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PCA9538 Datasheet(PDF) 6 Page - NXP Semiconductors |
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PCA9538 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 18 page Philips Semiconductors Product data sheet PCA9538 8-bit I2C and SMBus low power I/O port with interrupt and reset 2004 Oct 05 6 Device address 1 1 1 0 0 A1 A0 SLAVE ADDRESS FIXED HARDWARE SELECTABLE R/W SW02175 Figure 5. PCA9538 address Bus transactions Data is transmitted to the PCA9538 registers using the write mode as shown in Figures 6 and 7. Data is read from the PCA9538 registers using the read mode as shown in Figures 8 and 9. These devices do not implement an auto-increment function so once a command byte has been sent, the register which was addressed will continue to be accessed by reads until a new command byte has been sent. 12 SCL WRITE TO PORT DATA OUT FROM PORT 3 4 567 8 SDA S0 A A A 11 1 0 0A1 A0 DATA 1 slave address data to port start condition R/W acknowledge from slave acknowledge from slave acknowledge from slave tpv DATA 1 VALID SW02176 9 1 00 0 0 00 0 command byte P Figure 6. WRITE to output port register 12 SCL 3 4 567 8 SDA S0 A A A 11 1 0 0A1 A0 DATA slave address data to register start condition R/W acknowledge from slave acknowledge from slave acknowledge from slave SW02177 9 00 0 0 00 1 command byte 1/0 DATA TO REGISTER P Figure 7. WRITE to configuration or polarity inversion registers |
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