2-Wire, 5-Bit DAC with Three Digital Outputs

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2-Wire Communication

Writing to a Slave: The master must generate a START

condition, write the slave address (R/W = 0), write the

memory address, write the byte of data, and generate a

STOP condition. Remember the master must read the

slave’s acknowledgement during all byte-write opera-

tions. See Figure 2 for the write command example.

Reading from a Slave: To read from the slave, the

master generates a START condition, writes the slave

address with R/W = 1, receives an ACK from the slave,

reads a memory address of 00h from the slave, sends

an ACK to the slave, reads the data byte, then sends

an ACK to indicate the end of the transfer, and gener-

ates a STOP condition. See Figure 2 for the read com-

mand example.

Application Information

Power-Supply Decoupling

To achieve the best results when using the DS4302,

decouple the power supply with a 0.01µF or a 0.1µF

capacitor. Use high-quality, ceramic, surface-mount

capacitors, and mount the capacitors as close as pos-

mize lead inductance.

SDA and SCL Pullup Resistors

Pullup resistor values for SDA and SCL should be cho-

sen to ensure that the rise and fall times listed in the AC

electrical characteristics are within specification.

Package Information

For the latest package outline information, go to

www.maxim-ic.com/DallasPackInfo.

Chip Information

TRANSISTOR COUNT: 2428

SUBSTRATE CONNECTED TO GROUND