Datasheet

TMP431
TMP432
SBOS441F –SEPTEMBER 2009–REVISED AUGUST 2013 www.ti.com
Configuration Register 2
The REN bit enables external temperature
measurement channel 1 (connected to pins 2 and 3.)
Configuration Register 2 (pointer address 1Ah for the
If REN = '1', the external channel is enabled; if REN =
TMP431 and 3Fh for the TMP432) controls which
'0', the external channel is disabled.
temperature measurement channels are enabled and
whether the external channels have the resistance
For the TMP432 only, the REN2 bit enables the
correction feature enabled or not.
second external measurement channel (connected to
pins 4 and 5). If REN2 = '1', the second external
The RC bit enables the resistance correction feature
channel is enabled; if REN2 = '0', the second external
for the external temperature channels. If RC = '1',
channel is disabled.
series resistance correction is enabled; if RC = '0',
resistance correction is disabled. Resistance
The temperature measurement sequence is local
correction should be enabled for most applications.
channel, external channel 1, external channel 2,
However, disabling the resistance correction may
shutdown, and delay (to set conversion rate, if
yield slightly improved temperature measurement
necessary). The sequence starts over with the local
noise performance, and reduce conversion time by
channel. If any of the channels are disabled, they are
about 50%, which could lower power consumption
skipped in the sequence. Table 8 summarizes the
when conversion rates of two per second or less are
bits of Configuration Register 2.
selected.
The LEN bit enables the local temperature
measurement channel. If LEN = '1', the local channel
is enabled; if LEN = '0', the local channel is disabled.
Table 8. Configuration Register 2 Bit Descriptions
CONFIGURATION REGISTER 2
(Read/Write = 1A for TMP431 3F for TMP432; POR = 1Ch for TMP431; 3Ch for TMP432)
BIT NAME FUNCTION POWER-ON RESET VALUE
7, 6 Reserved — 0
0 = External channel 2 disabled 1 (TMP432)
5 REN2
1 = External channel 2 enabled 0 (TMP431)
0 = External channel 1 disabled
4 REN 1
1 = External channel 1 enabled
0 = Local channel disabled
3 LEN 1
1 = Local channel enabled
0 = Resistance correction
disabled
2 RC 1
1 = Resistance correction
enabled
1, 0 Reserved — 0
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