Texas Instruments TMP1827NNGRR

Overview

TMP1827NNGRR from Texas Instruments is a 1-Wire®-compatible digital temperature sensor IC with integrated 2-Kbit EEPROM and SHA-256-HMAC authentication engine, delivering ±0.2°C max accuracy from +10°C to +45°C, operating from 1.7V to 5.5V, and supporting overdrive mode at 90 kbps - deployed in cold-chain monitoring, medical accessories, and EV charging infrastructure for secure thermal validation.

For engineers reviewing the TMP1827NNGRR datasheet, TMP1827NNGRR pinout, TMP1827NNGRR application, or TMP1827NNGRR equivalent, this page delivers verified electrical specs, functional safety documentation support, authenticated EEPROM write protection, temperature alert I/O configuration, and bus-powered operation details critical for secure embedded thermal sensing designs.

Technical Context

The TMP1827NNGRR implements a dual-mode 1-Wire® interface (standard and overdrive) with CRC error checking and 8-kV IEC 61000-4-2 ESD protection on SDQ, enabling robust multi-drop communication on a single wire. Its internal thermal BJT sensor feeds a 16-bit ADC with 7.8125 m°C LSB resolution and ±0.2°C max accuracy across +10°C to +45°C.

Security is enforced via an on-chip SHA-256-HMAC engine compliant with FIPS 180-4 and FIPS 198-1, using factory-programmed NIST-traceable keys and supporting authenticated memory writes. The 2-Kbit EEPROM supports 64-bit block writes, 256-bit page-level write protection, and continuous read mode - all accessible through the same 1-Wire® bus.

Key Specifications

Pinout & Package

Package: WSON-8 (NGR), 2.50 mm × 2.50 mm, thermally enhanced with exposed pad.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar secure temperature sensing applications.

Compared with TMP1827NNGRR, TMP1826NNGRR removes authentication capability while retaining thermal performance, making it a lower-cost alternative for basic sensing; TMP1827NNGRT offers identical functionality in a different packaging format optimized for high-volume manufacturing - neither is pin-compatible drop-in replacement for other families.

Availability

TMP1827NNGRR is available at Aetrix Electronics and suitable for cold-chain monitoring, medical accessories, and EV charging infrastructure requiring stable component supply, long-term EEPROM data retention (25 years at 125°C), and functional safety documentation support.

Supply support for TMP1827NNGRR 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 connectivity technologies, with decades of expertise in precision sensing and industrial-grade reliability.

The TMP1827 product line delivers secure, high-accuracy temperature sensing for safety-critical and anti-counterfeiting applications - designed specifically for cold-chain logistics, medical devices, and electrified transportation systems demanding both metrological precision and cryptographic trust.

FAQ

What is the maximum temperature accuracy of the TMP1827NNGRR across its full operating range?

The TMP1827NNGRR achieves ±0.2°C maximum accuracy from +10°C to +45°C, ±0.3°C from –40°C to +105°C, and ±0.4°C from –55°C to +150°C. This graded specification reflects calibrated performance across thermal extremes - critical for validating thermal profiles in medical and automotive applications where deviation tolerance is tightly constrained. The TMP1827NNGRR does not share the ±0.9°C spec of the TMP1827N variant.

Does the TMP1827NNGRR support both bus-powered and VDD-powered operation?

Yes, the TMP1827NNGRR supports dual power modes: bus-powered (parasitic) mode using only SDQ and GND, and VDD-powered mode with dedicated supply. In bus-powered mode, the internal capacitor charges via SDQ and the external pullup resistor; VDD must be tied to GND. In VDD-powered mode, SDQ operates solely as a data line, reducing power dependency on bus timing - enabling reliable operation in noisy or high-capacitance 1-Wire® networks.

How does the SHA-256-HMAC authentication work in the TMP1827NNGRR?

The TMP1827NNGRR integrates a hardware SHA-256-HMAC engine compliant with FIPS 180-4 and FIPS 198-1. It uses factory-programmed secret keys stored in protected EEPROM to generate message authentication codes for EEPROM writes and challenge-response sequences. Host systems authenticate by verifying HMAC outputs against expected values - ensuring only authorized firmware or calibration data can be written to the 2-Kbit EEPROM, preventing cloning or tampering in supply-chain-sensitive deployments.

What are the key differences between TMP1827NNGRR and TMP1826NNGRR?

The TMP1827NNGRR includes SHA-256-HMAC authentication, authenticated EEPROM write protection, and a configurable temperature alert output (IO2/ALERT), while the TMP1826NNGRR lacks all security features and alert functionality. Both share identical temperature accuracy (±0.2°C), 2-Kbit EEPROM size, WSON-8 package, and 1-Wire® interface - but TMP1826NNGRR cannot perform cryptographic operations or enforce write protection, limiting it to non-security applications.

Can the TMP1827NNGRR operate at 90 kbps over the full –55°C to +150°C range?

Yes, the TMP1827NNGRR supports 90 kbps overdrive mode across its full –55°C to +150°C operating range when used in bus-powered mode. In VDD-powered mode, overdrive is supported across the entire range. However, in bus-powered standard-speed mode, full-range operation requires VPUR > 2.5 V above 105°C - confirmed in Figure 7-17 of the datasheet. This makes TMP1827NNGRR uniquely suited for high-speed thermal feedback in extreme-environment applications like EV power modules.