Texas Instruments TMP105YZCR

Overview

TMP105YZCR from Texas Instruments is a digital temperature sensor IC with two-wire (I²C/SMBus) interface, 12-bit resolution (0.0625°C), ±2.0°C accuracy from –25°C to +85°C, and WCSP-6 chip-scale package. It operates from 2.6V to 3.3V, draws 50μA quiescent current, and supports thermostat control in battery-powered thermal monitoring systems.

For engineers reviewing the TMP105YZCR datasheet, TMP105YZCR pinout, TMP105YZCR application, or TMP105YZCR equivalent, key selection criteria include its SMBus Alert function, user-selectable 9–12-bit resolution, dual-mode (Comparator/Interrupt) ALERT output, low-power shutdown (1.5μA), and operation across –40°C to +125°C.

Technical Context

The TMP105YZCR integrates a precision bandgap temperature sensor, 12-bit sigma-delta ADC, oscillator, configuration logic, and I²C-compatible serial interface in a single die. Its on-chip thermal sensing element measures die temperature directly, with thermal paths routed through metal bumps for minimal thermal resistance.

It implements a programmable fault queue (1/2/4/6 consecutive faults), configurable thermostat thresholds (THIGH/TLOW), polarity-selectable open-drain ALERT output, and One-Shot conversion mode triggered via Configuration Register. All register access uses an 8-bit pointer addressing scheme with MSB-first byte ordering.

Key Specifications

Pinout & Package

Package: WCSP-6 (YZC), 2 × 3 bump array, 0.5 mm pitch, 1.50 mm × 1.15 mm footprint, bump-side-down mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital temperature sensor applications.

Compared with TMP105YZCR, TMP112DCKR offers tighter accuracy and EEPROM-based calibration but removes ALERT polarity flexibility, while LM75BIMM/NOPB trades miniaturization and advanced alert logic for wider voltage range and through-hole assembly compatibility.

Availability

TMP105YZCR is available at Aetrix Electronics and suitable for battery management, notebook thermal protection, and environmental monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TMP105YZCR 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 U.S.-based semiconductor company specializing in analog, embedded processing, and connectivity technologies, with leadership in precision sensing and low-power design.

The TMP105YZCR belongs to TI's precision analog temperature sensor product line, engineered for high-accuracy, low-quiescent-current thermal monitoring in portable and space-constrained electronics.

FAQ

What is the operating voltage range for the TMP105YZCR?

The TMP105YZCR operates from 2.6V to 3.3V. It is not rated for 5V operation, and exceeding 3.3V may cause permanent damage. The device supports direct connection to 2.8V or 3.3V system rails without level shifting, and its I²C pins tolerate up to 6.0V logic levels - making it compatible with mixed-voltage buses when used with appropriate pull-ups.

How does the ALERT pin function in Comparator Mode versus Interrupt Mode on the TMP105YZCR?

In Comparator Mode (TM = 0), the TMP105YZCR's ALERT pin remains asserted until temperature falls below TLOW for the programmed number of consecutive faults. In Interrupt Mode (TM = 1), ALERT clears automatically upon any register read or SMBus Alert Response, enabling event-driven firmware handling. Both modes support polarity inversion via the POL bit, and fault persistence is controlled by F1/F0 bits.

Can the TMP105YZCR be used without external components?

Yes - the TMP105YZCR requires no external passive components for basic operation. Pull-up resistors on SDA, SCL, and ALERT are mandatory for I²C/SMBus compliance, and a 0.1μF ceramic bypass capacitor on V+ is strongly recommended to suppress supply noise. No external crystal, RC network, or calibration circuitry is needed, as all timing and conversion functions are fully integrated.

What is the thermal measurement principle of the TMP105YZCR?

The TMP105YZCR measures its own die temperature using an on-chip bandgap-based diode sensor. Thermal conduction occurs primarily through the metal bumps of the WCSP-6 package into the PCB. For accurate ambient or surface temperature readings, the device must be thermally isolated from conductive heat paths (e.g., copper pours) and airflow disturbances - otherwise, readings reflect package self-heating or board conduction rather than target environment temperature.

How do I configure the TMP105YZCR for 12-bit resolution and One-Shot conversion?

To set 12-bit resolution, write 0x80 (R1=1, R0=1) to bits D1–D0 of the Configuration Register (pointer 0x01). To trigger One-Shot, first place the device in Shutdown Mode (SD=1), then write 0x81 to the Configuration Register - the OS bit (D7) initiates conversion and auto-clears. The TMP105YZCR will complete one measurement and return to shutdown, drawing only 1.5μA between samples.