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SMM465FR02 Datasheet(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMM465FR02 Datasheet(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 30 page SMM465 Preliminary Information Summit Microelectronics, Inc 2085 1.1 05/27/04 2 GENERAL DESCRIPTION The SMM465 is a highly integrated and accurate power supply controller, monitor and sequencer. It has the ability to automatically control, monitor and cascade sequence up to four power supplies. Also, the SMM465 can monitor the VDD input, the 12V input, two general-purpose analog inputs and the internal temperature sensor. The SMM465 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 can be initiated via the PWR_ON/OFF pin or I 2C control. In this mode, the SMM465 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 Active DC Control, 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 SMM465 enters monitor mode. In the monitor mode, the SMM465 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 Active DC Output Control feature of the SMM465 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 9 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. While the SMM465 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 SMM465 can margin four 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 SMM465 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 SMM465. Any order of supply sequencing can be applied using the SMM465. Power supply ordering, trimming and Active DC control allows supply cascade sequencing, automatic level adjustment, margin testing and reset control. 2.5V 2.7V 1.8V 1.5V VDD (+2.7V to +5.5V) or 12VIN ( +8V to +15V) RST# --- t1 --- |
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