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Low Voltage 8-BIT I2C and SMBus I/O Expander (TCA9554A)

2017-01-10 19:28  
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I2C IO Expander Schematic This article describes the Low Voltage 8-BIT I2C and SMBus I / O Expander (TCA9554A). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: TCA9554A.

This 8-bit I/O expander for the two-line bidirectional bus (I2C) is designed for 1.65-V to 5.5-VVCCoperation. It provides general-purpose remote I/O expansion for most microcontroller families via the I2C interface [serial clock (SCL), serial data (SDA)].

The TCA9554A consists of one 8-bit Configuration (input or output selection), Input, Output, and Polarity Inversion (active high or active low) registers. At power on, the I/Os are configured as inputs with a weak pullup toVCC. However, the system master can enable the I/Os as either inputs or outputs by writing to the I/O configuration 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.

I2C to Parallel Port ExpanderOpen-Drain Active-Low Interrupt OutputOperating Power-Supply Voltage Range of 1.65 V to 5.5 V5-V Tolerant I/Os400-kHz Fast I2C BusThree Hardware Address Pins Allow up to Eight Devices on the I2C/SMBusInput/Output Configuration RegisterPolarity Inversion RegisterInternal Power-On ResetPower-Up With All Channels Configured as InputsNo Glitch on Power UpLatched Outputs With High-Current Drive Maximum Capability for Directly DrivingLEDsLatch-Up Performance Exceeds 100 mA PerJESD78, Class IIESDProtection ExceedsJESD222000-V Human-Body Model (A114-A)200-V Machine Model (A115-A)1000-V Charged-Device Model (C101)


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