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TCA9554A Datasheet(PDF) 2 Page - Texas Instruments |
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TCA9554A Datasheet(HTML) 2 Page - Texas Instruments |
2 / 33 page TCA9554A SCPS196 – DECEMBER 2010 www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) INT can be connected to the interrupt input of a microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I2C bus. Thus, the TCA9554A can remain a simple slave device. The device's outputs (latched) have high-current drive capability for directly driving LEDs and low current consumption. Three hardware pins (A0, A1, and A2) are used to program and vary the fixed I2C address and allow up to eight devices to share the same I2C bus or SMBus. The TCA9554A is pin-to-pin and I2C address compatible with the PCF8574A. However, software changes are required, due to the enhancements in the TCA9554A over the PCF8574A. The TCA9554A and PCA9554 are identical except for their fixed I2C address. This allows for up to 16 of these devices (8 of each) on the same I2C/SMBus. ORDERING INFORMATION TA PACKAGE(1) (2) ORDERABLE PART NUMBER TOP-SIDE MARKING –40°C to 85°C TSSOP – PW Reel of 2000 TCA9554APWR PW554A (1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. (2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. 2 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): TCA9554A |
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