TCAL9539RTWRQ1

Overview

The TCAL9539RTWRQ1 is an automotive-grade, low-voltage 16-bit I2C and SMBus I/O expander with interrupt output, reset, and configuration registers. It operates within a supply voltage range of 1.08 V to 3.6 V and supports clock frequencies up to 1 MHz (Fast-mode Plus). The device features Agile I/O ports with programmable drive strength, configurable pull-up/pull-down resistors, and latchable inputs. It includes an active-low hardware reset input and an open-drain active-low interrupt output. Packaged in a WQFN-24 (4 mm × 4 mm) format, it is qualified under AEC-Q100 for temperature grade 1 (-40°C to +125°C).

Feature Summary

• Agile I/O functionality with programmable output drive strength and configurable internal pull-up/pull-down resistors.
• Hardware address pins allow two devices to share the same I2C or SMBus bus.
• Active-low reset input and internal power-on reset ensure reliable initialization.
• Open-drain active-low interrupt output indicates input state changes without continuous bus polling.

Applications

• Automotive infotainment and cluster systems
• Body electronics and lighting control
• Hybrid, electric, and powertrain systems
• Industrial transportation applications

Procurement Notes

Verify the component matches the exact part number TCAL9539RTWRQ1, ensuring the 'Q1' suffix confirms automotive qualification. Confirm the package type is WQFN-24 and check for authenticity through authorized Texas Instruments distributors. Ensure storage conditions comply with moisture sensitivity levels specified in the datasheet prior to soldering.

Selection Notes

Select this component when expanding GPIOs for processors with limited pins in automotive environments. It is suitable for interfacing switches, sensors, LEDs, and fans. Consider the 1.08 V to 3.6 V operating range and 1 MHz speed for system compatibility. Verify that the WQFN-24 package fits the PCB layout constraints and thermal requirements.

Part Context

This device belongs to the TCAL9539-Q1 family of low-voltage I/O expanders designed for automotive applications. It provides parallel I/O expansion over the I2C/SMBus protocol. The 'RTWR' suffix denotes the specific WQFN-24 tape-and-reel packaging variant manufactured by Texas Instruments.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material. Consult the Texas Instruments orderable addendum for direct replacements or cross-reference options.