DS75U+T&R【PDF 11/14 页】IC THERMOMETER/STAT DIG 8-MSOP

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Sheet目录40

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DS75

11 of 14

START Condition: Signal generated by the master to indicate the beginning of a data transfer on the

bus. The master generates a START condition by pulling SDA from high to low while SCL is high (see

Figure 6). A repeated START is sometimes used at the end of a data transfer (instead of a STOP) to

indicate that the master will perform another operation.

STOP Condition: Signal generated by the master to indicate the end of a data transfer on the bus. The

master generates a STOP condition by transitioning SDA from low to high while SCL is high (see Figure

6). After the STOP is issued, the master releases the bus to its idle state.

Acknowledge (ACK): When a device (either master or slave) is acting as a receiver, it must generate an

acknowledge (ACK) on the SDA line after receiving every byte of data. The receiving device performs an

ACK by pulling the SDA line low for an entire SCL period (see Figure 6). During the ACK clock cycle,

the transmitting device must release SDA. A variation on the ACK signal is the not acknowledge

(NACK). When the master device is acting as a receiver, it uses a NACK instead of an ACK after the last

data byte to indicate that it is finished receiving data. The master indicates a NACK by leaving the SDA

line high during the ACK clock cycle.

Slave Address: Every slave device on the bus has a unique 7-bit address that allows the master to access

that device. The DS75s 7-bit bus address is 1 0 0 1 A

, where A

, A

and A

are user-selectable via

the corresponding input pins. The three address pins allow up to eight DS75s to be multi-dropped on the

same bus.

Address Byte: The control byte is transmitted by the master and consists of the 7-bit slave address plus a

read/write (R/W?/SPAN>?/SPAN>) bit (see Figure 7). If the master is going to read data from the slave device then R/W?/SPAN>?/SPAN> =

1, and if the master is going to write data to the slave device then R/W?/SPAN>?/SPAN> = 0.

Pointer Byte: The pointer byte is used by the master to tell the DS75 which register is going to be

accessed during communication. The six LSbs of the pointer byte (see Figure 8) are always 0 and the two

LSbs correspond to the desired register as shown in Table 7.

Figure 6. START, STOP, AND ACK SIGNALS

Figure 7. ADDRESS BYTE

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

R/W?/SPAN>?/SPAN>

Figure 8. POINTER BYTE

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

SCL

SDA

START

Condition

STOP

Condition

ACK (or NACK)

From Receiver

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