austriamicrosystems AG is now ams AG The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30 8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 e-Mail: ams sales ams.com Please visit our website at www.ams.com Datasheet AS1910 - AS1915 Dual-Voltage Microprocessor Supervisory Circuits with Manual Reset and Watchdog 1 General Description 2 Key Features Primary VCC Supervisory Range: +1.8 to +3.6V The AS1910 - AS1915 microprocessor supervisory circuits were designed to generate a reset when one of the two monitored supply Secondary VCC Supervisory Range: +0.9 to +2.5V (AS1913/ voltages falls below a factory-trimmed threshold, and to maintain the AS1914/AS1915) reset for a minimum timeout period when both supplies are above User-Adjustable Threshold Down to +0.63V (AS1910/AS1911/ their reset thresholds. Guaranteed to be in the correct state for VCC AS1912) higher than +1.0V, these devices are ideal for multiple-voltage systems with strict monitoring requirements. Guaranteed Reset Valid Down to VCC = +1.0V The AS1913/AS1914/AS1915 feature factory-trimmed thresholds to Reset Timeout Delay: 215ms monitor a primary voltage between 1.8 and 3.6V, and a secondary Manual Reset Input voltage between 0.9 and 2.5V. Three Reset Output Types: For the AS1910/AS1911/AS1912, a secondary monitoring voltage can be user-adjusted via an external resistor divider down to 0.6V. - Active-High Push/Pull - Active-Low Push/Pull The devices are available with the reset output types listed in Table - Active-Low Open-Drain 1. Watchdog Timeout Period: 1.5s Table 1. Standard Products Immune to Fast Negative VCC Transients Model Reset Output Type External Components Not Required AS1910/AS1913 Active-Low Push/Pull Operating Temperature Range: -40 to +125C AS1911/AS1914 Active-High Push/Pull 6-pin SOT23 Package AS1912/AS1915 Active-Low Open-Drain The AS1910 - AS1915 include a manual-reset input for systems that never fully power down the microprocessor. Additionally, these 3 Applications devices feature a watchdog timer to help ensure that the processor is The devices are ideal for portable and battery-powered systems, operating within proper code boundaries. embedded controllers, intelligent instruments, automotive systems, The AS1910 - AS1915 are available in a 6-pin SOT23 package. critical CPU monitoring, and any multi-supply application. Figure 1. Typical Application Diagram I/O Supply 6 VCC VCC Core Supply 5 AS1913/ 1 CPU VCC2 VCC2 AS1915 RESETN RESETN 3 4 GND External I/O MRN WDI Reset GND 2 www.austriamicrosystems.com/Supervisors/AS1910 Revision 1.03 1 - 16 ams AG Technical content still valid