TMP451
SBOS686 –JUNE 2013
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Conversion Rate Register
The conversion rate register (read address 04h, write address 0Ah) controls the rate at which temperature
conversions are performed. This register adjusts the idle time between conversions but not the conversion time
itself, thereby allowing the TMP451 power dissipation to be balanced with the temperature register update rate.
Table 6 describes the conversion rate options and corresponding time between conversions. The default value of
the register is 08h, which gives a default rate of 16 conversions per second.
Table 6. Conversion Rate Register
CONVERSION RATE REGISTER (READ = 04h, WRITE = 0Ah, POR = 08h)
VALUE
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
CONVERSIONS PER SECOND
TIME (SECONDS)
0.0625
16
0.125
8
0.25
4
0.5
2
1
1
0.5
2
4
0.25
8
16 (default)
32
0.125
0.0625 (default)
0.03125
One-Shot Start Register
When the TMP451 is in shutdown mode (SD = '1' in the configuration register), a single conversion is started by
writing any value to the one-shot start register, pointer address 0Fh. This write operation starts one conversion
and comparison cycle on both the local and the remote sensors. The TMP41 returns to shutdown mode when
the cycle completes. The value of the data sent in the write command is irrelevant and is not stored by the
TMP451.
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