Datasheet

TMP431
TMP432
www.ti.com SBOS441F –SEPTEMBER 2009–REVISED AUGUST 2013
Configuration Register 1
The AL/TH bit (bit 5) controls whether the ALERT pin
functions in ALERT mode or THERM2 mode. If
The Configuration Register 1 sets the temperature
AL/TH = 0, the ALERT pin operates as an interrupt
range, controls shutdown mode, and determines how
pin. In this mode, the ALERT pin goes low after the
the ALERT/THERM2 pin functions. The Configuration
set number of consecutive out-of-limit temperature
Register is set by writing to pointer address 09h and
measurements occur.
read by reading from pointer address 03h.
If AL/TH = 1, the ALERT/THERM2 pin implements a
The MASK bit (bit 7) enables or disables the ALERT
THERM function (THERM2). In this mode, THERM2
pin output if ALERT/THERM = 0. If ALERT/THERM =
functions similar to the THERM pin except that the
1 then the MASK bit has no effect. If MASK is set to
local high limit and remote high limit registers are
‘0’, the ALERT pin goes low when one of the
used for the thresholds. THERM2 goes low when
temperature measurement channels exceeds its high
either RHIGH or LHIGH is set.
or low limits for the chosen number of consecutive
conversions. If the MASK bit is set to ‘1’, the
The temperature range is set by configuring bit 2 of
TMP431/32 retain the ALERT pin status, but the
the Configuration Register 1. Setting this bit low
ALERT pin does not go low.
configures the TMP431/32 for the standard
measurement range (0°C to +127°C); temperature
The shutdown (SD) bit (bit 6) enables or disables the
conversions will be stored in the standard binary
temperature measurement circuitry. lf SD = 0, the
format. Setting bit 2 high configures the TMP431/32
TMP431/32 convert continuously at the rate set in the
for the extended measurement range (–55°C to
conversion rate register. When SD is set to '1', the
+150°C); temperature conversions are stored in the
TMP431/32 immediately stop converting and enter a
extended binary format (see Table 1).
shutdown mode. When SD is set to '0' again, the
TMP431/32 resume continuous conversions. A single
The remaining bits of the Configuration Register 1 are
conversion can be started when SD = 1 by writing to
reserved and must always be set to ‘0’. The power-on
the One-Shot Register.
reset value for this register is 00h. Table 7
summarizes the bits of the Configuration Register 1.
Table 7. Configuration Register 1 Bit Descriptions
CONFIGURATION REGISTER 1
(Read = 03h, Write = 09h, POR = 00h)
BIT NAME FUNCTION POWER-ON RESET VALUE
0 = ALERT Enabled
7 MASK 0
1 = ALERT Masked
0 = Run
6 SD 0
1 = Shut Down
0 = ALERT Mode
5 AL/TH 0
1 = THERM Mode
4, 3 Reserved — 0
0 = 0°C to +127°C
2 Temperature Range 0
1 = −55°C to +150°C
1, 0 Reserved — 0
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