DS1624
 
 
 
f 1
SLAVE ADDRESS
A control byte is the first byte received following the START condition from the master device. The
control byte consists of a four bit control code; for the DS1624, this is set as 1001 binary for read and
write operations. The next three bits of the control byte are the device select bits (A2, A1, A0). They are
used by the master device to select which of eight devices are to be accessed. These bits are in effect the
three least significant bits of the slave address. The last bit of the control byte (R/
) defines the
operation to be performed. When set to a 1, a read operation is selected, when set to a 0, a write
operation is selected. Following the START condition the DS1624 monitors the SDA bus checking the
device type identifier being transmitted. Upon receiving the 1001 code and appropriate device select bits,
the slave device outputs an acknowledge signal on the SDA line.
 
2-WIRE SERIAL COMMUNICATION WITH DS1624 Figure 3 
 
 
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