PCA9535BS,118

I/o Expanders Overview

The PCA9535BS,118 is a 24-pin CMOS device providing 16 bits of General Purpose parallel Input/Output expansion for I2C-bus and 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 and internal power-on reset functionality. ESD protection exceeds 2000 V HBM per JESD22-A114. The component is housed in an HVQFN24 package with dimensions of 4 x 4 x 0.85 mm.

I/o Expanders Feature Summary

• Provides 16-bit GPIO expansion via I2C/SMBus interface
• Features active LOW open-drain interrupt output
• Includes polarity inversion registers for input data
• Supports up to eight devices sharing the same bus

I/o Expanders Applications

• ACPI power switches
• Sensor interfaces
• Push button scanning
• LED control circuits
• Fan speed monitoring

I/o Expanders Procurement Notes

Verify the specific ordering suffix '118' corresponds to the REEL 13" Q1/T1 packing method as documented in the NXP datasheet. Confirm that the HVQFN24 package variant matches the required board footprint and thermal pad soldering specifications for proper heat conduction and electrical operation.

I/o Expanders Selection Notes

Select this component when 16-bit I/O expansion is required with low power consumption. Ensure the application utilizes an I2C or SMBus master controller compatible with the fixed address structure. Verify that the 2.3 V to 5.5 V supply range aligns with the system voltage rails and that the 400 kHz maximum clock frequency meets communication speed requirements.

I/o Expanders Part Context

This part belongs to the PCA9535 family, which enhances previous NXP I2C expanders by offering higher drive capability and smaller packaging. It is identical to the PCA9555 except for the removal of internal I/O pull-up resistors. The BS suffix specifically denotes the HVQFN24 package version, distinguishing it from SO24 or TSSOP24 variants.

I/o Expanders Replacement Considerations

The PCA9535CPW serves as a pin-compatible alternative in the TSSOP24 package. For open-drain output requirements, the PCA9535C series provides high-impedance outputs. Verify software compatibility due to potential register differences compared to legacy PCF8575 devices.