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AS1915VD-T Datasheet(PDF) 1 Page - ams AG |
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AS1915VD-T Datasheet(HTML) 1 Page - ams AG |
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1 / 15 page  AS1910 - AS1915 Dual-Volta ge Microprocessor Supervisory Circuits with Manual Reset and Watchdog Dat a Sh eet www.austriamicrosystems.com Revision 1.00 1 - 15 1 General Description The AS1910 - AS1915 microprocessor supervisory cir- cuits were designed to generate a reset when one of the two monitored supply voltages falls below a factory- trimmed threshold, and to maintain the reset for a mini- mum timeout period when both supplies are above their reset thresholds. Guaranteed to be in the correct state for VCC higher than +1.0V, these devices are ideal for multiple-voltage systems with strict monitoring require- ments. The AS1913/AS1914/AS1915 feature factory-trimmed thresholds to monitor a primary voltage between 1.8 and 3.6V, and a secondary voltage between 0.9 and 2.5V. For the AS1910/AS1911/AS1912, a secondary monitor- ing voltage can be user-adjusted via an external resistor divider down to 0.6V. The devices are available with the reset output types listed in Table 1. The AS1910 - AS1915 include a manual-reset input for systems that never fully power down the microproces- sor. Additionally, these devices feature a watchdog timer to help ensure that the processor is operating within proper code boundaries. The AS1910 - AS1915 are available in a 6-pin SOT23 package. Figure 1. Typical Application Diagram 2 Key Features ! Primary VCC Supervisory Range: +1.8 to +3.6V ! Secondary VCC Supervisory Range: +0.9 to +2.5V (AS1913/AS1914/AS1915) ! User-Adjustable Threshold Down to +0.63V (AS1910/AS1911/AS1912) ! Guaranteed Reset Valid Down to VCC = +1.0V ! Reset Timeout Delay: 215ms ! Manual Reset Input ! Three Reset Output Types - Active-High Push/Pull - Active-Low Push/Pull - Active-Low Open-Drain ! Watchdog Timeout Period: 1.5s ! Immune to Fast Negative VCC Transients ! External Components Not Required ! Operating Temperature Range: -40 to +125°C ! 6-pin SOT23 Package 3 Applications The devices are ideal for portable and battery-powered systems, embedded controllers, intelligent instruments, automotive systems, critical CPU monitoring, and any multi-supply application. Table 1. Standard Products Model Reset Output Type AS1910/AS1913 Active-Low Push/Pull AS1911/AS1914 Active-High Push/Pull AS1912/AS1915 Active-Low Open-Drain External Reset CPU Core Supply I/O Supply VCC VCC2 GND RESETN I/O 4 WDI 6 VCC 3 MRN GND 2 1 RESETN 5 VCC2 AS1913/ AS1915 |
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