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SMR100 Dataheets PDF



Part Number SMR100
Manufacturers Summit Microelectronics
Logo Summit Microelectronics
Description Programmable Long-Delay Push-Button Reset Controller
Datasheet SMR100 DatasheetSMR100 Datasheet (PDF)

www.DataSheet4U.com 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#) .

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www.DataSheet4U.com 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 debounced 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 Manual Reset Switch RESET_IN# www.DataSheet4U.com 0.1µf VDD 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: http://www.summitmicro.com/ 2076 1.6 06/30/04 1 www.DataSheet4U www.DataSheet4U.com 4U.com www.DataSheet4U.com SMR100 Preliminary Information GENERAL DESCRIPTION The SMR100 is a programmable Reset Controller for Consumer Equipment used to monitor the power supply in µP and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used with +3.3V powered circuits. The device performs several functions: it first asserts a ‘bad power’ signal and then a reset signal whenever the VDD supply voltage declines below two preset thresholds, keeping it asserted for a programmable time period after VDD has risen above the reset threshold. The part also provides a programmable delay push button input for manual system reset. The open-drain RESET_OUT# and BAD_PWR# outputs have on-chip 100K pull-up resistors and do not require external pull-up resistors unless more drive current is needed (see figure 3). The RESET_OUT# and BAD_PWR# comparators are designed to ignore fast transients on VDD, and the outputs are guaranteed to be in the correct logic state for VDD down to 1V. Low supply current makes the SMR100 ideal for use in portable equipment. The RESET_IN# input includes a programmable hold-down delay timer for use with a push button switch for consumer equipment such as set-top boxes and PCs. A microprocessor’s (µP’s) reset input starts the µP in a known state. The SMR100 asserts a reset to prevent code -execution errors during power-up, power-down, or UnderVoltage (UV) conditions. It asserts a RESET_OUT# signal whenever the VDD supply voltage declines below a 3.0V threshold, keeping it asserted for a programmable period after VDD has risen above the reset threshold. It also asserts a Bad Power signal to warn of an impending reset or brownout condition to allow time for the system to save data before a reset occurs. The BAD_PWR# signal is also asserted whenever RESET_OUT# is asserted to prevent erroneous or false Bad Power warnings during initial turn-on. In addition to issuing a reset to the µP during powerup, power-down, and brownout conditions, the SMR100 is immune to short-duration VDD transients (glitches) due to a programmable glitch filter. Typically, a VDD transient of 100mV less than the reset threshold and lasting for a duration less than the programmed glitch filter setting will not cause a reset pulse. A 0.1µF bypass capacitor mounted as close as possible to the VDD pin provides additional transient immunity. Since the BAD_PWR# and RESET_OUT# outputs are open drain, the device interfaces easily with µPs that have bidirectional-reset pins. Connecting the RESET_OUT# output directly to the µP’s RE.


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