Texas Instruments TPS3110E12DBVR

Overview

TPS3110E12DBVR from Texas Instruments is a precision ultralow-current voltage supervisor with integrated watchdog timer, designed for microprocessor reset and system-level supervision in battery-powered DSP/microcontroller systems. It features a fixed 1.2V VDD threshold (±0.75% accuracy), 1.2μA typical supply current, push-pull active-low RESET output, and watchdog timeout of 1.1s (typical) triggered by WDI edge transitions.

For engineers reviewing the TPS3110E12DBVR datasheet, TPS3110E12DBVR pinout, TPS3110E12DBVR application, or TPS3110E12DBVR equivalent, key selection criteria include its 1.2V trip point, –40°C to 125°C operating range, SOT-23-6 package, watchdog timer integration, and ability to assert RESET down to VDD = 0.4V - critical for low-voltage brownout detection in portable and industrial embedded designs.

Technical Context

The TPS3110E12DBVR implements a dual-monitoring architecture: one comparator supervises VDD against a factory-trimmed 1.2V threshold (VIT– = 1.142V typ at 25°C), while a second comparator monitors the SENSE input against a fixed 0.551V reference. Its internal watchdog logic resets the system if WDI fails to toggle within 1.1s (typ), and a 130ms (typ) power-on reset delay ensures stable initialization after VDD exceeds VIT– + VHYS.

RESET assertion is OR-combined from VDD undervoltage, SENSE undervoltage, MR activation, or watchdog timeout. The push-pull output drives high without external pull-up, supporting direct interface to µC reset inputs, and operates reliably across 0.9V–3.6V VDD with full functionality down to 0.8V for SENSE/WDI monitoring.

Key Specifications

Pinout & Package

TPS3110E12DBVR is housed in a 6-pin SOT-23 (DBV) package, 2.90mm × 2.80mm footprint, optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.

Compared with TPS3110E12DBVR, TPS3110E15DBVR offers identical supervision architecture but targets 1.5V rails, while TPS3823-12DBVR sacrifices watchdog capability and push-pull drive for lower cost and simpler use cases - making TPS3110E12DBVR the optimal choice for safety-critical, battery-sensitive, or software-reliability–dependent designs.

Availability

TPS3110E12DBVR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and wireless edge node gateways requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3110E12DBVR 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 specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability supervisory circuits.

The TPS31xx family was engineered specifically for ultra-low-power, high-accuracy reset and watchdog supervision in battery-operated and thermally demanding embedded systems - emphasizing precision thresholding, sub-µA operation, and extended temperature resilience.

FAQ

What is the exact VDD threshold voltage of the TPS3110E12DBVR?

The TPS3110E12DBVR has a factory-trimmed negative-going input threshold voltage (VIT–) of 1.142V (typical) at 25°C, with guaranteed limits of 1.133V (min) and 1.151V (max). Over the full –40°C to 125°C range, VIT– remains within 1.084V to 1.199V, ensuring consistent 1.2V rail supervision across environmental extremes. This value is specific to the E12 variant and confirmed in Section 6.5 of the SLVS363H datasheet.

Does the TPS3110E12DBVR require an external pull-up resistor on the RESET pin?

No, the TPS3110E12DBVR features an active-low push-pull RESET output, eliminating the need for an external pull-up resistor. The output actively drives high (VOH ≥ 0.8×VDD) and low (VOL ≤ 0.3V at 3mA) without external components. This simplifies PCB layout, reduces BOM count, and improves noise immunity compared to open-drain alternatives - a key differentiator confirmed in the Pin Configuration section and Electrical Characteristics table of the TPS3110E12DBVR datasheet.

How does the watchdog timer in the TPS3110E12DBVR function?

The TPS3110E12DBVR watchdog timer triggers RESET if the WDI pin remains static (high or low) longer than 1.1s (typical). A rising or falling edge on WDI resets the timeout counter. This behavior is independent of VDD and SENSE status and provides runtime software crash detection. The timer is reinitialized upon any RESET assertion, ensuring immediate recovery - details are specified in Sections 7.3.1 and 6.6 of the official datasheet.

Can the TPS3110E12DBVR monitor a 3.3V supply rail?

Yes, the TPS3110E12DBVR can monitor a 3.3V rail using its SENSE input. Since SENSE compares against a fixed 0.551V internal reference, a resistor divider (e.g., R1 = 5.1MΩ, R2 = 1MΩ) scales the 3.3V rail to ~0.54V at SENSE. When the rail drops below 3.3V × (0.551/0.54) ≈ 3.36V, RESET asserts. This method is validated in Figure 7-5 and Section 7.3.4 of the TPS3110E12DBVR datasheet and supports accurate supervision of any rail >0.551V.

What is the minimum VDD voltage at which the TPS3110E12DBVR can assert RESET?

The TPS3110E12DBVR can assert RESET with VDD as low as 0.4V, per the "RESET Defined With Input Voltages as Low As 0.4V" feature statement and Figure 6-4 timing diagram. Below 0.4V, internal circuitry may not operate reliably, but the device guarantees valid RESET assertion down to this level - enabling robust brownout detection in deeply discharged battery scenarios. This capability is unique to the TPS311x family and explicitly documented in the Features and Timing Requirements sections.