TMP122-EP

Multiple commands may be strung together as illustrated in Figure 2. The TMP122 accepts commands

alternating with 16-bit response data. On lowering CS, the part always responds with a READ from the address

location indicated by the READ address register. If the next command is a READ command then data is returned

from the address specified by the READ command with the 16th clock resetting the READ address register to

the default temperature register. The TMP122 then expects a 16-bit command. If the command is a WRITE

command, then the 16 clocks following the command will again return temperature data.

Figure 3, Figure 4, Figure 5, and Figure 6 detail the communication sequences.

Table 1. READ Command

READ Command

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Temperature

1

0

0

0

0

0

0

0

0

0

0

0

0

0

0

0

Configuration

1

0

0

0

0

0

0

0

0

0

0

0

1

0

0

0

register

Low temperature

1

0

0

0

0

0

0

0

0

0

0

1

0

0

0

0

threshold

High temperature

1

0

0

0

0

0

0

0

0

0

0

1

1

0

0

0

threshold

Table 2. WRITE Command

WRITE Command

D15

D14

D13

D12

D11

D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

Temperature

0

0

0

0

D1

D0

R1

R0

F1

F0

POL

TM1

TM0

0

1

0

Low temperature

T12

T11

T10

T9

T8

T7

T6

T5

T4

T3

T2

T1

T0

1

0

0

threshold

High temperature

T12

T11

T10

T9

T8

T7

T6

T5

T4

T3

T2

T1

T0

1

1

0

threshold

Shutdown command

x

x

x

x

x

x

x

x

1

1

1

1

1

1

1

1

Figure 4. READ followed by WRITE Command to Configuration Register

6

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