Texas Instruments TPS37B010122DSKR

Overview

TPS37B010122DSKR from Texas Instruments is a dual-channel overvoltage and undervoltage supervisor IC with independent SENSE1 (OV monitor) and SENSE2 (UV monitor) inputs, 2.7 V to 65 V supply range, 1 µA typical quiescent current, and programmable sense/reset delays via external capacitors on CTS1/CTS2 and CTR1/CTR2 pins. It operates in industrial servo drive power stages requiring fast, reliable rail monitoring.

For engineers reviewing the TPS37B010122DSKR datasheet, TPS37B010122DSKR pinout, TPS37B010122DSKR application, or TPS37B010122DSKR equivalent, key selection criteria include its 65 V-rated SENSE pins, dual independent threshold configuration (OV + UV), ±1.5% voltage threshold accuracy over –40°C to +125°C, and WSON-10 (DSK) package with non-conductive thermal pad for enhanced creepage.

Technical Context

The TPS37B010122DSKR implements two independent high-impedance comparators-one configured for overvoltage detection on SENSE1 and one for undervoltage detection on SENSE2-each with user-selectable hysteresis (2–13% or fixed 0.5–2.5 V). Its internal reference and integrated resistor dividers enable direct monitoring of 12 V/24 V rails without external components, while separate VDD and SENSE pins support voltage domain isolation.

Timing behavior is defined by internal RCTx networks: RCTS ≈ 100 kΩ sets sense delay (e.g., 1.28 ms with 10 nF), and RCTR ≈ 1000 kΩ sets reset delay (e.g., 12.8 ms with 10 nF). Manual reset is implemented via active-low CTR1/MR and CTR2/MR pins, compatible with push-button or microcontroller GPIO assertion.

Key Specifications

Pinout & Package

TPS37B010122DSKR is housed in a 10-pin WSON package (DSK), 2.5 mm × 2.5 mm, with exposed non-conductive thermal pad to meet IEC60664 creepage requirements between VDD and GND.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel voltage supervisor applications.

Compared with TPS37B010122DYY, the DSK variant offers 40% smaller footprint and improved thermal performance (RθJA = 87.4°C/W vs. 131.5°C/W); compared with TLV809E24DBVR, TPS37B010122DSKR delivers full dual-threshold supervision at industrial voltages with field-configurable timing-no single-channel or low-voltage part meets its functional scope.

Availability

TPS37B010122DSKR is available at Aetrix Electronics and suitable for industrial servo drives, PLC CPU modules, HVAC actuator controls, and functional safety subsystems requiring stable component supply across extended temperature and high-voltage operating conditions.

Supply support for TPS37B010122DSKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The TPS37 family is designed specifically for high-reliability industrial voltage supervision-emphasizing wide VIN, low IQ, dual independent thresholds, and functional safety readiness for motor control and factory automation systems.

FAQ

What is the function of the NC (PAD) pin on the TPS37B010122DSKR?

The NC (PAD) on the TPS37B010122DSKR is a non-conductive thermal pad with no internal connection. It is designed to increase creepage distance between VDD and GND per IEC60664 guidelines. The pad may be left floating or connected to PCB ground solely for mechanical stability-it must not be used as an electrical ground node or heat sink path.

Can TPS37B010122DSKR monitor both overvoltage and undervoltage on the same supply rail?

Yes, TPS37B010122DSKR can monitor a single rail for both OV and UV conditions by connecting it to both SENSE1 and SENSE2 through appropriate resistor dividers. However, each channel uses independent thresholds and hysteresis settings, allowing asymmetric window supervision-for example, OV at 28.5 V and UV at 21.5 V on a nominal 24 V rail.

What is the maximum capacitor value supported on CTS1 for sense delay programming in TPS37B010122DSKR?

The TPS37B010122DSKR supports CTS1 capacitor values up to 10 µF, yielding a maximum sense delay of 1.28 seconds. This is derived from the internal RCTS ≈ 100 kΩ network (10 µF × 100 kΩ = 1.0 s theoretical; datasheet confirms 1.28 s typical). Larger capacitors risk timing inaccuracy due to leakage and parasitic effects.

Does TPS37B010122DSKR require external pull-up resistors on its RESET outputs?

TPS37B010122DSKR RESET outputs default to open-drain topology. Therefore, external pull-up resistors are required on RESET1_OV## and RESET2_UVOD pins to establish valid logic-high levels. Push-pull variants exist in the TPS37 family but are not implemented in the B010122DSKR suffix-this part's output configuration is fixed as open-drain active-low.

How does the manual reset (MR) function interact with the automatic OV/UV detection in TPS37B010122DSKR?

In TPS37B010122DSKR, asserting CTR1/MR or CTR2/MR low forces immediate assertion of the corresponding RESET output, overriding automatic OV/UV state. The reset remains asserted until the MR pin is released (high-impedance or pulled high above VMR_IH threshold). Automatic detection resumes immediately upon MR release-no latching behavior is present in this revision.