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DS1077Z-125 Datasheet(PDF) 9 Page - Dallas Semiconductor

Part No. DS1077Z-125
Description  EconOscillator/Divider
Download  21 Pages
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Manufacturer  DALLAS [Dallas Semiconductor]
Direct Link  https://www.maximintegrated.com/en.html
Logo DALLAS - Dallas Semiconductor

DS1077Z-125 Datasheet(HTML) 9 Page - Dallas Semiconductor

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DS1077
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DATA TRANSFER ON 2-WIRE SERIAL BUS Figure 2
MSB
slave address
R/W
direction
bit
SDA
SCL
START
CONDITION
12
678
9
12
8
9
STOP CONDITION
OR
REPEATED
START CONDITION
3 - 8
acknowledgement
signal from receiver
acknowledgement
signal from receiver
ACK
ACK
repeated if more bytes
are transferred
Figure 2 details how data transfer is accomplished on the 2-wire bus. Depending upon the state of the
R/ W bit, two types of data transfer are possible:
1) Data transfer from a master transmitter to a slave receiver. The first byte transmitted by the
master is the slave address. Next, follows a number of data bytes. The slave returns an acknowledge
bit after each received byte.
2) Data transfer from a slave transmitter to a master receiver. The first byte (the slave address) is
transmitted by the master. The slave then returns an acknowledge bit. Next, follows a number of data
bytes transmitted by the slave to the master. The master returns an acknowledge bit after all received
bytes other than the last byte. At the end of the last received byte, a not acknowledge is returned.
The master device generates all of the serial clock pulses and the START and STOP conditions. A
transfer is ended with a STOP condition or with a repeated START condition. Since a repeated START
condition is also the beginning of the next serial transfer, the bus will not be released.
The DS1077 may operate in the following two modes:
1) Slave receiver mode: Serial data and clock are received through SDA and SCL. After each byte is
received, an acknowledge bit is transmitted. START and STOP conditions are recognized as the
beginning and end of a serial transfer. Address recognition is performed by hardware after the slave
address and direction bit have been received.
2) Slave transmitter mode: The first byte is received and handled as in the slave receiver mode.
However, in this mode, the direction bit will indicate that the transfer direction is reversed. Serial data
is transmitted on SDA by the DS1077 while the serial clock is input on SCL. START and STOP
conditions are recognized as the beginning and end of a serial transfer.


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