SX1506I091TRT

Overview

The SX1506I091TRT is a 16-channel General Purpose Input/Output (GPIO) expander designed for low-power handheld and battery-operated equipment. It expands I/O capabilities via a standard 400kHz I2C interface. The device features independent operating voltages ranging from 2.5V to 5.5V for all supply rails, allowing level shifting between different voltage domains. It includes fully programmable logic functions, mask-programmable interrupts with edge sensitivity, and Power-On Reset functionality. The component operates within a temperature range of -40°C to +85°C and is housed in an ultra-thin QFN-UT-28 package.

Feature Summary

• Provides 16 bidirectional I/O channels with push/pull outputs and programmable pull-up/pull-down resistors.
• Supports independent voltage operation for core and I/O banks, enabling seamless level shifting between components.
• Integrates fully programmable logic functions similar to a PLD to reduce external logic gate requirements.
• Features open-drain active-low interrupt output with bit-maskable and programmable edge sensitivity.

Applications

• Cell phones and PDAs
• Digital cameras and portable multimedia players
• Notebooks and GPS units
• Industrial automation and ATE systems

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure correct packaging and revision status. Confirm that the QFN-UT-28 package dimensions align with the target PCB land pattern design. Check for any recent product change notifications regarding assembly or material composition updates.

Selection Notes

Select this component when a system requires significant I/O expansion beyond the host microcontroller's capacity. It is suitable for applications needing independent voltage domains for level translation. Consider the integrated programmable logic features if external discrete logic gates can be eliminated to save board space.

Part Context

This part belongs to the SX1504/SX1505/SX1506 family of GPIO expanders. While the SX1504 offers 4 channels and the SX1505 provides 8 channels, the SX1506 specifically delivers 16 channels. All variants share similar architectural features but differ in pin count and channel density, with the SX1506 utilizing a larger QFN-UT-28 package.

Replacement Considerations

SX1505I087TRT (8-channel variant)

FAQ

Does the SX1506 support auto-increment during I2C transactions?

Yes, the SX1506 implements register address auto-increment capability, allowing the master to write or read multiple bytes sequentially without manually updating the register address pointer after each transaction.

How are interrupts managed on the SX1506?

Interrupts are generated on programmed rising or falling edges of any GPIO line. The NINT pin goes low to indicate an event. The interrupt can be cleared by writing 0xFF to the Interrupt Source register or automatically upon reading the Data register.

What is the maximum sink current for the high-sink I/Os?

The high-sink I/Os on the SX1506 can sink up to 24mA. Other I/Os have a maximum sink current of 12mA. There is no specified total sink current limit for the entire device.