ADT7516 datasheet(40/44 Pages) AD

40 / 44 page

ADT7516/ADT7517/ADT7519

Rev. B | Page 40 of 44

SCLK

DIN

STOP

CS (CONTINUED)

SCLK (CONTINUED)

DATA BYTE

WRITE COMMAND

DIN (CONTINUED)

START

Figure 63. SPI—Writing to the Address Pointer Register Followed by a Single Byte of Data to the Selected Register

Write Operation

Figure 63 shows the timing diagram for a write operation to the

ADT7516/ADT7517/ADT7519. 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 auto-incrementing to the next register in the register

map without having to load the address pointer register each

time. In Figure 63, the register address portion gives the first

sequential writable registers. Thus, after each data byte has been

written into a register, the address pointer register auto-

increments its value to the next available register. The address

pointer register auto-increments from 0x00 to 0x3F and loops

back to start again at 0x00 when it reaches 0x3F.

Read Operation

Figure 64 to Figure 66 show the timing diagrams necessary to

accomplish correct read operations. To read back from a

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

in Figure 64. Figure 65 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 66 shows the procedure when

reading data from two sequential registers. Multiple data reads

are possible in the SPI interface mode as the address pointer

increments from 0x00 to 0x3F and loops back to start again at

0x00 when it reaches 0x3F.

ADT7516 Datasheet(PDF) 40 Page - Analog Devices

ADT7516 Datasheet(HTML) 40 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Download

Link URL