W83782D Datasheet, PDF (17/73 Pages) Winbond – MONITORING IC

Preliminary W83782D
6.2.4 The serial bus timing of the temperature 2 and 3 is shown as follow:
(a) Typical 2-byte read from preset pointer location (Temp, T_OS, T_HYST)
0
SCL
SDA
0
Start By
Master
7 8 0 _...
7 8 0 _...
7
1 0 1 1 0 1 R/W
D7 ... D1 D0
D7 ... D1 D0
Frame 1
Serial Bus Address Byte
Ack
Ack
by
Frame 2
by
Master
782D
MSB Data Byte
Frame 3
LSB Data Byte
Ack
by
Master
Stop by
Master
Figure 5. Typical 2-Byte Read From Preset Pointer Location
(b) Typical pointer set followed by immediate read for 2-byte register (Temp, T_OS, T_HYST)
0
SCL
780
4
SDA
1 0 0 1 A2 A1 A0 R/W
0 0 0 0 0 0 D1 D0
Start By
Master
Frame 1
Ack
Ack
by
Frame 2
by
Serial Bus Address Byte
782D
Pointer Byte
782D
0
SCL
SDA
1
Start By
Master
78
0 0 1 A2 A1
Frame 3
Serial Bus Address Byte
A0 R/W
Ack
by
782D
0
0
...
78
D7 ...
D1 D0
Frame 4
MSB Data Byte
Ack
by
Master
0
7
...
D7 ...
D1 D0
Frame 5
LSB Data Byte
No Ack
by
Master
Stop by
Master
Figure 6. Typical Pointer Set Followed by Immediate Read for 2-Byte Register
(c) Typical read 1-byte from configuration register with preset pointer
0
SCL
780
78
SDA
1
Start By
Master
0 0 1 A2 A1 A0 R/W
D7 D6 D5 D4 D3 D2 D1 D0
Frame 1
Serial Bus Address Byte
Ack
by
Frame 2
782D
Data Byte
No Ack
by
Master
Stop by
Master
Figure 7. Typical 1-Byte Read From Configuration With Preset Pointer
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Publication Release Date: April 1999
Revision A1