STMicroelectronics TSC1641IQT

Overview

TSC1641IQT from STMicroelectronics is a 16-bit dual-channel sigma-delta analog front-end (AFE) for high-precision current, voltage, power, and temperature monitoring. It supports bidirectional/high-side/low-side shunt sensing up to ±81.92 mV, load voltage sensing from 0 V to 60 V, and features ultra-low input bias current (20 pA typ. at VCM = 12 V), 0.5% max gain error, and MIPI I3C interface up to 12.5 MHz - deployed in industrial battery packs and telecom power supplies.

For engineers reviewing the TSC1641IQT datasheet, TSC1641IQT pinout, TSC1641IQT application, or TSC1641IQT equivalent, this device delivers synchronized dual-channel conversion with programmable timing (128 µs–32.7 ms), integrated die temperature monitoring, SMBus alert compatibility, and flexible I²C/I3C address configuration via A0/A1 pins - critical for DC power integrity validation in embedded power systems.

Technical Context

The TSC1641IQT implements two independent 16-bit sigma-delta ADC channels: one for shunt voltage (±81.92 mV full-scale, 2.5 µV/LSB) and one for load voltage (0–60 V, 2 mV/LSB), both sampled simultaneously with matched conversion timing. Its digital filter self-adapts to selected conversion rates, delivering noise-free resolution from 12.2 bits (128 µs) to 16 bits (32.768 ms).

It operates as an I²C/SMbus target (1 MHz max) or MIPI I3C SDR-only target (12.5 MHz), with automatic open-drain/push-pull switching on SDA. Addressing uses static 7-bit addresses (0x40–0x43) set by A0/A1 pins, and supports hot-join, in-band interrupts (IBI), and CCC commands including ENEC, RSTDAA, and GETPID - enabling plug-and-play integration with STM32 and other modern controllers.

Key Specifications

Pinout & Package

Supplied in a thermally enhanced DFN10 (3 × 3 mm²) package with exposed pad (non-electrical, must be left floating). Package supports 76 °C/W junction-to-ambient thermal resistance on JEDEC 2S2P board.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision power monitoring applications.

Compared with INA229AQDGSRQ1 and MAX40080FAUA+, the TSC1641IQT uniquely combines 60 V direct load sensing, integrated temperature monitoring, MIPI I3C support, and programmable alert thresholds - making it optimal for next-generation telecom and industrial power systems demanding protocol agility and full-parameter telemetry.

Availability

TSC1641IQT is available at Aetrix Electronics and suitable for industrial battery packs, power inverters, and telecom equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for safety-critical deployments.

Supply support for TSC1641IQT 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The TSC1641 belongs to ST's high-precision analog front-end product line, engineered specifically for real-time DC power monitoring in energy-efficient infrastructure - emphasizing accuracy, multi-protocol interoperability, and thermal robustness across harsh operating environments.

FAQ

What is the maximum supported load voltage for the TSC1641IQT, and how is overvoltage protection implemented?

The TSC1641IQT supports a load voltage input range of 0 V to 60 V, with absolute maximum rating of 65 V on VLOAD. Overvoltage protection is implemented via programmable alert thresholds: users configure upper/lower limits in the ALERT_THR register, and the device asserts the open-drain ALERT pin when measured VLOAD exceeds those bounds - no internal clamping or shutdown occurs, preserving measurement continuity during transient events.

Can the TSC1641IQT perform true simultaneous sampling of shunt and load voltage, and what is the timing relationship between channels?

Yes - the TSC1641IQT uses a single sigma-delta modulator core with time-multiplexed inputs and dual digital filters, achieving synchronized sampling with <10 ns skew between shunt and load voltage conversions. Both channels share identical conversion timing (e.g., 128 µs or 32.768 ms), ensuring coherent power calculations without interpolation or timestamp alignment.

How does the TSC1641IQT handle I²C and MIPI I3C coexistence on the same SDA/SCL lines?

The TSC1641IQT boots into I²C mode and remains compatible until a controller issues an I3C dynamic address assignment (DAA) using I²C fast-mode-plus timing. Upon successful DAA, the device disables I²C signaling and switches SDA to push-pull mode automatically - enabling mixed-bus operation where legacy I²C devices and I3C targets coexist without protocol conflict.

What is the impact of negative slew rate on VLOAD, and how does it affect current measurement accuracy?

When VLOAD drops faster than 80 V/s, the TSC1641IQT's internal sampling capacitor cannot fully settle, causing transient degradation in shunt voltage measurement accuracy - exceeding ±3% error until slew rate falls within specification. This behavior is documented in Section 5.1.3 of DS14338 and is mitigated by selecting appropriate conversion time (e.g., ≥2.048 ms) for high-dV/dt applications.