ADT7317ARQZ-REEL71 查看數據表（PDF） - Analog Devices

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ADT7317ARQZ-REEL71

±0.5°C Accurate Digital Temperature Sensor and Quad Voltage Output 12-/10-/8-Bit DACs

Analog Devices 

ADT7316/ADT7317/ADT7318

CS

1

8

1

8

SCLK

DIN

D7 D6 D5 D4 D3 D2 D1 D0

X

X

X

X

X

X

X

DOUT

X

X

X

X

X

X

X

X

D7 D6 D5 D4 D3 D2 D1

START

READ COMMAND

DATA BYTE 1

Figure 56. SPI —Reading a Single Byte of Data From a Selected Register

X

D0

STOP

CS

1

8

1

8

SCLK

DIN

D7 D6 D5 D4 D3 D2 D1 D0 X

X

X

X

X

X

X

X

DOUT

X

X

X

X

X

X

START

READ COMMAND

X X D7 D6 D5 D4 D3 D2 D1 D0

DATA BYTE 1

CS (CONTINUED)

1

8

SCLK (CONTINUED)

DIN (CONTINUED)

X

X

X

X

X

X

X

X

DOUT (CONTINUED)

D7 D6 D5 D4 D3 D2 D1

DATA BYTE 2

Figure 57. SPI—Reading Two Bytes of Data From Two Sequential Registers

D0

STOP

CS

SPI

READ OPERATION

WRITE OPERATION

Figure 58. SPI—Correct Use of CS During SPI Communication

Read Operation

Figure 56 and Figure 57 show the timing diagrams necessary

to accomplish correct read operations. To read back from a

register, first write to the address pointer register with the

address of the register to read from, as shown in Figure 53.

Figure 56 shows the procedure for reading back a single byte

of data. The read command is first sent to the part during the

first eight clock cycles. As the read command is being sent,

irrelevant data is output onto the DOUT line. During the

following eight clock cycles, the data contained in the register

selected by the address pointer register is output onto the

DOUT line. Data is output onto the DOUT line on the falling

edge of SCLK. Figure 57 shows the procedure when reading

data from two sequential registers. Multiple data reads are

possible in SPI interface mode as the address pointer register is

auto-incremental. The address pointer register auto-increments

from Address 0x00 to Address 0x3F and loops back to start all

over again at Address 0x00 when it reaches Address 0x3F.

Rev. B | Page 39 of 44

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