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.