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TCAL9538

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Low-voltage 8-bit I²C-bus/SMBus I/O expander with interrupt, reset and agile I/O configuration

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Data sheet

TCAL9538

ACTIVE
Data sheet Order now

Product details

Number of I/Os 8 Features 1-MHz maximum frequency, Adjustable I/O level, Configuration registers, Interrupt pin, Reset pin Supply voltage (min) (V) 1.08 Supply voltage (max) (V) 3.6 Addresses 4 Rating Catalog Frequency (max) (MHz) 1 Operating temperature range (°C) -40 to 125
Number of I/Os 8 Features 1-MHz maximum frequency, Adjustable I/O level, Configuration registers, Interrupt pin, Reset pin Supply voltage (min) (V) 1.08 Supply voltage (max) (V) 3.6 Addresses 4 Rating Catalog Frequency (max) (MHz) 1 Operating temperature range (°C) -40 to 125
TSSOP (PW) 16 32 mm² 5 x 6.4 UQFN (RSV) 16 4.68 mm² 2.6 x 1.8 X2QFN (DTU) 16 2.56 mm² 1.6 x 1.6
  • Operating power-supply voltage range of 1.08 V to 3.6 V
  • Low standby current consumption of 1 µA typical at 1.8 V
  • 1-MHz fast mode plus I 2C bus
  • Hardware address pin allows two devices on the same I 2C, SMBus bus
  • Active-low reset input ( RESET )
  • Open-drain active-low interrupt output ( INT )
  • Input or output configuration register
  • Polarity inversion register
  • Configurable I/O drive strength register
  • Pull-up and pull-down resistor configuration register
  • Internal power-on reset
  • Noise filter on SCL or SDA inputs
  • Latched outputs with high-current drive maximum capability for directly driving LEDs
  • Latch-up performance exceeds 100 mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 4000-V Human-body model (A114-A)
    • 1000-V Charged-device model (C101)
  • Operating power-supply voltage range of 1.08 V to 3.6 V
  • Low standby current consumption of 1 µA typical at 1.8 V
  • 1-MHz fast mode plus I 2C bus
  • Hardware address pin allows two devices on the same I 2C, SMBus bus
  • Active-low reset input ( RESET )
  • Open-drain active-low interrupt output ( INT )
  • Input or output configuration register
  • Polarity inversion register
  • Configurable I/O drive strength register
  • Pull-up and pull-down resistor configuration register
  • Internal power-on reset
  • Noise filter on SCL or SDA inputs
  • Latched outputs with high-current drive maximum capability for directly driving LEDs
  • Latch-up performance exceeds 100 mA per JESD 78, class II
  • ESD protection exceeds JESD 22
    • 4000-V Human-body model (A114-A)
    • 1000-V Charged-device model (C101)

The TCAL9538 device provides general purpose parallel input/output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol and is designed for 1.08-V to 3.6-V V CC operation.

The device supports 100-kHz (Standard-mode), 400-kHz (Fast-mode), and 1-MHz (fast-mode-plus) I 2C clock frequencies. I/O expanders such as the TCAL9538 provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so on.

The TCAL9538 has Agile I/O ports which include additional features designed to enhance the I/O performance in terms of speed, power consumption and EMI. The additional features are: programmable output drive strength, programmable pull-up and pull-down resistors, latchable inputs, maskable interrupt, interrupt status register, and programmable open-drain or push-pull outputs.

The TCAL9538 device provides general purpose parallel input/output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol and is designed for 1.08-V to 3.6-V V CC operation.

The device supports 100-kHz (Standard-mode), 400-kHz (Fast-mode), and 1-MHz (fast-mode-plus) I 2C clock frequencies. I/O expanders such as the TCAL9538 provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so on.

The TCAL9538 has Agile I/O ports which include additional features designed to enhance the I/O performance in terms of speed, power consumption and EMI. The additional features are: programmable output drive strength, programmable pull-up and pull-down resistors, latchable inputs, maskable interrupt, interrupt status register, and programmable open-drain or push-pull outputs.
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Technical documentation

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* Data sheet TCAL95388-Bit I2C-Bus, SMBus I/O Expander With Interrupt Output, Reset, and Agile I/O Configuration Registers datasheet (Rev. A) PDF | HTML 07 Nov 2023
Application note Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) PDF | HTML 03 Jul 2024
Application note Features of TCAL Agile I/O Expanders PDF | HTML 06 Jun 2023

Design & development

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Evaluation board

IO-EXPANDER-EVM — IO-EXPANDER-EVM: I2C and SMBus IO Expander Evaluation Module

The IO expander evaluation module (EVM) lets you evaluate TI's portfolio of SMBus and I2C IO expander line devices. The TCA6424A and TCA9539 come installed on the board. The 24-pin TSSOP footprint also supports TCA6408A, TCA6416A, TCA9534, TCA9534A, TCA9535, TCA9538, TCA9554, TCA9554A and TCA9555.

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TSSOP (PW) 16 Ultra Librarian
UQFN (RSV) 16 Ultra Librarian
X2QFN (DTU) 16 Ultra Librarian
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