SMR100
THIS PRODUCT HAS REACHED END OF LIFE
Programmable Long-Delay Push-Button Reset Controller for Consumer Equipment
FEATURES & APPLICATIONS
•
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
TM
•
6 ball
Ultra
CSP (Chip-Scale) Package
Applications
•
Satellite and Cable-TV Set-top box
•
Handheld PCs, Cameras, Camcorders, PDAs
•
Security/Medical Alert Systems
INTRODUCTION
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.
SIMPLIFIED APPLICATIONS DRAWING
3.3V
0.1µf
VDD
Manual
Reset
Switch
RESET_IN#
3.3V
TRIM_C
AP
FILT_CAP
BAD_PWR#
SMR100
RESET_OUT#
PROG
GND
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 408 436-9890 • FAX 408 436-9897
The Summit Web Site can be accessed by “right” or “left” mouse clicking on the link:
2076 1.6 06/30/04
1
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
