Product details

Number of I/Os 16 Features Configuration registers, Interrupt pin Supply voltage (Min) (V) 2.3 Supply voltage (Max) (V) 5.5 Addresses 8 Rating Catalog Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85
Number of I/Os 16 Features Configuration registers, Interrupt pin Supply voltage (Min) (V) 2.3 Supply voltage (Max) (V) 5.5 Addresses 8 Rating Catalog Frequency (Max) (kHz) 400 Operating temperature range (C) -40 to 85
SOIC (DW) 24 160 mm² 15.5 x 10.3 SSOP (DB) 24 64 mm² 8.2 x 7.8 SSOP (DBQ) 24 52 mm² 8.65 x 6 TVSOP (DGV) 24 32 mm² 5 x 6.4 VQFN (RGE) 24 16 mm² 4 x 4
  • Low standby-current consumption of 1 µA Max
  • I2C to Parallel port expander
  • Open-drain active-low interrupt output
  • 5-V Tolerant I/O ports
  • Compatible with most microcontrollers
  • 400-kHz Fast I2C Bus
  • Address by three hardware address pins for use of up to eight devices
  • Polarity inversion register
  • Latched outputs with high-current drive capability for directly driving LEDs
  • Latch-up performance exceeds 100 mA Per JESD 78, class II
  • ESD Protection exceeds JESD 22
    • 2000-V Human-body model (A114-A)
    • 1000-V Charged-device model (C101)
  • Low standby-current consumption of 1 µA Max
  • I2C to Parallel port expander
  • Open-drain active-low interrupt output
  • 5-V Tolerant I/O ports
  • Compatible with most microcontrollers
  • 400-kHz Fast I2C Bus
  • Address by three hardware address pins for use of up to eight devices
  • Polarity inversion register
  • Latched outputs with high-current drive capability for directly driving LEDs
  • Latch-up performance exceeds 100 mA Per JESD 78, class II
  • ESD Protection exceeds JESD 22
    • 2000-V Human-body model (A114-A)
    • 1000-V Charged-device model (C101)

INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C bus. Thus, the PCA9535 can remain a simple slave device.

The device outputs (latched) have high-current drive capability for directly driving LEDs. The device has low current consumption.

Although pin-to-pin and I2C address compatible with the PCF8575, software changes are required due to the enhancements.

The PCA9535 is identical to the PCA9555, except for the removal of the internal I/O pullup resistor, which greatly reduces power consumption when the I/Os are held low.

Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address and allow up to eight devices to share the same I2C bus or SMBus. The fixed I2C address of the PCA9535 is the same as the PCA9555, PCF8575, PCF8575C, and PCF8574, allowing up to eight of these devices in any combination to share the same I2C bus or SMBus.

INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C bus. Thus, the PCA9535 can remain a simple slave device.

The device outputs (latched) have high-current drive capability for directly driving LEDs. The device has low current consumption.

Although pin-to-pin and I2C address compatible with the PCF8575, software changes are required due to the enhancements.

The PCA9535 is identical to the PCA9555, except for the removal of the internal I/O pullup resistor, which greatly reduces power consumption when the I/Os are held low.

Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address and allow up to eight devices to share the same I2C bus or SMBus. The fixed I2C address of the PCA9535 is the same as the PCA9555, PCF8575, PCF8575C, and PCF8574, allowing up to eight of these devices in any combination to share the same I2C bus or SMBus.

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Technical documentation

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Type Title Date
* Data sheet PCA9535 Remote 16-BIT I2C and SMBus Low-Power I/O Expander With Interrupt Output and Configuration Registers datasheet (Rev. K) 11 Mar 2021
Application note I2C Dynamic Addressing 25 Apr 2019
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note Choosing the Correct I2C Device for New Designs 07 Sep 2016
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dec 2015
Application note Understanding the I2C Bus 30 Jun 2015
Application note Maximum Clock Frequency of I2C Bus Using Repeaters 15 May 2015
Application note I2C Bus Pull-Up Resistor Calculation 13 Feb 2015
Application note Programming Fun Lights With TI's TCA6507 30 Nov 2007
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004

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Package Pins Download
SOIC (DW) 24 View options
SSOP (DB) 24 View options
SSOP (DBQ) 24 View options
TSSOP (PW) 24 View options
TVSOP (DGV) 24 View options
VQFN (RGE) 24 View options
WQFN (RTW) 24 View options

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