing mode. Power-on sequencing can be initiated via the PWR_ON/OFF pin or I 2C control. In this mode, the SMS66 will sequence the power supply channels on in any order by activating the PUP outputs and monitoring the respective converter voltages to ensure cascading of the supplies. A programmable sequence termination timer can be set to disable all channels if the Power-on sequence stalls. During this mode the HEALTHY output will remain inactive and the RST output will remain active. Once the Power-on sequencing mode is complete, the SMS66 enters monitor mode. In the monitor mode the SMS66 supervises the supplies to within 5mV, and enables the triggering of outputs by monitored fault conditions. The 10-bit ADC cycles through all 11 channels every 2ms and checks the conversions against the programmed threshold limits. The results can be used to trigger RST, HEALTHY and FAULT outputs as well as to trigger a Power-off or a Force Shutdown operation. The Power-off sequencing mode can only be entered while the SMS66 is in the monitoring mode. It can be initiated by either bringing the PWR_ON/OFF pin inactive, through I 2C control or triggered by a channel exceeding its programmed thresholds. Once Power- off is initiated it will disable the Active DC Control and sequence the PUP outputs off in either the same or reverse order as Power-on sequencing and monitor the supply voltages to ensure cascading of the supplies as they turn off. The sequence termination timer can be programmed to immediately disable all channels if the Power-off sequencing stalls. The RST output will remain active throughout this mode while the HEALTHY output remains inactive. Figure 2 – Example Power Supply Sequencing and System Start-up Initialization using the SMS66. Any order of supply sequencing can be applied using the SMS66 with very accurate monitoring and supervisory functions. 2.5V 2.7V 1.8V 2.0V 1.5V VDD (+2.7V to +5.5V) or 12VIN ( +8V to +15V) RST# t PRTO t DPONC t DPONB t DPOND t DPONE t DPONF t DPONA |
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