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Texas Instruments TCAL6408 I2C-Bus/SMBus I/O Expander

Texas Instruments TCAL6408 I2C-Bus/SMBus I/O Expander provides general-purpose parallel input/output (I/O) expansion for the two-line bidirectional I2C bus (or SMBus) protocol. The device can operate with a power supply voltage ranging from 1.08V to 3.6V on the I2C bus side (VCCI) and a power supply voltage from 1.08V to 3.6V on the P-port side (VCCP).

The device supports 100kHz (Standard-mode), 400kHz (Fast-mode), and 1MHz (fast-mode-plus) I2C clock frequencies. I/O expanders such as the TCAL6408 provide a simple solution when additional I/Os are needed for switches, sensors, push buttons, LEDs, fans, etc.

The Texas Instruments TCAL6408 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 other features are programmable output drive strength, pull-up and pull-down resistors, latchable inputs, maskable interrupt, interrupt status register, and programmable open-drain or push-pull outputs.

Features

  • Operating power-supply voltage range of 1.08V to 3.6V
  • Allows bidirectional voltage-level translation and GPIO expansion between 1.2V, 1.8V, 2.5V, and 3.3V I2C bus and p-ports
  • Low standby current consumption of 1µA typical at 1.8V
  • 1MHz fast mode plus I2C bus
  • Hardware address pin allows two devices on the same I2C, 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
    • 4000V Human-body model (A114-A)
    • 1000V Charged-device model (C101)

Applications

  • Servers
  • Routers (telecom switching equipment)
  • Personal computers
  • Personal electronics
  • Industrial automation
  • Gaming consoles
  • Products with GPIO-limited processors

Simplified Schematic

Schematic - Texas Instruments TCAL6408 I2C-Bus/SMBus I/O Expander
Published: 2023-02-24 | Updated: 2024-01-25