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PCA9534DB Datasheet(PDF) 9 Page - Texas Instruments |
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PCA9534DB Datasheet(HTML) 9 Page - Texas Instruments |
9 / 32 page www.ti.com Reads A2 0 1 S 0 0 A1 A0 0 A A Data from Register Slave Address Slave Address R/W ACK From Slave Command Byte ACK From Slave S A2 0 1 0 0 A1 A0 R/W 1 A Data A ACK From Master Data Data from Register NACK From Master NA P Last Byte ACK From Slave SCL SDA INT Start Condition R/W Read From Port Data Into Port Stop Condition ACK From Master NACK From Master ACK From Slave Data From Port Slave Address Data From Port 1 9 8 7 6 5 4 3 2 A2 0 1 S 0 0 A1 A0 0 A Data 1 Data 4 A NA P Data 2 Data 3 Data 4 tiv tph tps tir Data 5 PCA9534 REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH INTERRUPT OUTPUT AND CONFIGURATION REGISTERS SCPS124B – SEPTEMBER 2006 – REVISED FEBRUARY 2007 The bus master first must send the PCA9534 address with the least-significant bit set to a logic 0 (see Figure 4 for device address). The command byte is sent after the address and determines which register is accessed. After a restart, the device address is sent again but, this time, the least-significant bit is set to a logic 1. Data from the register defined by the command byte then is sent by the PCA9534 (see Figure 8 and Figure 9). After a restart, the value of the register defined by the command byte matches the register being accessed when the restart occurred. Data is clocked into the register on the rising edge of the ACK clock pulse. There is no limitation on the number of data bytes received in one read transmission, but when the final byte is received, the bus master must not acknowledge the data. Figure 8. Read From Register <br/> A. This figure assumes that the command byte has previously been programmed with 00h. B. Transfer of data can be stopped at any moment by a stop condition. C. This figure eliminates the command byte transfer, a restart and slave address call between the initial slave address call and the actual data transfer from the P Port. See Figure 8 for these details. Figure 9. Read Input Port Register 9 Submit Documentation Feedback |
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