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DS3903E-020 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS3903E-020 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 11 page Triple 128-Position Nonvolatile Digital Potentiometer 8 ______________________________________________________________________ word consists of 101000 binary followed by A0 then the R/W bit. If the R/W bit is high, a read operation is initiat- ed. If the R/W bit is low, a write operation is initiated. For a device to become active, the value of A0 must be the same as the hard-wired address pins on the DS3903. Upon a match of written and hard-wired addresses, the DS3903 outputs a zero for one clock cycle as an acknowledge. If the address does not match, the DS3903 returns to a low-power mode. Write Operations After receiving a matching device address byte with the R/W bit set low, the device goes into the write mode of operation. The master must transmit an 8-bit EEPROM memory address to the device to define the address where the data is to be written. After the byte has been received, the DS3903 transmits a zero for one clock cycle to acknowledge the memory address has been received. The master must then transmit an 8-bit data word to be written into this memory address. The DS3903 again transmits a zero for one clock cycle to acknowledge the receipt of the data byte. At this point, the master must terminate the write operation with a stop condition. The DS3903 then enters an internally timed STOP CONDITION OR REPEATED START CONDITION REPEATED IF MORE BYTES ARE TRANSFERRED ACK START CONDITION ACK ACKNOWLEDGEMENT SIGNAL FROM RECEIVER ACKNOWLEDGEMENT SIGNAL FROM RECEIVER SLAVE ADDRESS MSB SCL SDA R/W DIRECTION BIT 12 6 7 8 9 12 8 9 3–7 Figure 2. 2-Wire Data Transfer Protocol SDA SCL tHD:STA tLOW tHIGH tR tF tBUF tHD:DAT tSU:DAT REPEATED START tSU:STA tHD:STA tSU:STO tSP STOP START Figure 3. 2-Wire AC Characteristics |
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