Datasheet
AD7416/AD7417/AD7418
Rev. I | Page 15 of 24
written to the selected data register. This is illustrated in
Figure 16.
• Writing two bytes of data to the T
OTI
setpoint or T
HYST
setpoint register.
If 9-bit resolution is required for the temperature setpoints,
two bytes of data must be written to the T
OTI
setpoint and
T
HYST
setpoint 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 17.
SCL
1 19 9
S
DA 1001
START BY
MASTER
ACK. BY
AD741x
1
ACK. BY
AD741x
1
STOP
BY
MASTER
FRAME 2
ADDRESS POINTER REGISTER BYTE
FRAME 1
SERIAL BUS ADDRESS BYTE
1
AD741x = AD7416/AD7417/AD7418.
A2 A1 P7 P6 P5 P4 P3 P2 P1 P0A0 R/W
01126-014
Figure 15. Writing to the Address Pointer Register to Select a Data Register for a Subsequent Read Operation
SCL
1 1
1
9
9
9
SDA 1 0 0 1
START BY
MASTER
ACK. BY
AD741x
1
ACK. BY
AD741x
1
ACK. BY
AD741x
1
STOP
BY
MASTER
FRAME 2
ADDRESS POINTER REGISTER BYTE
FRAME 3
DATA BYTE
FRAME 1
SERIAL BUS ADDRESS BYTE
SCL (CONTINUED)
SDA (CONTINUED)
A2 A1 P7 P6 P5 P4 P3 P2 P1 P0
D6D7 D5 D4 D3 D2 D1 D0
A0 R/W
01126-015
1
AD741x = AD7416/AD7417/AD7418.
Figure 16. Writing to the Address Pointer Register Followed by a Single Byte of Data to the Selected Data Register
SCL
SCL
(CONTINUED)
SDA
(CONTINUED)
119
119
9
SDA 1 0 0 1
START BY
MASTER
ACK. BY
AD741x
1
ACK. BY
AD741x
1
ACK. BY
AD741x
1
STOP BY
MASTER
ACK. BY
AD741x
1
STOP
BY
MASTER
FRAME 2
ADDRESS POINTER REGISTER BYTE
FRAME 1
SERIAL BUS ADDRESS BYTE
A2
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0
A1 P7 P6 P5 P4 P3 P2 P1 P0A0 R/W
9
FRAME 3
MOST SIGNIFICANT DATA BYTE
FRAME 4
LEAST SIGNIFICANT DATA BYTE
01126-016
1
AD741x = AD7416/AD7417/AD7418.
Figure 17. Writing to the Address Pointer Register Followed by Two Bytes of Data to the T
OTI
Setpoint or T
HYST
Setpoint Register