ADT7420 Analog Devices, ADT7420 Datasheet - Page 18

• Manufacturer Part Number: ADT7420
• Description: 16-Bit Digital I2C Temperature Sensor
• Manufacturer: Analog Devices

ADT7420
WRITING DATA
It is possible to write either a single byte of data or two bytes to
the ADT7420, depending on which registers are to be written.
Writing a single byte of data requires the serial bus address, the
data register address written to the address pointer register,
followed by the data byte written to the selected data register.
This is shown in Figure 14.
For the T
it is possible to write to both the MSB and the LSB registers in
SDA
SCL
SDA (CONTINUED)
SCL (CONTINUED)
START BY
MASTER
HIGH
SDA
SCL
START BY
MASTER
setpoint
1
1
, T
0
1
1
LOW
SERIAL BUS ADDRESS BYTE
D15
setpoint
1
0
0
SERIAL BUS ADDRESS BYTE
D14
FRAME 1
1
0
, and T
D13
0
FRAME 1
1
CRIT
Figure 14. Writing to a Register Followed by a Single Byte of Data
D12
Figure 15. Writing to a Register Followed by Two Bytes of Data
A1
SDA (CONTINUED)
SCL (CONTINUED)
0
setpoint
DATA BYTE
FRAME 3
D11
A0
A1
registers,
R/W
D10
A0
ADT7420
ACK. BY
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D9
R/W
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ADT7420
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D8
P7
1
ADT7420
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D7
9
1
P6
9
D6
P7
1
the same write transaction. Writing two bytes of data to these
registers requires the serial bus address, the data register address
of the MSB register written to the address pointer register,
followed by the two data bytes written to the selected data
register. This is shown in Figure 15.
If more than the required number of data bytes is written to a
register, the register ignores these extra data bytes. To write to
a different register, a start or repeated start is required.
ADDRESS POINTER REGISTER BYTE
D7
P5
1
P6
D5
ADDRESS POINTER REGISTER BYTE
D6
P4
P5
D4
FRAME 2
DATA BYTE
FRAME 3
P3
D5
P4
D3
FRAME 2
D4
P2
Preliminary Technical Data
D2
P3
DATA BYTE
FRAME 4
D3
P1
P2
D1
D2
P0
D0
P1
ADT7420
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ADT7420
ACK. BY
D1
9
P0
9
ADT7420
ACK. BY
D0
ADT7420
ACK. BY
9
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STOP BY
MASTER
9
STOP BY
MASTER