the Address Pointer Register, followed by the data byte writ-
ten to the selected data register. This is illustrated in Figure 9.
3. Writing two bytes of data to the TOTI or THYST Register.
If 9-bit resolution is required for the temperature setpoints,
two bytes of data must be written to the TOTI and THYST
registers. This consists of the serial bus address, the register
address written to the address pointer register, followed by
two data bytes written to the selected data register. This is
illustrated in Figure 10.
AD7416/AD7417/AD7418
READING DATA FROM THE AD7416/AD7417/AD7418
Reading data from the AD7416/AD7417/AD7418 is a one or
two byte operation. Reading back the contents of the Configura-
tion Register is a single byte read operation, as shown in Figure
11, the register address previously having been set by a single-
byte write operation to the Address Pointer Register.
Reading data from the temperature value, TOTI or THYST Regis-
ter, is a two-byte operation, as shown in Figure 12. It is also
possible to read the most significant bit of a 9-bit/10-bit register
in this manner.
1
9
1
9
SCL
SDA
1
START BY
MASTER
SCL
(CONTINUED)
0
0
1
A2 A1 A0 R/W
P7 P6 P5 P4 P3 P2 P1 P0
FRAME 1
SERIAL BUS ADDRESS BYTE
1
ACK. BY
AD7416
9
FRAME 2
ADDRESS POINTER REGISTER BYTE
1
ACK. BY
AD7416
9
SDA
(CONTINUED)
D15 D14 D13 D12 D11 D10 D9
FRAME 3
MOST SIGNIFICANT DATA BYTE
D8
D7 D6
ACK. BY STOP BY
AD7416 MASTER
D5 D4 D3 D2 D1
FRAME 4
LEAST SIGNIFICANT DATA BYTE
D0
ACK. BY STOP BY
AD7416 MASTER
Figure 10. Writing to the Address Pointer Register Followed by Two Bytes of Data to the TOTI or THYST Register
1
9
1
9
SCL
SDA
1
0
0
1 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
START BY
MASTER
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
AD7416
NO ACK. BY STOP BY
MASTER MASTER
FRAME 2
SINGLE DATA BYTE FROM AD7416
Figure 11. Reading a Single Byte of Data from the Configuration Register
1
9
1
9
SCL
SDA
1
START BY
MASTER
0
0
1
A2 A1 A0 R/W
D15 D14 D13 D12 D11 D10 D9 D8
FRAME 1
SERIAL BUS ADDRESS BYTE
ACK. BY
AD7416
ACK. BY
MASTER
FRAME 2
MOST SIGNIFICANT DATA BYTE FROM AD7416
1
9
SCL (CONTINUED)
SDA (CONTINUED)
D7 D6 D5 D4 D3 D2 D1 D0
NO ACK. BY
MASTER
FRAME 3
LEAST SIGNIFICANT DATA BYTE FROM AD7416
STOP BY
MASTER
Figure 12. Reading Two Bytes of Data from the TOTI or THYST Register
REV. G
–13–