Product
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TCAL9539-Q1
  • TCAL9539-Q1
  • TCAL9539-Q1
  • TCAL9539-Q1
  • TCAL9539-Q1
  • TCAL9539-Q1

TCAL9539-Q1

ACTIVE

Automotive 16-bit low voltage I²C/SMBus I/O expander w/interrupt, reset and agile I/O configuration

Texas Instruments TCAL9539-Q1 Product Info

1 April 2026 4

Parameters

Number of I/Os

16

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

Automotive

Frequency (max) (MHz)

1

Operating temperature range (°C)

-40 to 125

TI functional safety category

Functional Safety-Capable

Package

WQFN (RTW)-24-16 mm² 4 x 4

Features

  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, T A
  • Functional safety-capable
  • 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 AEC Q100-004
  • ESD protection exceeds AEC - Q100 requirements
    • 4000-V Human-body model (AEC - Q100-002)
    • 1000-V Charged-device model (AEC - Q100-011)
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, T A
  • Functional safety-capable
  • 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 AEC Q100-004
  • ESD protection exceeds AEC - Q100 requirements
    • 4000-V Human-body model (AEC - Q100-002)
    • 1000-V Charged-device model (AEC - Q100-011)

Description

The TCAL9539-Q1 device provides general purpose parallel input/output (I/O) expansion for the two-line bidirectional I 2C 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 TCAL9539-Q1 provide a simple solution when additional I/Os are needed for switches, sensors, push-buttons, LEDs, fans, and so on.

The TCAL9539-Q1 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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