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EM6151V53SO8B Datasheet(PDF) 1 Page - EM Microelectronic - MARIN SA |
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EM6151V53SO8B Datasheet(HTML) 1 Page - EM Microelectronic - MARIN SA |
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1 / 10 page  R EM6151 Copyright © 2005, EM Microelectronic-Marin SA 1 www.emmicroelectronic.com rev. B / 06.06 Low Power Windowed Watchdog with Reset, Sleep Mode Functions Description The EM6151 offers a high level of integration by combining voltage monitoring and software monitoring using a windowed watchdog. A comparator monitors the voltage applied at the VIN input comparing it with an internal voltage reference VREF. The power-on reset function is initialized after VIN reaches VREF and takes the reset output inactive after a delay TPOR depending on external resistance ROSC. The reset output goes active low when the VIN voltage is less than VREF. The RES and EN outputs are guaranteed to be in a correct state for a supply voltage as low as 1.2 V. The watchdog function monitors software cycle time and execution. If software clears the watchdog too quickly (incorrect cycle time) or too slowly (incorrect execution) it will cause the system to be reset. For enhanced security, the watchdog must be serviced within an “open” time window. During the remaining time, the watchdog time window is “closed” and a reset will occur should a TCL pulse be received by the watchdog during this “closed” time window. The ratio of the open/closed window is either 33%/67% or 67%/33%. The system ENABLE output prevents critical control functions being activated until software has successfully cleared the watchdog three times. Such a security could be used to prevent motor controls being energized on repeated resets of a faulty system. When the microcontroller goes in stand-by mode or stops working, no signal is received on the TCL input of the EM6151 (version 55) and it goes into a stand-by mode in order to save power (CAN-bus sleep detector). Features Low quiescent current 35 μA -40°C to +125°C temperature range Windowed watchdog with an adjustable time windows, guaranteeing a minimum time and a maximum time between software clearing of the watchdog Time base accuracy ±8% (at 100ms) Voltage reference accuracy ±3% Sleep mode function (V55) Adjustable threshold voltage using external resistors Adjustable power on reset (POR) delay using one external resistor Open-drain active-low RESET output Reset output guaranteed for regulated output voltage down to 1.2 V System ENABLE output offers added security Qualified according to AEC-Q100 Green SO-8 package (RoHS compliant) Applications Automotive systems Industrial Home security systems Telecom / Networking Computers Set top boxes Typical Operating Configuration Fig. 1 Selection Table Part Number VREF Closed Window Open Window CAN-bus sleep detector EM6151V30 1.17 V 67% 33% No EM6151V50 1.52 V 67% 33% No EM6151V53 1.52 V 33% 67% No EM6151V55 1.275 V 67% 33% Yes Please refer to Fig. 4 for more information about the open/closed window of the watchdog. EM MICROELECTRONIC - MARIN SA VSS GND EM6151 RES EN TCL VIN VDD VDD I/O RES I/O ROSC R1 R2 100nF ROSC |
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