ADT7518ARQZ【PDF 36/40 页】IC SENSOR TEMP QD ADC/DAC 16QSOP

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Sheet目录39

32页 33页 34页 35页 [36页]37页 38页 39页 40页

ADT7518

Rev. A | Page 36 of 40

R/W

SCL

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

ADT7518

ACK. BY

ADT7518

STOP BY

MASTER

START BY

MASTER

Figure 56. I

CWriting to the Address Pointer Register to Select a Register for a Subsequent Read Operation

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

ADDRESS POINTER REGISTER BYTE

ACK. BY

ADT7518

ACK. BY

ADT7518

STOP BY

MASTER

FRAME 3

DATA BYTE

SDA (CONTINUED)

SCL (CONTINUED)

SCL

START BY

MASTER

R/W

ACK. BY

ADT7518

Figure 57. I

CWriting to the Address Pointer Register Followed by a Single Byte of Data to the Selected Register

SDA

START BY

MASTER

STOP BY

MASTER

NO ACK. BY

MASTER

ACK. BY

ADT7518

SCL

A0 R/W

FRAME 1

SERIAL BUS ADDRESS BYTE

FRAME 2

SINGLE DATA BYTE FROM ADT7518

Figure 58. I

CReading a Single Byte of Data from a Selected Register

Write Operation

Figure 59 shows the timing diagram for a write operation to the

ADT7518. Data is clocked into the registers on the rising edge

of SCLK. When the CS

line is high, the DIN and DOUT lines

are in three-state mode. Only when the CS

goes from a high to a

low does the part accept any data on the DIN line. In SPI mode,

the address pointer register is capable of autoincrementing to

the next register in the register map without having to load the

address pointer register each time. In Figure 59, the register

address portion gives the first register that will be written to.

Subsequent data bytes will be written into sequential writable

registers. Thus, after each data byte has been written into a

the next available register. The address pointer register will

autoincrement from 00h to 3Fh and will loop back to start again

at 00h when it reaches 3Fh.

Read Operation

Figure 60 to Figure 62 show the timing diagrams necessary to

accomplish correct read operations. To read back from a reg-

ister, first write to the address pointer register with the address

of the register to be read from. This operation is shown in

Figure 60. Figure 61 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. 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 62

shows the procedure when reading data from two sequential

registers. Multiple data reads are possible in the SPI interface

mode as the address pointer register is autoincremental. The

address pointer register will autoincrement from 00h to 3Fh and

will loop back to start again at 00h when it reaches 3Fh.

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