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PCA9550DP Datasheet(PDF) 10 Page - NXP Semiconductors |
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PCA9550DP Datasheet(HTML) 10 Page - NXP Semiconductors |
10 / 26 page PCA9550_5 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 05 — 13 October 2008 10 of 26 NXP Semiconductors PCA9550 2-bit I2C-bus LED driver with programmable blink rates 7.4 Bus transactions Fig 11. Write to register 0 A S slave address START condition R/W acknowledge from slave 002aad268 0 0 AI 0 B2B1B0 0 command byte A acknowledge from slave 12345678 SCL 9 SDA DATA 1 A write to register data out from port tv(Q) acknowledge from slave DATA 1 VALID data to register 10000 A0 1 Fig 12. Read from register 10000 A0 0 A S1 START condition R/W acknowledge from slave 002aad269 A acknowledge from slave SDA A P acknowledge from master data from register DATA (first byte) slave address STOP condition S (repeated) START condition (cont.) (cont.) 1 A R/W acknowledge from slave slave address at this moment master-transmitter becomes master-receiver and slave-receiver becomes slave-transmitter NA no acknowledge from master data from register DATA (last byte) command byte 0 0 AI 0 B2 B1 0B0 Auto-Increment register address if AI = 1 10000 A0 1 Remark: This figure assumes the command byte has previously been programmed with 00h. Fig 13. Read input port register 10000 A0 1 A S1 START condition R/W acknowledge from slave 002aad270 A acknowledge from master SDA NA read from port data into port P th(D) data from port no acknowledge from master data from port DATA 4 slave address DATA 1 STOP condition DATA 2 DATA 3 DATA 4 tsu(D) DATA 1 |
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