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ISL12020M
19
FN6667.5
December 13, 2011
adjustment for trimming initial crystal accuracy error or to
correct for aging drift.
The ISL12020M has a preset Initial Analog Trimming value
corresponding to the crystal in the module. This value is recalled
on initial power-up and should never be changed for best
temperature compensation performance, although the user may
change this preset value to adjust for aging or board mounting
changes if so desired.
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 12. INITIAL AT AND DT SETTING REGISTER
ADDR
7
6
5
4
3
2
1
0
0Bh
IDTR0
1
IDTR0
0
IATR0
5
IATR0
4
IATR0
3
IATR0
2
IATR0
1
IATR0
0
TABLE 13. IATRO TRIMMING RANGE
IATR05
IATR04
IATR03
IATR02
IATR01
IATR00
TRIMMING RANGE
00
0
+32
00
0
1
+31
00
0
1
0
+30
00
0
1
+29
00
0
1
0
+28
00
0
1
0
1
+27
00
0
1
0
+26
00
0
1
+25
00
1
0
+24
00
1
0
1
+23
00
1
0
1
0
+22
00
1
0
1
+21
00
1
0
+20
00
1
0
1
+19
00
1
0
+18
00
1
+17
01
0
+16
01
0
1
+15
01
0
1
0
+14
01
0
1
+13
01
0
1
0
+12
01
0
1
0
1
+11
01
0
1
0
+10
01
0
1
+9
01
1
0
+8
01
1
0
1
+7
01
1
0
1
0
+6
01
1
0
1
+5
01
1
0
+4
01
1
0
1
+3
01
1
0
+2
01
1
+1
10
0
0
10
0
1
-1
10
0
1
0
-2
10
0
1
-3
10
0
1
0
-4
10
0
1
0
1
-5
10
0
1
0
-6
10
0
1
-7
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