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ISL12022
23
FN6659.3
November 22, 2011
NPPM is governed by Equation 5:
where:
T is the reading of the ADC, result is 2 x temperature in degrees
Kelvin.
Note that NPPM can also be predicted from the FATR and FDTR
register by the relationship (all values in decimal):
NPPM = 2*(BETA*FATR - (FDTR-16))
XT0 Registers (XT0)
TURNOVER TEMPERATURE (XT<3:0>)
The apex of the Alpha curve occurs at a point called the turnover
temperature, or XT0. Crystals normally have a turnover
temperature between +20°C and +30°C, with most occurring
near +25°C.
The ISL12022 allows setting the turnover temperature so that
temperature compensation can more exactly fit the curve of a
crystal. Table 24 shows the values available, with a range from
+17.5°C to +32.5°C in +0.5°C increments. The default value is
00000b or +25°C.
ALPHA Hot Register (ALPHAH)
The Alpha Hot variable is 7 bits and is defined as the temperature
coefficient of Crystal from the T0 value to +85°C. (both Alpha Hot
and Alpha Cold must be programmed to provide full temperature
compensation). It is normally given in units of ppm/°C2, with a
typical value of -0.034. Like the Alpha Cold version, a scaled
version of the absolute value of this coefficient is used in order to
get an integer value. Therefore, AlphaH<7:0> is defined as the
(|Actual AlphaH Value| x 2048) and converted to binary. For
example, a crystal with AlphaH of -0.034ppm/°C2 is first scaled
(|2048*(-0.034)| = 70d) and then converted to a binary number
of 0100110b.
The practical range of Actual AlphaH values is from
-0.020 to -0.060.
The ALPHAH register should only be changed while the TSE
(Temp Sense Enable) bit is “0”.
TABLE 23. TURNOVER TEMPERATURE
ADDR
7654321
0
2Ch
0
XT4XT3
XT2XT1
XT0
TABLE 24. XT0 VALUES
XT<4:0>
TURNOVER TEMPERATURE
01111
32.5
01110
32.0
01101
31.5
01100
31
01011
30.5
01010
30
01001
29.5
01000
29.0
00111
28.5
00110
28.0
00101
27.5
00100
27.0
00011
26.5
00010
26.0
NPPM
IPPM
ALPHA
T
T0
–
()
2
4096
----------------------------------------------------
+
=
(EQ. 5)
NPPM
IPPM
CPPM
+
=
NPPM
IPPM ITRO,BETA
() ALPHA
T-T0
()
2
×
+
=
ALPHA
α 2048
=
T2
298
() XT0
+
=
(EQ. 6)
or T
596
XT0
+
=
00001
25.5
00000
25.0
10000
25.0
10001
24.5
10010
24.0
10011
23.5
10100
23.0
10101
22.5
10110
22.0
10111
21.5
11000
21.0
11001
20.5
11010
20.0
11011
19.5
11100
19.0
11101
18.5
11110
18.0
11111
17.5
TABLE 25. ALPHAH REGISTER
ADDR
765
432
10
2Dh
D
ALP_H6 ALP_H5 ALP_H4 ALP_H3 ALP_H2 ALP_H1 ALP_H0
TABLE 24. XT0 VALUES (Continued)
XT<4:0>
TURNOVER TEMPERATURE
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