Electronic Components Datasheet Search |
|
PCF8574APWE4 Datasheet(PDF) 2 Page - Texas Instruments |
|
PCF8574APWE4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 21 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) 14 I/O Port 4 5 6 7 9 10 11 12 P0 P1 P2 P3 P4 P5 P6 P7 Shift Register 8 Bit LP Filter Interrupt Logic Input Filter 15 Power-On Reset Read Pulse Write Pulse PCF8574A 3 2 1 13 16 8 GND VCC SDA SCL A2 A1 A0 INT Pin numbers shown are for the DW and N packages. I2C Bus Control PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS SCPS069D – JULY 2001 – REVISED OCTOBER 2005 The PCF8574A 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 PCF8574A can remain a simple slave device. LOGIC DIAGRAM (POSITIVE LOGIC) 2 |
Similar Part No. - PCF8574APWE4 |
|
Similar Description - PCF8574APWE4 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |