SMR100 Datasheet, PDF (1/9 Pages) Summit Microelectronics, Inc. – Programmable Long-Delay Push-Button Reset Controller for Consumer Equipment

SMR100
THIS PRODUCT HAS REACHED END OF LIFE
Programmable Long-Delay Push-Button Reset Controller for Consumer Equipment
FEATURES & APPLICATIONS
INTRODUCTION
• De-Bounced Reset Input with up to 40 Second
Programmable Delay Time
• External Push-Button Control Provides a
Reliable End-User System Reset Function
• Reset Signal at 3.0V with a Programmable
Timeout Period
• Brownout Warning Signal whenever the supply
dips below 3.1V
• Programmable Glitch Filtering of Brownout
Warning (BAD_PWR#) and Reset Function
• 8 Pin SOIC Package
• 6 ball Ultra CSP^TM (Chip-Scale) Package
Applications
• Satellite and Cable-TV Set-top box
• Handheld PCs, Cameras, Camcorders, PDAs
• Security/Medical Alert Systems
SIMPLIFIED APPLICATIONS DRAWING
The SMR100 programmable reset controller is
designed for consumer applications specified by
Satellite-TV set-top box standards. The SMR100
provides a satellite box controller solution during initial
setup, changing programming cards and/or system
reset needs without removing power. The part can
accommodate a long-delay hold down of an external
reset push-button using an internal programmable de-
bounced timer. The part is factory programmed,
however, multiplexed programming pins are also
provided for in-system programming for prototype
purposes.
The required hold down time is programmable from
0.325 to 40 Sec with an internal on-chip oscillator.
Accurate warning of a 3.1V brownout condition
(BAD_PWR#), and a programmable reset
(RESET_OUT#) timeout period when the VDD supply
pin reaches 3.0V are also provided. During a reset
(RESET_OUT#), the part enables the “BAD_PWR#” or
brownout warning output until the reset has cleared. A
programmable glitch filter avoids nuisance tripping of
the internal comparators.
3.3V
Manual
Reset
Switch
0.1µf
RESET_IN#
TRIM_C
AP
FILT_CAP
BAD_PWR#
3.3V
SMR100
RESET_OUT#
ASIC
µP
Figure 1 – Applications Schematic using the SMR100 to supervise the supply to digital components. As
shown, the SMR100 is designed to use a minimum of external components.
© SUMMIT Microelectronics, Inc. 2004 • 1717 Fox Drive • San Jose CA 95131 • Phone [phone] • FAX [phone]
The Summit Web Site can be accessed by “right” or “left” mouse clicking on the link: http://www.summitmicro.com/
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