Figure 5. Two-wire Write Command Timing Diagram

Serial Bus Address

To communicate with the TMP112A, the master must first address slave devices through an address byte.

The address byte has seven address bits and a read-write (R/W) bit that indicates the intent of executing a

read or write operation. The TMP112A features an address pin to allow up to four devices to be addressed on a

single bus. Table 5 shows the connection mode of the ADD0 pins corresponding to each slave address.

Table 5. Address Pin and Slave Addresses

DEVICE TWO-WIRE ADDRESS

ADD0 PIN CONNECTION

1001000

GND

1001001

V+

1001010

SDA

1001011

SCL

6.2.3 Writing and Reading Operation

SCL

SDA

START by

Master

1

0

0

1

0

A1

A0

R/W

0

0

0

0

0

0

P1

P0

Frame 1 Two-Wire Slave Address Byte

Frame 2 Pointer Register Byte

1

9

1

9

SCL

(Continued)

D7

D6

D5

D4

D3

D2

D1

D7

D6

D5

D4

Frame 3 Data-Byte 1

Frame 4 Data-Byte 2

1

9

1

9

SDA

(Continued)

D0

D3

D2

D1

D0

STOP by

Master

SCL

SDA

START by

Master

1

0

0

1

0

A1

A0

R/W

0

0

0

0

0

0

P1

P0

Frame 1 Two-Wire Slave Address Byte

Frame 2 Pointer Register Byte

1

9

1

9

STOP By

Master

SCL

(Continued)

D7

D6

D5

D4

ACK by

Master

Frame 4 Data-Byte 1 Read Register

1

9

SDA

(Continued)

D3

D2

D1

D0

START by

Master

1

0

0

1

0

A1

A0

R/W

1

9

Frame 3 Two-Wire Slave Address Byte

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ACK by

ACK by

ACK by

ACK by

ACK by

ACK by

From

ACK by

UMW

R

TMP112A