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PCA9554RGTR Datasheet(PDF) 9 Page - Texas Instruments |
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PCA9554RGTR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 36 page Interrupt Output (INT) Bus Transactions Writes SCL Start Condition Data 1 Valid SDA Write to Port Data Out From Port R/W ACK From Slave ACK From Slave ACK From Slave 1 9 8 7 6 5 4 3 2 Data 1 1 A2 0 1 S 0 0 A1 A0 0 A 0 0 0 0 0 0 0 A A P tpv Data to Port Command Byte Slave Address SCL SDA Data to Register Start Condition R/W ACK From Slave ACK From Slave ACK From Slave 1 9 8 7 6 5 4 3 2 Data 1/0 A2 0 1 S 0 0 A1 A0 0 A 1 0 0 0 0 0 0 A A P Data to Register Command Byte Slave Address PCA9554 www.ti.com ........................................................................................................................................................ SCPS128B – JULY 2006 – REVISED AUGUST 2008 An interrupt is generated by any rising or falling edge of the port inputs in the input mode. After time tiv, the signal INT is valid. Resetting the interrupt circuit is achieved when data on the port is changed to the original setting, and data is read from the port that generated the interrupt or in a Stop event. Resetting occurs in the read mode at the acknowledge (ACK) bit or not acknowledge (NACK) bit after the rising edge of the SCL signal. Interrupts that occur during the ACK or NACK clock pulse can be lost (or be very short) due to the resetting of the interrupt during this pulse. Each change of the I/Os after resetting is detected and is transmitted as INT. Reading from or writing to another device does not affect the interrupt circuit, and a pin configured as an output cannot cause an interrupt. Changing an I/O from an output to an input may cause a false interrupt to occur if the state of the pin does not match the contents of the Input Port register. INT has an open-drain structure and requires a pullup resistor to VCC. Data is exchanged between the master and PCA9554 through write and read commands. Data is transmitted to the PCA9554 by sending the device address and setting the least-significant bit to a logic 0 (see Figure 4 for device address). The command byte is sent after the address and determines which register receives the data that follows the command byte. There is no limitation on the number of data bytes sent in one write transmission. Figure 6. Write to Output Port Register <br/> Figure 7. Write to Configuration or Polarity Inversion Registers Copyright © 2006–2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): PCA9554 Not Recommended for New Designs |
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