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SMM766FCR1 Datasheet(PDF) 3 Page - Summit Microelectronics, Inc. |
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SMM766FCR1 Datasheet(HTML) 3 Page - Summit Microelectronics, Inc. |
3 / 32 page SMM766 Preliminary Information Summit Microelectronics, Inc 2086 2.1 12/13/2005 3 GENERAL DESCRIPTION The SMM766 is a highly integrated and accurate power supply controller, monitor, and sequencer. Each device has the ability to automatically control, monitor and cascade sequence up to 6 power supplies. In addition, the SMM766 includes Sequence-Link a feature that allows for the seamless integration of other Sequence-Link devices to accommodate sequencing of up to 48 channels. The SMM766 can monitor the VDD input, the 12V input, two general- purpose analog inputs, and the internal temperature sensor. The SMM766 has four operating modes: power-on sequencing mode, monitor mode, supply margining mode using Active DC Output Control (ADOC TM), and power-off sequencing mode. Power-on sequencing is initiated by the rising edge of the PWR_ON pin. During power-on sequencing the SMM766 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. Cascade sequencing is the ability to hold off the next sequenced supply until the first supply reaches a programmed threshold. A programmable sequence termination timer can be set to disable all channels if the power-on sequence stalls. Once all supplies have sequenced on and the voltages are above the UV settings, the ADOC, if enabled, will bring the supply voltages to their nominal settings. 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 SMM766 enters monitor mode. In the monitor mode, the SMM766 starts the ADOC control of the supplies and adjusts the output voltage to the programmed setting under all load conditions, especially useful for supplies without sense lines. Typical converters have ±2% accuracy ratings for their output voltage; the ADOC feature of the SMM766 increases the accuracy to ±0.2% (using a ±0.1% external voltage reference). The part also 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 initiate a Fault- Triggered power-off or force-shutdown operation. While the SMM766 is in its monitoring mode, an I 2C command to margin the supply voltages can bring the part into margining mode. In margining mode the SMM766 can margin 6 supply voltages in any combination of nominal, high and low voltage settings using the ADOC feature, all to within ±0.2% using a ±0.1% external reference. The margin high and low voltage settings can range from 0.3V to VDD around the converters’ nominal output voltage setting depending on the specified margin range of the DC- DC converter. During this mode the HEALTHY output is always active and the RST# output is always inactive regardless of the voltage threshold limit settings and triggers. Furthermore, the triggers for power-off and force-shutdown are temporarily disabled. The power-off sequencing mode can only be entered while the SMM766 is in the monitoring mode. It can be initiated by either bringing the PWR_ON pin low, through I 2C control, or triggered by a channel exceeding its programmed thresholds. Once power- off is initiated, it will disable the ADOC function and sequence the PUP outputs off in the reverse order as power-on sequencing. To ensure cascading of the supplies during power-off sequencing all supplies will be monitored as they turn off. The sequence termination timer performs a forced-shutdown operation if power-off sequencing stalls. 1 2.5V 2.7V 1.8V 2.0V 1.5V VDD (+2.7V to +5.5V) or 12VIN ( +8V to +15V) 2 3 45 SEQUENCE POSITION 1.2V Figure 2 – Example power supply sequencing and system start-up initialization using the SMM766. Cascade sequencing ensures that all supplies in the previous sequence position are valid before the next channel is released. Using the SMM766 any order of supply sequencing can be applied. |
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