Nanopower high-input voltage supervisors allows monitoring 9V rails or batteries without external components

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-I_q 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 (V_POR) 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 V_DD drops below the negative voltage threshold (V_IT-) or when manual reset (MR) is drawn to a low logic (V_{MR_L}). Reset signal is cleared when V_DD rise above VIT- plus hysteresis (V_IT+) and manual reset is floating or above V_{MR_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 V_DD, built-in hysteresis and low open-drain output leakage current (I_LKG(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.