23 FN6668.9 June 20, 2012 NPPM is governed by Equations 4 and 5: where T is the reading of the ADC, result is 2 x temperature in degr" />
參數(shù)資料
型號： ISL12022MIBZ
廠商： Intersil
文件頁數(shù)： 16/31頁
文件大?。?/td> 0K
描述： IC RTC/CALENDAR TEMP SNSR 20SOIC
應用說明： Addressing Power Issues in Real Time Clock Appls
產(chǎn)品培訓模塊： Solutions for Industrial Control Applications
標準包裝： 760
類型： 時鐘/日歷
特點： 警報器，夏令時，閏年，SRAM
存儲容量： 128B
時間格式： HH:MM:SS（12/24 小時）
數(shù)據(jù)格式： YY-MM-DD-dd
接口： I²C，2 線串口
電源電壓： 2.7 V ~ 5.5 V
電壓 - 電源，電池： 1.8 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 20-SOIC（0.295"，7.50mm 寬）
供應商設備封裝： 20-SOIC W
包裝： 管件
ISL12022M
23
FN6668.9
June 20, 2012
NPPM is governed by Equations 4 and 5:
where
T is the reading of the ADC, result is 2 x temperature in degrees
Kelvin.
or
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 ISL12022M has a preset Turnover temperature
corresponding to the crystal in the module. This value is recalled
on initial power-up and is preset in device production. It is READ
ONLY and cannot be overwritten by the user.
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 XT0 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, ALP_H <7:0> is defined as the
(|Actual Alpha Hot Value| x 2048) and converted to binary. For
example, a crystal with Alpha Hot of -0.034ppm/°C2 is first scaled
(|2048*(-0.034)| = 70d) and then converted to a binary number
of 01000110b.
The practical range of Actual ALPHAH values is from -0.020 to
-0.060.
The ISL12022M has a preset ALPHAH value corresponding to the
crystal in the module. This value is recalled on initial power-up
and is preset in device production. It is READ ONLY and cannot
be overwritten by the user.
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
NPPM
IPPM
ALPHA
T
T0
–
()
2
4096
----------------------------------------------------
+
=
(EQ. 4)
NPPM
IPPM
CPPM
+
=
NPPM
IPPM ITRO,BETA
() ALPHA
T-T0
()
2
×
+
=
ALPHA
α 2048
=
T2
298
() XT0
+
=
(EQ. 5)
T
596
XT0
+
=
00010
26.0
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 7
6
5
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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