SMM764FCR2 datasheet(31/33 Pages) SUMMIT

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SMM764

Preliminary Information

Summit Microelectronics, Inc

2098 1.1 6/29/2005

Terms and Definitions

Fault-Triggered

This term refers to either a power-off or force-shutdown operation. When a UV, OV, or

sequence termination condition trigger a power-off or force-shutdown a fault triggered power-

off or force-shutdown is said to occur. This sets the restart delay at 2.4s, and can limit the

number of allowable retries. This term has no correlation to the FAULT pin.

Command-Triggered

This term refers to either a power-off or force-shutdown operation. When either the FS# or

PWR_ON pin is asserted or an I

2C command is issued a Command-Triggered power-off or

force-shutdown is said to occur. This sets the restart delay at 12.5ms, and will not limit the

number of allowable retries.

ADOC™

ADOC (Active DC Output Control) is a proprietary secondary closed loop compensation

control, used to maintain output voltages to ±0.2%.

Power-off

Power-off sequencing refers to cascaded power-off sequencing unless explicitly noted.

Cascaded power-off sequencing refers to a feedback based supply termination in which each

channel in the previous sequence position is monitored, and the monitored voltage must fall

below a programmable OFF threshold before the next sequence position is allowed to turn

off. Channels in the same sequence position are not capable of Cascaded power-off

sequencing.

Power-on

Power-off sequencing refers to cascaded power-off sequencing unless explicitly noted.

Cascaded power-off sequencing refers to a feedback based supply termination in which each

channel in the previous sequence position is monitored, and the monitored voltage must fall

below a programmable OFF threshold before the next sequence position is allowed to turn

off. Channels in the same sequence position are not capable of Cascaded power-off

sequencing.

Force-shutdown

When all supplies are immediately disabled without regard to sequence position, or any other

quantity.

Sequence-Link™

When more than one SMM764 or SMM766 derivatives are connected creating a seamless

multi-channel network.

Programmed Under Voltage threshold for monitored channels and supplies

Programmed Over Voltage threshold for monitored channels and supplies

UVLO

Undervoltage Lockout. Prevents voltage at VDD or 12VIN pin from powering the SMM764

until proper operating voltages have been reached.

Margin

The ability to change the nominal output voltage by use of trim pin.

ADC

Analog to Digital Converter. Converts analog voltage to digital voltage. SMM764 represents

all measured voltages by 10-bit digital reading.

Retries

The number of times the SMM764 will restart after a Fault-Triggered power-off or force-

shutdown.

Restart

When the SMM764 begins power on sequencing, includes initial power-on sequence.

Power-on delay

Delay from restart timer expiration to PUPY pin active

Power-off delay

Programmable delay from VMX off to PUPY inactive

Sequence

Termination

When a supply fails to reach its programmed UV, or OFF, threshold before expiration of

internal timer.

Monitoring

When any quantity including temperature, and voltage is converted to a digital value by the

ADC and compared against a user programmable setting.

GUI

Graphical user interface. Program that reads from and writes to non-volatile registers on the

SMM764 and displays results in accordance to register function.

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