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TCA9537

ACTIVE

Remote 4-Bit I²C and SMBus I/O expander with configuration register, interrupt and reset

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Data sheet

TCA9537

ACTIVE
Data sheet Order now

Product details

Number of I/Os 4 Features Configuration registers, Interrupt pin, Reset pin Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 5.5 Addresses 4 Rating Catalog Frequency (max) (MHz) 1 Operating temperature range (°C) -40 to 125
Number of I/Os 4 Features Configuration registers, Interrupt pin, Reset pin Supply voltage (min) (V) 1.65 Supply voltage (max) (V) 5.5 Addresses 4 Rating Catalog Frequency (max) (MHz) 1 Operating temperature range (°C) -40 to 125
VSSOP (DGS) 10 14.7 mm² 3 x 4.9
  • I2C to GPIO expander
  • Operating power-supply voltage range of 1.65 V to 5.5 V
  • 5-V Tolerant I/O ports
  • Software Reset via I2C General Call
  • RESET input pin for external reset control
  • Dedicated INT output
  • 1-MHz Fast mode plus I2C bus
  • Input and output configuration register
  • Polarity inversion register
  • Internal power-on reset
  • Power-up with all channels configured as inputs
  • Noise filter on SCL and SDA inputs
  • Latched outputs with high-current drive maximum capability for directly driving LEDs
  • ESD protection exceeds JESD 22
    • 2000-V Human-body model (A114-A)
    • 1000-V Charged-device model (C101)
  • I2C to GPIO expander
  • Operating power-supply voltage range of 1.65 V to 5.5 V
  • 5-V Tolerant I/O ports
  • Software Reset via I2C General Call
  • RESET input pin for external reset control
  • Dedicated INT output
  • 1-MHz Fast mode plus I2C bus
  • Input and output configuration register
  • Polarity inversion register
  • Internal power-on reset
  • Power-up with all channels configured as inputs
  • Noise filter on SCL and SDA inputs
  • Latched outputs with high-current drive maximum capability for directly driving LEDs
  • ESD protection exceeds JESD 22
    • 2000-V Human-body model (A114-A)
    • 1000-V Charged-device model (C101)

The TCA9537 is a 4-bit I/O expander for the I2C bus and is designed for 1.65-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface.

The system controller can enable the I/Os as either inputs or outputs by writing to the I/O configuration register bits. The data for each input or output is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register.

The TCA9537 open-drain interrupt output (INT) is activated when any input differs from its corresponding Input Port register state and is used to indicate to the system controller that an input state has changed.

The system processor can reset the TCA9537 in the event of a timeout or other improper operation by using an I2C soft reset command, which puts the registers in their default state , or with the use of the RESET pin.

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The TCA9537 is a 4-bit I/O expander for the I2C bus and is designed for 1.65-V to 5.5-V VCC operation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface.

The system controller can enable the I/Os as either inputs or outputs by writing to the I/O configuration register bits. The data for each input or output is kept in the corresponding input or output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register.

The TCA9537 open-drain interrupt output (INT) is activated when any input differs from its corresponding Input Port register state and is used to indicate to the system controller that an input state has changed.

The system processor can reset the TCA9537 in the event of a timeout or other improper operation by using an I2C soft reset command, which puts the registers in their default state , or with the use of the RESET pin.

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* Data sheet TCA9537 Remote 4-Bit I2C and SMBus I/O Expander with Configuration Registers datasheet PDF | HTML 15 Jun 2021
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
User guide TCA9536EVM User's Guide PDF | HTML 01 Sep 2021

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Evaluation board

TCA9536EVM — TCA9536 evaluation module for 4-bit I²C I/O expander

The TCA9536 evaluation module provides the user with options to test both the TCA9536 and TCA9537. The evaluation module allows for adjustable pull-up resistors on SDA/SCL as well as LED indicators on power up and the GPOs.

User guide: PDF | HTML
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