Electronic Components Datasheet Search |
|
PCF8594C-2P Datasheet(PDF) 7 Page - NXP Semiconductors |
|
PCF8594C-2P Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 24 page 1997 Feb 13 7 Philips Semiconductors Product specification 256 to 1024 × 8-bit CMOS EEPROMs with I2C-bus interface PCF85xxC-2 family 8I2C-BUS PROTOCOL The I2C-bus is for 2-way, 2-line communication between different ICs or modules. The serial bus consists of two bidirectional lines: one for data signals (SDA), and one for clock signals (SCL). Both the SDA and SCL lines must be connected to a positive supply voltage via a pull-up resistor. The following protocol has been defined: • Data transfer may be initiated only when the bus is not busy. • During data transfer, the data line must remain stable whenever the clock line is HIGH. Changes in the data line while the clock line is HIGH will be interpreted as control signals. 8.1 Bus conditions The following bus conditions have been defined: • Bus not busy: both data and clock lines remain HIGH. • Start data transfer: a change in the state of the data line, from HIGH-to-LOW, while the clock is HIGH, defines the START condition. • Stop data transfer: a change in the state of the data line, from LOW-to-HIGH, while the clock is HIGH, defines the STOP condition. • Data valid: the state of the data line represents valid data when, after a START condition, the data line is stable for the duration of the HIGH period of the clock signal. There is one clock pulse per bit of data. 8.2 Data transfer Each data transfer is initiated with a START condition and terminated with a STOP condition. The number of the data bytes, transferred between the START and STOP conditions is limited to 7 bytes in the E/W mode and 8 bytes in the page E/W mode. Data transfer is unlimited in the read mode. The information is transmitted in bytes and each receiver acknowledges with a ninth bit. Within the I2C-bus specifications a low-speed mode (2 kHz clock rate) and a high speed mode (100 kHz clock rate) are defined. The PCF85xxC-2 operates in both modes. By definition a device that sends a signal is called a ‘transmitter’, and the device which receives the signal is called a ‘receiver’. The device which controls the signal is called the ‘master’. The devices that are controlled by the master are called ‘slaves’. Each byte is followed by one acknowledge bit. This acknowledge bit is a HIGH level, put on the bus by the transmitter. The master generates an extra acknowledge related clock pulse. The slave receiver which is addressed is obliged to generate an acknowledge after the reception of each byte. The master receiver must generate an acknowledge after the reception of each byte that has been clocked out of the slave transmitter. The device that acknowledges has to pull down the SDA line during the acknowledge clock pulse in such a way that the SDA line is stable LOW during the HIGH period of the acknowledge related clock pulse. Set-up and hold times must be taken into account. A master receiver must signal an end of data to the slave transmitter by not generating an acknowledge on the last byte that has been clocked out of the slave. In this event the transmitter must leave the data line HIGH to enable the master generation of the STOP condition. |
Similar Part No. - PCF8594C-2P |
|
Similar Description - PCF8594C-2P |
|
|
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 |