Electronic Components Datasheet Search |
|
PCF8575C Datasheet(PDF) 6 Page - NXP Semiconductors |
|
PCF8575C Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 24 page 1999 Aug 05 6 Philips Semiconductors Product specification Remote 16-bit I/O expander for I2C-bus PCF8575C 6 FUNCTIONAL DESCRIPTION 6.1 Quasi-bidirectional I/Os The 16 ports (see Fig.3) are entirely independent and can be used either as input or output ports. Input data is transferred from the ports to the microcontroller in the READ mode (see Fig.6). Output data is transmitted to the ports in the WRITE mode (see Fig.5). This quasi-bidirectional I/O can be used as an input or output without the use of a control signal for data direction. At power-on all the I/Os are in 3-state mode. The strong pull-up to VDD (IOHt) allows a fast rising edge into a heavily loaded output. This strong pull-up turns on when the output is written HIGH, and is switched off by the negative edge of SCL. After this short period the output is in 3-state mode. The I/O should be written HIGH before being used as an input. After power-on as all the I/Os are set to 3-state all of them can be used as inputs. Any change in setting of the I/Os as either inputs or outputs can be done with the write mode. Warning: If a HIGH is applied to an I/O which has been written earlier to LOW, a large current (IOL) will flow to VSS (see Chapter 10; note 3). 6.2 Addressing Figures 4, 5 and 6 show the address and timing diagrams. Before any data is transmitted or received the master must send the address of the receiver via the SDA line. The first byte transmitted after the START condition carries the address of the slave device and the read/write bit. The address of the slave device must not be changed between the START and the STOP conditions. The PCF8575C acts as a slave receiver or a slave transmitter. handbook, full pagewidth MGS632 DQ CI CI S FF D IOL IOHt Q S FF to interrupt logic VSS VDD P00 to P07 P10 to 17 write pulse data from shift register power-on reset read pulse data to shift register Fig.3 Simplified schematic diagram of each I/O. MGL541 handbook, halfpage S 0 1 0 0 A2 A1 A0 R/W A slave address Fig.4 Byte containing the slave address and the R/W bits. |
Similar Part No. - PCF8575C |
|
Similar Description - PCF8575C |
|
|
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 |