TMP421_15 Datasheet, PDF (21/35 Pages) Texas Instruments – ±1°C Remote and Local TEMPERATURE SENSOR

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TMP421
TMP422
TMP423
SBOS398C – JULY 2007 – REVISED MAY 2012
1
SCL
91
9
¼
SDA
1 0 0 1 1 0 0⁽¹⁾ R/W
P7 P6 P5 P4 P3 P2 P1 P0
¼
Start By
Master
ACK By
TMP421/22/23
ACK By
TMP421/22/23
Frame 1 Two-Wire Slave Address Byte
Frame 2 Pointer Register Byte
1
9
SCL
(Continued)
SDA
(Continued)
D7 D6 D5 D4 D3 D2 D1 D0
ACK By Stop By
TMP421/22/23 Master
Frame 3 Data Byte 1
(1) Slave address 1001100 shown.
Figure 17. Two-Wire Timing Diagram for Write Word Format
1
SCL
91
9
¼
SDA
1
Start By
Master
0
0
1
1
0 0⁽¹⁾ R/W
P7 P6 P5 P4 P3 P2 P1 P0
¼
ACK By
TMP421/22/23
Frame 1 Two-Wire Slave Address Byte
ACK By
TMP421/22/23
Frame 2 Pointer Register Byte
1
SCL
(Continued)
91
9
¼
SDA
(Continued)
1
Start By
Master
0
0
1
1
0 0⁽¹⁾ R/W
D7 D6 D5 D4 D3 D2 D1 D0
ACK By
TMP421/22/23
Frame 3 Two-Wire Slave Address Byte
From
TMP421/22/23
Frame 4 Data Byte 1 Read Register
¼
NACK By
Master⁽²⁾
(1) Slave address 1001100 shown.
(2) Master should leave SDA high to terminate a single-byte read operation.
Figure 18. Two-Wire Timing Diagram for Single-Byte Read Format
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