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TCA9544APWR Datasheet(PDF) 10 Page - Texas Instruments |
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TCA9544APWR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 29 page Switch Control Logic I2C Bus Control Interrupt Logic Input Filter Power-on Reset TCA9544A SC0 A1 A0 INT INT0 SDA SCL GND SD3 SD2 SD1 SD0 SC3 SC2 SC1 VCC A2 6 9 13 16 5 8 12 15 10 20 18 19 1 2 3 17 INT1 INT2 INT3 4 7 11 14 Output Filter TCA9544A SCPS209A – MAY 2014 – REVISED MAY 2014 www.ti.com 9 Detailed Description 9.1 Overview The TCA9544A is a 4-channel, bidirectional translating I2C switch. The master SCL/SDA signal pair is directed to four channels of slave devices, SC0/SD0-SC3/SD3. Any individual downstream channel can be selected as well as any combination of the four channels. The TCA9544A also supports interrupt signals in order for the master to detect an interrupt on the INT output pin that can result from any of the slave devices connected to the INT3- INT0 input pins. The device can be reset by cycling the power supply, VCC, also known as a power-on reset (POR), which resets the state machine and allows the TCA9544A to recover should one of the downstream I2C buses get stuck in a low state. A POR event will cause all channels to be deselected. The connections of the I2C data path are controlled by the same I2C master device that is switched to communicate with multiple I2C slaves. After the successful acknowledgment of the slave address (hardware selectable by A0-A2 pins), a single 8-bit control register is written to or read from to determine the selected channels and state of the interrupts. The TCA9544A may also be used for voltage translation, allowing the use of different bus voltages on each SCn/SDn pair such that 1.8-V, 2.5-V, or 3.3-V parts can communicate with 5-V parts. This is achieved by using external pull-up resistors to pull the bus up to the desired voltage for the master and each slave channel. 9.2 Functional Block Diagram 10 Submit Documentation Feedback Copyright © 2014, Texas Instruments Incorporated Product Folder Links: TCA9544A |
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