17 FN6659.3 November 22, 2011 trimming uses load capacitance adjustment to pull the oscillator frequency. A range of +62.5ppm to -61.5" />
參數(shù)資料
型號： ISL12022IBZ
廠商： Intersil
文件頁數(shù)： 9/29頁
文件大小： 0K
描述： IC RTC/CALENDAR TEMP SNSR 8-SOIC
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： 98
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： 8-SOIC（0.154"，3.90mm 寬）
供應商設備封裝： 8-SOIC
包裝： 管件
產(chǎn)品目錄頁面： 1245 (CN2011-ZH PDF)
ISL12022
17
FN6659.3
November 22, 2011
trimming uses load capacitance adjustment to pull the oscillator
frequency. A range of +62.5ppm to -61.5ppm is possible with
combined digital and analog trimming.
AGING AND INITIAL TRIM DIGITAL TRIMMING BITS
(IDTR0<1:0>)
These bits allow ±30.5ppm initial trimming range for the crystal
frequency. This is meant to be a coarse adjustment if the range
needed is outside that of the IATR control. See Table 10. The
IDTR0 register should only be changed while the TSE (Temp
Sense Enable) bit is “0”.
AGING AND INITIAL ANALOG TRIMMING BITS
(IATR0 <5:0>)
The 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 IATR0 register should only be changed while the
TSE (Temp Sense Enable) bit is “0”.
Aging adjustment is normally a few ppm and can be handled by
writing to the IATR section.
TABLE 10. IDTR0 TRIMMING RANGE
IDTR01
IDTR00
TRIMMING RANGE
00
Default/Disabled
0
1
+30.5ppm
1
0
0ppm
1
-30.5ppm
TABLE 11. INITIAL AT AND DT SETTING REGISTER
ADDR
7
6
5
4
321
0
0Bh
IDTR01 IDTR00 IATR05 IATR04 IATR03 IATR02 IATR01 IATR00
TABLE 12. IATR0 TRIMMING RANGE
IATR05 IATR04 IATR03 IATR02 IATR01 IATR00
TRIMMING
RANGE
00
0000
+32
00
0001
+31
00
0010
+30
00
0011
+29
00
0100
+28
00
0101
+27
00
0110
+26
00
0111
+25
00
1000
+24
00
1001
+23
00
1010
+22
00
1011
+21
00
1100
+20
00
1101
+19
001110
+18
001111
+17
010000
+16
010001
+15
010010
+14
010011
+13
010100
+12
010101
+11
010110
+10
010111
+9
011000
+8
011001
+7
011010
+6
011011
+5
011100
+4
011101
+3
011110
+2
011111
+1
100000
0
100001
-1
100010
-2
100011
-3
100100
-4
100101
-5
100110
-6
100111
-7
101000
-8
101001
-9
101010
-10
101011
-11
101100
-12
101101
-13
101110
-14
101111
-15
110000
-16
110001
-17
110010
-18
110011
-19
110100
-20
TABLE 12. IATR0 TRIMMING RANGE (Continued)
IATR05 IATR04 IATR03 IATR02 IATR01 IATR00
TRIMMING
RANGE
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