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AS1918 Datasheet(PDF) 1 Page - ams AG |
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AS1918 Datasheet(HTML) 1 Page - ams AG |
1 / 13 page AS1916 - AS1918 Microprocessor Supervisory Circuits with Manual Reset and Watchdog austriamicrosystems Data Sheet www.austriamicrosystems.com Revision 0.52 1 - 13 1 General Description The AS1916 - AS1918 microprocessor supervisory cir- cuits were designed to generate a reset when the moni- tored supply voltage falls below a factory-trimmed threshold. The reset remains asserted for a minimum timeout period after the supply voltage stabilizes. Guaranteed to be in the correct state for VCC higher than +1.0V, these devices are ideal for portable and battery- powered systems with strict monitoring requirements. The devices feature factory-trimmed thresholds to moni- tor a supply voltage between 1.8 and 3.6V. The devices are available with the reset output types listed in Table 1. The AS1916 - AS1918 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 AS1916 - AS1918 are available in a 5-pin SOT23 package. Figure 1. Typical Application Diagram 2 Key Features ! VCC Supervisory Range: +1.8 to +3.6V ! Guaranteed Reset Valid Down to VCC = +1.0V ! Reset Timeout Delay: 215ms ! Manual Reset Input ! Three Reset Output Types - Active-Low Push/Pull (AS1916) - Active-High Push/Pull (AS1917) - Active-Low Open-Drain (AS1918) ! Watchdog Timeout Period: 1.5s ! Immune to Fast Negative VCC Transients ! External Components Not Required ! 5-pin SOT23 Package 3 Applications The devices are ideal for portable and battery-powered systems, embedded controllers, intelligent instruments, automotive systems, and critical CPU monitoring appli- cations. Table 1. Standard Products Model Reset Output Type AS1916 Active-Low Push/Pull AS1917 Active-High Push/Pull AS1918 Active-Low Open-Drain AS1916/ AS1918 External Reset CPU I/O Supply VCC GND RESETN I/O 4 WDI 5 VCC 3 MRN GND 2 1 RESETN |
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