Datasheet

ADT7410 Data Sheet
Rev. A | Page 18 of 24
WRITING DATA
It is possible to write either a single byte of data or two bytes to
the ADT7410, 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 15.
For the T
HIGH
setpoint, T
LOW
setpoint, and T
CRIT
setpoint registers,
it is possible to write to both the MSB and the LSB registers in
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 16.
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.
Figure 15. Writing to a Register Followed by a Single Byte of Data
Figure 16. Writing to a Register Followed by Two Bytes of Data
FRAME 1
SERIA
L BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
ACK. BY
ADT7410
ACK. BY
ADT7410
ACK. BY
ADT7410
STOP BY
MASTER
FRAME 3
DATA BYTE
SDA (CONTINUED)
SCL (CONTINUED)
SCL
SDA
START BY
MASTER
1 0 0 1 0 A1 A0 P7 P6 P5 P4 P3 P2 P1 P0
9
D7 D6 D5 D4 D3 D2 D1 D0
R/W
191
91
06560-016
FRAME 1
SERIAL BUS ADDRESS BYTE
FRAME 2
ADDRESS POINTER REGISTER BYTE
ACK. BY
ADT7410
ACK. BY
ADT7410
ACK. BY
ADT7410
STOP BY
MASTER
FRAME 4
DATA BYTE
SCL
SDA
START BY
MASTER
1 0 0 1 0 A1 A0 P7 P6 P5 P4 P3 P2 P1 P0
9
D7 D6 D5 D4 D3 D2 D1 D0
R/W
191
91
ACK. BY
ADT7410
FRAME 3
DATA BYTE
SDA (CONTINUED)
SCL (CONTINUED)
D15 D14 D13 D12 D11 D10 D9 D8
91
06560-017