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PCA9550 Datasheet(PDF) 7 Page - NXP Semiconductors |
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PCA9550 Datasheet(HTML) 7 Page - NXP Semiconductors |
7 / 17 page Philips Semiconductors Product data PCA9550 2-bit I2C LED driver with programmable blink rates 2003 May 02 7 Bus transactions 0A0 12 SCL WRITE TO REGISTER DATA OUT FROM PORT 3 4 567 8 SDA S0 A A A 11 0 0 0 DATA 1 slave address data to register start condition R/W acknowledge from slave acknowledge from slave acknowledge from slave tpv DATA 1 VALID SW01014 9 B0 0 0 0 AI 0 B2 B1 command byte Figure 9. WRITE to register 0 0 0 0 0 0 A0 1 1 0 0 A0 1 1 S0 A A A acknowledge from slave R/W acknowledge from slave A P NA acknowledge from slave acknowledge from master S DATA DATA R/W first byte at this moment master-transmitter becomes master-receiver and slave-receiver becomes slave-transmitter last byte SW01098 no acknowledge from master 1 slave address data from register data from register slave address auto-increment register address if AI = 1 0 0 0 AI 0B2 B1 B0 Figure 10. READ from register 11 0 0 0 0 A0 READ FROM PORT DATA INTO PORT SDA S1 A A DATA 1 DATA 4 slave address data from port data from port start condition R/W acknowledge from slave acknowledge from master stop condition tps DATA 4 DATA 2 P DATA 3 tph SW01095 no acknowledge from master NA DATA 1 NOTES: 1. This figure assumes the command byte has previously been programmed with 00h. Figure 11. READ input port register |
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