Texas Instruments TPS3840 Nanopower High-Input Voltage Supervisors arrive with a broad Vin which enables monitoring 9V rails or batteries with no external components and 24V rails with external resistors. Nano-Iq increases battery life for low power applications and reduces current consumption when utilising external resistors. Fast start-up delay enables the detection of a voltage fault before the rest of the system powers up giving maximum safety in hazardous start-up fault conditions. Low Power-on-Reset (VPOR) stops false resets, premature enable or turn-on of next device, and proper transistor control through power-up and power-down.
Reset output signal is affirmed when the voltage at VDD drops below the negative voltage threshold (VIT-) or when manual reset (MR) is drawn to a low logic (VMR_L). Reset signal is cleared when VDD rise above VIT- plus hysteresis (VIT+) and manual reset is floating or above VMR_H and the reset time delay (tD) expires. Reset time delay can be programmed by attaching a capacitor between CT pin and ground. For a fast reset, CT pin can be left floating. Further features incorporate built-in glitch immunity protection for MR and VDD, built-in hysteresis and low open-drain output leakage current (ILKG(OD)).
Typical applications include grid infrastructure: circuit breaker, smart meter, other monitoring, and protection equipment; factory automation: field transmitter, PLC; building automation: fire safety, smoke detector, and HVAC; electronic point of sale; portable and battery-powered systems.