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PCA9551BS Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA9551BS Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 21 page Philips Semiconductors Product data sheet PCA9551 8-bit I2C LED driver with programmable blink rates 2004 Oct 01 7 CHARACTERISTICS OF THE I2C-BUS The I2C-bus is for 2-way, 2-line communication between different ICs or modules. The two lines are a serial data line (SDA) and a serial clock line (SCL). Both lines must be connected to a positive supply via a pull-up resistor when connected to the output stages of a device. Data transfer may be initiated only when the bus is not busy. Bit transfer One data bit is transferred during each clock pulse. The data on the SDA line must remain stable during the HIGH period of the clock pulse as changes in the data line at this time will be interpreted as control signals (see Figure 6). SDA SCL SW00363 data line stable; data valid change of data allowed Figure 6. Bit transfer Start and stop conditions Both data and clock lines remain HIGH when the bus is not busy. A HIGH-to-LOW transition of the data line, while the clock is HIGH is defined as the start condition (S). A LOW-to-HIGH transition of the data line while the clock is HIGH is defined as the stop condition (P) (see Figure 7). System configuration A device generating a message is a transmitter: a device receiving is the receiver. The device that controls the message is the master and the devices which are controlled by the master are the slaves (see Figure 8). SDA SCL SW00365 S P SDA SCL START condition STOP condition Figure 7. Definition of start and stop conditions MASTER TRANSMITTER/ RECEIVER SLAVE RECEIVER SLAVE TRANSMITTER/ RECEIVER MASTER TRANSMITTER MASTER TRANSMITTER/ RECEIVER SDA SCL SW00366 I2C MULTIPLEXER SLAVE Figure 8. System configuration |
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