16 FN6682.3 December 6, 2011 AGING AND INITIAL TRIM DIGITAL TRIMMING BITS (IDTR0<1:0>) These bits allow ±30.5ppm initial trimmin" />
參數(shù)資料
型號: ISL12023IVZ-T
廠商: Intersil
文件頁數(shù): 8/29頁
文件大?。?/td> 0K
描述: IC RTC/CLDR TEMP SNSR 14-TSSOP
產(chǎn)品培訓模塊: Solutions for Industrial Control Applications
標準包裝: 2,500
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: 14-TSSOP(0.173",4.40mm 寬)
供應商設備封裝: 14-TSSOP
包裝: 帶卷 (TR)
ISL12023
16
FN6682.3
December 6, 2011
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 11. 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”.
Note that setting the IATR to the lowest settings (-31ppm) with
the default 32kHz output can cause the oscillator frequency to
become unstable on power-up. The lowest settings for IATR
should be avoided to insure oscillator frequency integrity.
TABLE 11. IDTR0 TRIMMING RANGE
IDTR01
IDTR00
TRIMMING RANGE
00
Default/Disabled
0
1
+30.5ppm
1
0
0ppm
1
-30.5ppm
TABLE 12. INITIAL AT AND DT SETTING REGISTER
ADDR
7
6
5
4
321
0
0Bh
IDTR0
1
IDTR0
0
IATR0
5
IATR0
4
IATR0
3
IATR0
2
IATR0
1
IATR00
TABLE 13. IATRO 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
00
1110
+18
00
1111
+17
01
0000
+16
01
0001
+15
01
0010
+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
110101
-21
110110
-22
110111
-23
111000
-24
111001
-25
111010
-26
111011
-27
111100
-28
111101
-29
111110
-30
111111
-31
TABLE 13. IATRO TRIMMING RANGE (Continued)
IATR05 IATR04 IATR03 IATR02 IATR01 IATR00
TRIMMING
RANGE
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