DS75LV 查看數據表（PDF） - Maxim Integrated
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DS75LV Datasheet PDF : 14 Pages
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DS75LV
Digital Thermometer and Thermostat
SDA
SCL
START
CONDITION
Figure 6. START, STOP, and ACK Signals
…
…
ACK (OR NACK)
STOP
FROM RECEIVER CONDITION
Figure 7. Address Byte
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
1
0
0
1
A2
A1
A0
R/W
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
0
0
0
0
0
0
P1
P0
Figure 8. Pointer Byte
General 2-Wire Information
● All data is transmitted MSb first over the 2-wire bus.
● One bit of data is transmitted on the 2-wire bus each
SCL period.
● A pullup resistor is required on the SDA line and, when
the bus is idle, both SDA and SCL must remain in a
logic-high state.
● All bus communication must be initiated with a START
condition and terminated with a STOP condition.
During a START or STOP is the only time SDA is
allowed to change states while SCL is high. At all other
times, changes on the SDA line can only occur when
SCL is low: SDA must remain stable when SCL is high.
● After every 8-bit (1-byte) transfer, the receiving device
must answer with an ACK (or NACK), which takes one
SCL period. Therefore, nine clocks are required for
every one-byte data transfer.
Writing to the DS75LV: To write to the DS75LV, the
master must generate a START followed by an address
byte containing the DS75LV bus address. The value of
the R/W bit must be a 0, which indicates that a write is
about to take place. The DS75LV responds with an ACK
after receiving the address byte. The master then sends
a pointer byte which tells the DS75LV which register is
being written to. The DS75LV again responds with an
ACK after receiving the pointer byte. Following this ACK
the master device must immediately begin transmitting
data to the DS75LV. When writing to the configuration
register, the master must send one byte of data (see
Figure 9b), and when writing to the TOS or THYST registers
the master must send two bytes of data (see Figure 9c).
After receiving each data byte, the DS75LV responds with
an ACK, and the transaction is finished with a STOP from
the master.
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