TCA9537DGSR

Overview

The TCA9537DGSR is a remote 4-bit I2C and SMBus I/O expander manufactured by Texas Instruments. It operates within a supply voltage range of 1.65 V to 5.5 V and supports Fast mode plus clock frequencies up to 1 MHz. The device features five-volt tolerant I/O ports, an open-drain interrupt output (INT), and a dedicated RESET input pin. It includes configuration registers for input/output selection, polarity inversion, and software reset capabilities via the I2C General Call command. The component is housed in a 10-pin VSSOP package with dimensions of 3.00 mm × 3.00 mm.

Feature Summary

• Provides general-purpose remote I/O expansion for microcontroller families via the I2C interface.
• Features latched outputs with high-current drive capability suitable for directly driving LEDs.
• Includes noise filters on SCL and SDA inputs to enhance signal integrity.
• Supports external reset control through a dedicated RESET pin or internal power-on reset.

Applications

• Wearable devices
• Mobile phones
• Gaming consoles
• Servers
• Routers

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct packaging and tape-and-reel specifications. Confirm that the component meets all required environmental standards and RoHS compliance levels before finalizing procurement decisions. Cross-reference the datasheet revision history to ensure compatibility with existing design parameters.

Selection Notes

Select this component when a compact solution for expanding I/O lines is required in space-constrained designs. Ensure the system controller supports the I2C protocol and can handle the specified voltage levels. Consider the thermal characteristics and operating temperature range to match the intended application environment. Verify that the interrupt functionality aligns with the system's event handling requirements.

Part Context

The TCA9537 belongs to the TCA9537 series of I/O expanders from Texas Instruments. It is designed to complement various microcontroller families by providing additional GPIO capabilities over the I2C bus. The DGSR suffix indicates a specific reel-based packaging format used for surface-mount assembly processes.

Replacement Considerations

Consult the Texas Instruments product folder for officially documented alternative part numbers. Verify pinout compatibility and electrical specifications before substituting any components. Ensure that any replacement maintains the same package type and functional requirements.

FAQ

How is the interrupt condition cleared?

The interrupt circuit is reset when data on the port is changed to the original setting or when data is read from the port that generated the interrupt during the acknowledge bit phase.

What happens to the I/O configuration at power-on?

At power-on, all I/O channels are automatically configured as inputs due to the internal power-on reset mechanism.

Can the input polarity be inverted?

Yes, the polarity of the Input Port register can be inverted using the Polarity Inversion register to support active-high or active-low operation.