Datasheet
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SBOS371A − AUGUST 2006 − REVISED OCTOBER 2007
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14
CONSECUTIVE ALERT REGISTER
The value in the Consecutive Alert Register (address 22h)
determines how many consecutive out-of-limit
measurements must occur on a measurement channel
before the ALERT
signal is activated. The value in this
register does not affect bits in the Status Register. Values
of one, two, three, or four consecutive conversions can be
selected; one conversion is the default. This function
allows additional filtering for the ALERT
pin. The
consecutive alert bits are shown in Table 8.
Table 8. Consecutive Alert Register
CONSECUTIVE ALERT REGISTER
C2 C1 C0
NUMBER OF CONSECUTIVE
OUT-OF-LIMIT 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 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
will not trip on the measured temperature falling edges.
Allowable hysteresis values are shown in Table 9. The
default hysteresis value is 10°C, whether the device is
operating in the standard or extended mode setting.
Table 9. Allowable THERM Hysteresis Values
THERM HYSTERESIS VALUE
TEMPERATURE
(5C)
TH[11:4]
(STANDARD BINARY)
(HEX)
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
255 1111 1111 FF
Table 10. THERM Hysteresis Register Format
THERM HYSTERESIS REGISTER (Read = 21h, Write = 21h)
BIT # D7 D6 D5 D4 D3 D2 D1 D0
BIT NAME TH11 TH10 TH9 TH8 TH7 TH6 TH5 TH4
POR VALUE 0 0 0 0 1 0 1 0