PCA9532 16-bit I C LED dimmer - E-LAB Computers

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Philips Semiconductors16-bit I 2 C LED dimmerProduct dataPCA9532SDASCLMASTERTRANSMITTER/RECEIVERSLAVERECEIVERSLAVETRANSMITTER/RECEIVERMASTERTRANSMITTERMASTERTRANSMITTER/RECEIVERI 2 CMULTIPLEXERSLAVESW00366Figure 8. System configurationAcknowledgeThe number of data bytes transferred between the start and the stop conditions from transmitter to receiver is not limited. Each byte of eight bitsis followed by one acknowledge bit. The acknowledge bit is a HIGH-level put on the bus by the transmitter whereas the master generates anextra acknowledge related clock pulse.A slave receiver which is addressed must generate an acknowledge after the reception of each byte. Also a master must generate anacknowledge after the reception of each byte that has been clocked out of the slave transmitter. The device that acknowledges has to pull downthe SDA line during the acknowledge clock pulse, so that the SDA line is stable LOW during the HIGH period of the acknowledge related clockpulse, set-up and hold times must be taken into account.A master receiver must signal an end of data to the transmitter by not generating an acknowledge on the last byte that has been clocked out ofthe slave. In this event, the transmitter must leave the data line HIGH to enable the master to generate a stop condition.DATA OUTPUTBY TRANSMITTERDATA OUTPUTBY RECEIVERnot acknowledgeacknowledgeSCL FROMMASTER1 2 8 9SSTART conditionclock pulse foracknowledgementSW00368Figure 9. Acknowledgement on the I 2 C-bus2003 May 02 8
Philips Semiconductors16-bit I 2 C LED dimmerProduct dataPCA9532Bus transactionsSCL1 23 4 5 6 7 89slave addresscommand bytedata to registerSDA S 1 1 0 0 A2 A1 A0 0 A 0 0 0 AI B3 B2 B1 B0 A DATA 1Astart condition R/W acknowledgefrom slaveacknowledgefrom slaveacknowledgefrom slaveWRITE TOREGISTERDATA OUTFROM PORTDATA 1 VALIDt pvFigure 10. WRITE to registerSW02000slave addressacknowledgefrom slaveacknowledgefrom slaveslave addressacknowledgefrom slavedata from registeracknowledgefrom masterS 1 1 0 0 A2 A1 A0 0 A 0 0 0 AI B3 B2 B1 B0 A S 1 1 0 0 A2 A1 A0 1 ADATAAR/Wat this moment master-transmitterbecomes master-receiver andslave-receiver becomesslave-transmitterR/Wfirst byteauto-incrementregister addressif AI = 1data from registerno acknowledgefrom masterDATANAPlast byteSW01099Figure 11. READ from registerslave address data from port data from portSDA S 1 1 0 0 A2 A1 A0 1 A DATA 1 ADATA 4NAPstart condition R/W acknowledgefrom slaveacknowledgefrom masterno acknowledgefrom masterstopconditionREAD FROMPORTDATA INTOPORTDATA 1t phDATA 2DATA 3t psDATA 4SW01096NOTE:1. This figure assumes the command byte has previously been programmed with 00h.Figure 12. READ input port register2003 May 02 9
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PCA9532 16-bit I C LED dimmer - E-LAB Computers

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