Summit Intros SMR 101 Programmable RESET Controller
Summit Microelectronics Inc. (San Jose, CA), a supplier of programmable, mixed-signal, power management platform solutions, introduced its new SMR 101 programmable RESET controller, which uses Summit's GUI-based programming technology. The SMR101 can be customized to address hundreds of combinations of voltage and timing requirements – an improvement over conventional "fixed" RESET ICs. The SMR101 is suitable for a wide variety of applications in consumer and customer-premises equipment, including set-top boxes, GPS devices, home DSL routers, cable modems, video equipment, POS terminals, digital cameras, and other hand-held computing devices.
The SMR101 offers dual RESET outputs that respond to either an external manual push-button input or an internal voltage monitor. The "soft" RESET output will assert when the monitored voltage falls below the user-programmed threshold of 2.30 V to 4.50 V or when the external input is asserted and held for a user-programmed hold-time of 0.125 s to 10 s. The "hard" RESET output will assert when the external input is asserted and held for a user-programmed hold-time of 0.5 s to 40 s. Both RESET outputs are held valid for a "timeout" duration that is user-programmable from 1 ms to 200 ms.
The SMR101's dual RESET output capability allows the system designer to implement a two-level RESET function, thereby providing an initial "soft" RESET before completely shutting down the system with the "hard" RESET. In a typical application, the "soft" RESET would apply to volatile registers in an embedded controller while the hard RESET would result to a full-power cycle without the associated power-up delays. Alternatively the dual RESET outputs can be linked to the system power-up sequence and allow multiple system startup modes such as "normal" and "diagnostic".
The functionality of the SMR101, combined with the long duration (up to 40 s) of the input hold-down time, prevents accidental RESET operation and eliminates the need for many consumer electronics to hide the push-button. To ensure robust system operation the manual RESET input is "de-bounced" to suppress noise from manual pushbutton switches. Furthermore, an integrated time domain glitch filter provides power supply transient immunity, thereby avoiding false RESET assertions.
The SMR101 operates from +2.7 V to +5.5 V and consumes only 40 mA. It is offered in a six-bump, 1.2 mm x 1.8 mm, ultra CSP package. An eight-lead SOIC package is also available. Both packages are available as lead-free and RoHS-standard compliant. The operating temperature range for the SMR101 is –5 °C to +70 °C. Available now in production quantities, the SMR101 is priced at $0.56 each in quantities of 10,000 units for the CSP package and at $0.76 each in quantities of 10,000 units for the SOIC package.
