this application, X80141 provides comparators, internal references del

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this application, X80141 provides comparators, internal references del

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Carlos Martinez 2/04
this application, X80141 provides comparators, internal references delay circuits simply control sequencing multiple converters. this design, dual digitally controlled potentiometer (DCP) provides adjustment thresholds voltage supplies. This allows power supplies trimmed, either down, while maintaining desirable under-
AN175
Cost In-circuit Programmable Quad Power Sequencer
voltage margin. block diagram appears Figure X80141 provides undervoltage thresholds each monitored inputs, while X93256 provides threshold adjustment. X80141 internal thresholds adjustable ranges shown Table larger smaller power distribution schemes, Xicor offers dual, triple quad sequencers/supervisors.
Figure Dual Sequencer with Adjustable Thresholds (Block Diagram)
VOUT ON/OFF VOUT
5VOUT
3.3VOUT
3.9K
ON/OFF VOUT
1.8VOUT
ON/OFF VOUT
1.2VOUT
4.87K
ON/OFF
Xicor X93256
V1MON V2MON V3MON V4MON V1GDO
V2GDO V3GDO
6.04K
Xicor X80141
4.3K
-1.8V threshold adjustable from 1.45 1.92V 14mV steps. -1.2V Threshold adjustable from 1.30V 13mV steps.
RESET
RESET goes active 100ms after supplies good
RESET Master RESET
2-wire serial communication delays, monitor status, access EEPROM
*X93256 upcoming Xicor product. X9409 alternative.
1.0.0 2/27/04
www.xicor.com
Table X80141 Input Thresholds
Monitored Voltage 3.3V 1.8V 1.2V X80141 threshold 4.50 2.25 0.90 0.90 Threshold after external control 4.50 3.13V 1.45-1.92V 0.90 1.30V Input VMON1 VMON2 VMON3 VMON4
AN175
100ms, 500ms, 2-wire interface provides access registers allow value change. Once programmed, delay remains nonvolatile memory. Once supplies reach their desired threshold, after selectable delay, RESET signal goes active start operation system. master reset input turns supplies, connected system logic, main controller, manual input. This circuit physically very small. handful descrete elements take less board area than 44-lead TQFP device. scale size drawing shown Figure addition other features, X80141 contains status register that shows state inputs bits general purpose EEPROM board failure tracking, test parameters.
This application shows sequencing monitoring supplies configured "daisy chain" relay configuration. When supply reaches threshold, X80141 delays period time, then starts next supply with V1GDO output. When this second supply reaches desired threshold, will signal next supply start, This shown Figure each input there selectable delay time. choice Figure Sequencer Timing
Power Supply turns V1MON (5V)
tDELAY1
V1MON threshold
Programmable Delay
100ms 500ms 1sec 5sec Power Supply turns V2MON 100ms threshold 500ms 1sec 5sec Programmable
Delay
Select tDELAYx tRESET 2-wire interface.
V1GDO Power Supply OUTPUT (3.3V)
tDELAY2
V2GDO Power Supply OUTPUT (1.8V)
Power Supply turns 100ms 500ms 1sec Programmable 5sec
Delay
V3MON threshold
tDELAY3
V3GDO Power Supply OUTPUT (1.2V)
tDELAY4
Power Supply turns V4MON threshold
Programmable Delay
100ms 500ms 1sec 5sec 100ms 500ms 1sec 5sec
V4GDO
tRESET
Programmable Delay
RESET
1.0.0 2/27/04
www.xicor.com
Figure Board Space Requirements Application
AN175
X80140
44-lead TQFP
X93256
Scale (mm)
1.0.0 2/27/04
www.xicor.com

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