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PCF8574PWRE4 Datasheet(PDF) 2 Page - Texas Instruments |
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PCF8574PWRE4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 26 page DESCRIPTION/ORDERING INFORMATION (CONTINUED) PCF8574 SCPS068G – JULY 2001 – REVISED MAY 2008 ............................................................................................................................................................... www.ti.com The PCF8574 provides an open-drain output (INT) that can be connected to the interrupt input of a microcontroller. An interrupt is generated by any rising or falling edge of the port inputs in the input mode. After time, tiv, INT is valid. Resetting and reactivating the interrupt circuit is achieved when data on the port is changed to the original setting or data is read from, or written to, the port that generated the interrupt. Resetting occurs in the read mode at the acknowledge bit after the rising edge of the SCL signal, or in the write mode at the acknowledge bit after the high-to-low transition of the SCL signal. Interrupts that occur during the acknowledge 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, after the next rising clock edge, is transmitted as INT. Reading from, or writing to, another device does not affect the interrupt circuit. 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. Therefore, the PCF8574 can remain a simple slave device. ORDERING INFORMATION TA PACKAGE(1)(2) ORDERABLE PART NUMBER TOP-SIDE MARKING PCF8574N PDIP – N Tube of 25 PCF8574N PCF8574NE4 QFN – RGT Reel of 3000 PCF8574RGTR ZWJ PCF8574RGYR QFN – RGY Reel of 1000 PF574 PCF8574RGYRG4 PCF8574DW Tube of 40 PCF8574DWE4 SOIC – DW PCF8574 –40 °C to 85°C PCF8574DWR Reel of 2000 PCF8574DWRE4 PCF8574PW Tube of 70 PCF8574PWE4 TSSOP – PW PF574 PCF8574PWR Reel of 2000 PCF8574PWRE4 PCF8574DGVR TVSOP – DGV Reel of 2000 PF574 PCF8574DGVRE4 (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 © 2001–2008, Texas Instruments Incorporated Product Folder Link(s): PCF8574 |
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