19 FN7575.5 September 5, 2012 AGING AND INITIAL ANALOG TRIMMING BITS (IATR0<5:0>) The Initial Analog Trimming Register allows " />
參數(shù)資料
型號： ISL12022MAIBZ
廠商： Intersil
文件頁數(shù)： 11/31頁
文件大?。?/td> 0K
描述： IC RTC/CALENDAR TEMP SNSR 20SOIC
產(chǎn)品培訓(xùn)模塊： Solutions for Industrial Control Applications
標(biāo)準(zhǔn)包裝： 38
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(yīng)商設(shè)備封裝： 20-SOIC
包裝： 管件
ISL12022MA
19
FN7575.5
September 5, 2012
AGING AND INITIAL ANALOG TRIMMING BITS
(IATR0<5:0>)
The Initial Analog Trimming Register allows +32ppm to -31ppm
adjustment in 1ppm/bit increments. This enables fine frequency
adjustment for trimming initial crystal accuracy error or to
correct for aging drift.
The ISL12022MA has a preset Initial Analog Trimming value
corresponding to the crystal in the module. This value is recalled on
initial power-up, is preset in device production and is READ-ONLY. It
cannot be overwritten by the user.
ALPHA Register (ALPHA)
The ALPHA variable is 8 bits and is defined as the temperature
coefficient of crystal from -40°C to T0, or the ALPHA Cold (there is
an Alpha Hot register that must be programmed as well). It is
normally given in units of ppm/°C2, with a typical value of -0.034.
The ISL12022MA device uses a scaled version of the absolute
value of this coefficient in order to get an integer value. Therefore,
ALPHA <7:0> is defined as the (|Actual ALPHA Value| x 2048) and
converted to binary. For example, a crystal with Alpha 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 ALPHA values is from -0.020 to -0.060.
The ISL12022MA has a preset ALPHA 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 12. INITIAL AT AND DT SETTING REGISTER
ADDR
7
6
5
4
3
2
1
0
0Bh
IDTR01 IDTR00 IATR0
5
IATR0
4
IATR03 IATR0
2
IATR0
1
IATR0
0
TABLE 13. IATRO TRIMMING RANGE
IATR05
IATR04
IATR03
IATR02
IATR01
IATR00
TRIMMING
RANGE
0000
00
+32
0000
01
+31
0000
10
+30
0000
11
+29
0001
00
+28
0001
01
+27
0001
10
+26
0001
11
+25
0010
00
+24
0010
01
+23
0010
10
+22
0010
11
+21
0011
00
+20
0011
01
+19
0011
10
+18
0011
11
+17
0100
00
+16
0100
01
+15
0100
10
+14
0100
11
+13
0101
00
+12
0101
01
+11
0101
10
+10
0101
11
+9
0110
00
+8
0110
01
+7
0110
10
+6
0110
11
+5
0111
00
+4
0111
01
+3
0111
10
+2
0111
11
+1
1000
00
0
1000
01
-1
1000
10
-2
1000
11
-3
1001
00
-4
100
101
-5
100
110
-6
100
111
-7
101
000
-8
101
001
-9
101
010
-10
101
011
-11
101
100
-12
101
-13
101
110
-14
101
111
-15
110
000
-16
110
001
-17
110
010
-18
110
011
-19
110
100
-20
110
101
-21
110
-22
110
111
-23
111
000
-24
111
001
-25
111
010
-26
111
011
-27
111
100
-28
111
101
-29
111
110
-30
111
-31
TABLE 14. ALPHA REGISTER
ADDR 7
6543210
0Ch
D ALPHA
6
ALPHA
5
ALPHA
4
ALPHA
3
ALPHA
2
ALPHA
1
ALPHA
0
TABLE 13. IATRO TRIMMING RANGE (Continued)
IATR05
IATR04
IATR03
IATR02
IATR01
IATR00
TRIMMING
RANGE
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