PCA9535BS1,118

I/o Expanders Overview

The PCA9535BS1,118 is a 24-pin CMOS device providing 16 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications. It operates within an operating power supply voltage range of 2.3 V to 5.5 V and supports clock frequencies from 0 Hz to 400 kHz. The device features 5 V tolerant I/Os, an active LOW interrupt output, and low standby current. It includes noise filters on SCL/SDA inputs, no glitch on power-up, and an internal power-on reset. ESD protection exceeds 2000 V HBM, 200 V MM, and 1000 V CDM. Latch-up testing exceeds 100 mA per JEDEC Standard JESD78. It is offered in the HVQFN24 package.

I/o Expanders Feature Summary

• Provides 16-bit GPIO expansion with individual I/O configuration via Configuration registers.
• Features an active LOW open-drain interrupt output that activates when input states differ from their corresponding Input Port register state.
• Includes a Polarity Inversion register allowing users to invert the polarity of Input port register data.
• Supports up to eight devices sharing the same I2C-bus/SMBus through three hardware address pins.

I/o Expanders Applications

• ACPI power switches
• Sensors
• Pushbuttons
• LEDs
• Fans

I/o Expanders Procurement Notes

Verify the specific ordering suffix '1,118' against official NXP documentation, as standard listings typically reference 'PCA9535BS,118'. Confirm the package type is HVQFN24 and the temperature range is -40°C to +85°C. Ensure compatibility with existing I2C bus addresses and check for any specific marking requirements associated with this variant.

I/o Expanders Selection Notes

Select the PCA9535BS1,118 when a compact HVQFN24 package is required for 16-bit I/O expansion. Choose this over the PCA9535C if push-pull outputs are needed, as the PCA9535C only offers open-drain outputs. Consider the lower power consumption compared to the PCA9555 due to the absence of internal I/O pull-up resistors. Verify that the 5 V tolerance meets system interface requirements.

I/o Expanders Part Context

The PCA9535 series enhances the NXP Semiconductors family of I2C-bus I/O expanders by offering higher drive capability, 5 V I/O tolerance, lower supply current, and smaller packaging options. The PCA9535 is identical to the PCA9555 except for the removal of internal I/O pull-up resistors, which reduces power consumption when I/Os are held LOW. It is pin-to-pin and I2C-bus address compatible with the PCF8575, though software changes may be required.

I/o Expanders Replacement Considerations

The PCA9535C is a variant with high-impedance open-drain outputs instead of totem pole outputs. Other package variants include SO24 (PCA9535D), TSSOP24 (PCA9535PW), and HWQFN24 (PCA9535HF). Software adjustments are necessary when replacing PCF8575 devices due to architectural enhancements.