Datasheet

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SBOS273C − JUNE 2003 − REVISED FEBRUARY 2005
www.ti.com
6
0.25s
0.5s
50
µ
A(active)
20
µ
A(idle)
Figure 2. Conversion Time and Period
The serial data of the TMP121 and TMP123 consists of
12-bit plus sign temperature data followed by a
confirmation bit and two high impedance bits. Data is
transmitted in Binary Two’s Complement format. Figure 3
describes the output data of the TMP121 and TMP123.
Timing Diagrams
The TMP121 and TMP123 are SPI-compatible. Figure 4
and Figure 5 describe the various timing requirements,
with parameters defined in Table 3.
PARAMETER MIN MAX UNITS
SCK Period t
1
100 ns
SCK Falling Edge to Output Data Delay t
2
30 ns
CS to Rising Edge SCK Set-Up Time t
3
40 ns
CS to Output Data Delay t
4
30 ns
CS Rising Edge to Output High Impedance t
5
30 ns
Table 3. Timing Description
SO/I
SCK
CS
ZZ1D3D4D5D6D7D8D9D10D11D12D13D14D15Z
Figure 3. Data READ
SCK
CS
SO
t
1
t
3
t
2
t
4
Figure 4. Output Data Timing Diagram
SCK
CS
SO
t
5
t
5
SCK
CS
SO
Figure 5. High Impedance Output Timing Diagram