Datasheet

TMP411-Q1
SBOS527F –DECEMBER 2010–REVISED NOVEMBER 2013 www.ti.com
SOFTWARE RESET CONSECUTIVE ALERT REGISTER
The TMP411-Q1 may be reset by writing any value to The value in the Consecutive Alert Register (address
Pointer Register FCh. This restores the power-on- 22h) determines how many consecutive out-of-limit
reset state to all of the TMP411-Q1 registers as well measurements must occur on a measurement
as aborting any conversion in process and clearing channel before the ALERT signal is activated. The
the ALERT and THERM pins. value in this register does not affect bits in the Status
Register. Values of one, two, three, or four
The TMP411-Q1 also supports reset via the two-wire
consecutive conversions can be selected; one
general call address (00000000). The TMP411-Q1
conversion is the default. This function allows
acknowledges the general call address and responds
additional filtering for the ALERT pin. The consecutive
to the second byte. If the second byte is 00000110,
alert bits are shown in Table 10.
the TMP411-Q1 executes a software reset. The
TMP411-Q1 takes no action in response to other
values in the second byte.
Table 10. Consecutive Alert Register
CONSECUTIVE ALERT REGISTER (READ = 22h, WRITE = 22h, POR = 01h) NUMBER OF CONSECUTIVE
OUT-OF-LIMIT
C2 C1 C0
MEASUREMENTS
0 0 0 1
0 0 1 2
0 1 1 3
1 1 1 4
NOTE
Bit 7 of the Consecutive Alert Register controls the enable/disable of the timeout function.
See the Timeout Function section for a description of this feature.
THERM HYSTERESIS REGISTER
The THERM Hysteresis Register, shown in Table 12, stores the hysteresis value used for the THERM pin alarm
function. This register must be programmed with a value that is less than the Local Temperature High Limit
Register value, Remote Temperature High Limit Register value, Local THERM Limit Register value, or Remote
THERM Limit Register value; otherwise, the respective temperature comparator does not trip on the measured
temperature falling edges. Allowable hysteresis values are shown in Table 11. The default hysteresis value is
10°C, whether the device is operating in the standard or extended mode setting.
Table 11. Allowable THERM Hysteresis Val
THERM HYSTERESIS VALUE
TEMPERATURE
TH[11:4]
(°C)
(HEX)
(STANDARD BINARY)
0 0000 0000 00
1 0000 0001 01
5 0000 0101 05
10 0000 1010 0A
25 0001 1001 19
50 0011 0010 32
75 0100 1011 4B
100 0110 0100 64
125 0111 1101 7D
127 0111 1111 7F
150 1001 0110 96
175 1010 1111 AF
200 1100 1000 C8
225 1110 0001 E1
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