AD7417 AD [Analog Devices], AD7417 Datasheet - Page 13

• Manufacturer Part Number: AD7417
• Description: 10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418)
• Manufacturer: AD [Analog Devices]

3. Writing two bytes of data to the T
REV. G
the Address Pointer Register, followed by the data byte writ-
ten to the selected data register. This is illustrated in Figure 9.
If 9-bit resolution is required for the temperature setpoints,
two bytes of data must be written to the T
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.
Figure 10. Writing to the Address Pointer Register Followed by Two Bytes of Data to the T
(CONTINUED)
(CONTINUED)
SDA
SCL
START BY
MASTER
SCL
SDA
SDA
SCL
SDA
SCL
START BY
MASTER
START BY
MASTER
1
1
D15
1
1
1
1
1
0
Figure 11. Reading a Single Byte of Data from the Configuration Register
D14
SERIAL BUS ADDRESS BYTE
0
0
Figure 12. Reading Two Bytes of Data from the T
0
SERIAL BUS ADDRESS BYTE
SERIAL BUS ADDRESS BYTE
D13
0
MOST SIGNIFICANT DATA BYTE
0
1
FRAME 1
OTI
1
D12
FRAME 1
1
A2
FRAME 1
or T
FRAME 3
A2
D11
A2
A1
SDA (CONTINUED)
HYST
SCL (CONTINUED)
OTI
A1
D10
A1
Register.
A0
and T
A0
D9
R/W
A0
R/W
HYST
ACK. BY
AD7416
ACK. BY
AD7416
D8
R/W
9
ACK. BY
AD7416
9
ACK. BY
AD7416
–13–
D7
9
9
1
P7
1
D7
1
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, T
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.
STOP BY
MASTER
D7
D15
LEAST SIGNIFICANT DATA BYTE FROM AD7416
1
D6
1
P6
D6
ADDRESS POINTER REGISTER BYTE
D6
D14
SINGLE DATA BYTE FROM AD7416
D5
MOST SIGNIFICANT DATA BYTE FROM AD7416
P5
D5
LEAST SIGNIFICANT DATA BYTE
D5
D13
D4
P4
D4
OTI
FRAME 3
FRAME 2
or T
FRAME 2
D12
D4
D3
D3
P3
AD7416/AD7417/AD7418
FRAME 4
HYST
FRAME 2
D3
D11
D2
D2
P2
Register
D2
D10
D1
D1
P1
D1
NO ACK. BY
D0
D0
D9
P0
NO ACK. BY
MASTER
MASTER
OTI
ACK. BY
AD7416
D0
or T
9
D8
9
9
ACK. BY
ACK. BY
MASTER
AD7416
OTI
HYST
STOP BY
MASTER
9
STOP BY
MASTER
9
or T
Register
STOP BY
MASTER
HYST
Regis-