1 Features

? Functional Safety - Capable

– Documentation available to functional safety

system design

? Wide supply voltage range: 2.7 V to 65 V

? SENSE and RESET pins are 65 V graded

? Low quiescent current: 1 μA (typical)

? Flexible and wide voltage threshold options

Table 11-1

– 2.7 V to 36 V (1.5% maximum accuracy)

– 800 mV option (1% maximum accuracy)

? Built-in hysteresis (VHYS)

– Percentage options: 2% to 13% (1% steps)

– Fixed options: VTH < 8 V = 0.5 V, 1 V, 1.5 V,

2 V, 2.5 V

? Programmable reset time delay

– 10 nF = 12.8 ms, 10 μF = 12.8 s

? Programmable sense time delay

– 10 nF = 1.28 ms, 10 μF = 1.28 s

? Manual Reset (MR) feature

? Output topology: Open-Drain or Push-Pull

2 Applications

? Analog input module

? CPU (PLC controller)

? Servo drive control module

? Servo drive power stage module

? Servo drive functional safety module

? HVAC valve and actuator control

3 Description

The TPS37 is a family of wide input range and

low quiescent current window supervisors for fast

detection of overvoltage (OV) and undervoltage

(UV) conditions. Each device includes a precision

internal reference, two independent and configurable

voltage comparators and integrated resistor dividers.

The TPS37 can be connected directly to and

monitor 12 V / 24 V supply rails in a variety of

industrial applications including factory automation,

motor drives, building automation and others. Built-in

hysteresis on the SENSE pins prevents false reset

signals when monitoring a supply voltage rail.

The separate VDD and SENSE pins allow

redundancy sought by high-reliability systems.

SENSE is decoupled from VDD and can monitor

higher and lower voltages than VDD. Optional use

of external resistors are supported by the high

impedance input of the SENSE pins. CTSx and CTRx

pins allow delay adjustability on the rising and falling

edges of the RESET signals. Also, CTSx functions

as a debouncer by ignoring voltage glitches on the

monitored voltage rails; CTRx operates as a manual

reset (MR) that can be used to force a system reset.

TPS37 is available in a WSON or SOT-23 package.

The central pad is non-conductive to increase the

creepage between VDD and GND per guidelines in

IEC60664. TPS37 operates over –40°C to +125°C TA.