TCA7408 - 具有中断输出复位 I/O 方向寄存器的低电压 8 位 I2C I/O 扩展器

TCA7408是TI德州仪器公司的一款I2CIO扩展器产品，TCA7408是具有中断输出复位 I/O 方向寄存器的低电压 8 位 I2C I/O 扩展器，本站介绍了TCA7408的封装应用图解、特点和优点、功能等，并给出了与TCA7408相关的TI元器件型号供参考。

TCA7408 - 具有中断输出复位 I/O 方向寄存器的低电压 8 位 I2C I/O 扩展器 - I2CIO扩展器 - I2C - 德州仪器

产品特性

Operating Power-Supply Voltage Range of 1.65 to 3.6 V
Allows Bidirectional Voltage-Level Translation and GPIO Expansion Between 1.8-V, 2.5-V, 3.3-V GPIO Port and
- 1.8-V SCL/SDA
- 2.5-V SCL/SDA
- 3.3-V SCL/SDA
- 5-V SCL/SDA
Standby Current Consumption of < 2 µA at 1.8 V
Active Current Consumption of:
- < 2 µA at 1.8-V 100-kHz Clock
- < 5 µA at 1.8-V 400-kHz Clock
100-kHz, 400-kHz Fast Mode
Internal Power-on-Reset and Watchdog Timer
Fail Safe I2C, INT, and RESET lines
Noise Filter on SCL/SDA and Inputs
Active-Low Reset (RESET) Input
Open-Drain Active-Low Interrupt (INT) Output
Programmable Pull-up/Pull-down Resistors for GPIO Inputs
Programmable Edge Detection for Generating Interrupts
Interrupt Latching
Software Reset
Input/Output Direction Register
Power Up With All Channels Configured as 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
- 2000-V Human-Body Model (A114-A)
- 1000-V Charged-Device Model (C101)
Package: µCSP 16 Ball (4 x 4), 2.0 mm x 2.0 mm, 0.5-mm pitch, 0.55-mm height

产品应用

Personal electronics (e.g. Smartphones, Gaming Consoles, Personal Computers)
Servers, Routers (Telecom Switching Equipment), Industrial Automation
Products with GPIO-Limited Processors

产品说明

TCA7408 is an 8-bit I/O expander for the two-line bidirectional bus (I2C) and is designed to provide general-purpose remote I/O expansion through the I2C interface.

The major benefit of this device is its wide VCC range. It can operate from 1.65 V to 3.6 V on the GPIO-port side and 1.65 V to 5.5 V on the SDA/SCL side. This allows the TCA7408 to interface with next-generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power.

The bidirectional voltage-level translation in the TCA7408 is provided through VCCI. VCCI should be connected to the VCC of the external SCL/SDA lines. The voltage level on the GPIO-port of the TCA7408 is determined by VCCP.

At power on, the I/Os are configured as inputs; however, the system master can enable the I/Os as either inputs or outputs by writing to the I/O direction bits. The data for each input or output is kept in the corresponding Input or Output register. All registers can be read by the system master.

TCA7408 has open-drain interrupt (INT) output pin that goes LOW when the input state of a GPIO-port changes from the input-state default register value. The device also has an interrupt masking feature by which the user can mask the interrupt from an individual GPIO-port.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
TCA7408	µCSP (16)	2.00 mm × 2.00 mm

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