ISL12022 INTERSIL [Intersil Corporation], ISL12022 Datasheet - Page 16

• Manufacturer Part Number: ISL12022
• Manufacturer: INTERSIL [Intersil Corporation]

Initial AT and DT setting Register (ITRO)
These bits are used to trim the initial error (at room
temperature) of the crystal. Both Digital Trimming (DT) and
Analog Trimming (AT) methods are available. The digital
trimming uses clock pulse skipping and insertion for
frequency adjustment. Analog 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”.
ADDR
0Bh
TABLE 9. BATTERY LEVEL MONITOR TRIP BITS
VB75Tp2
IDTR01
TABLE 11. INITIAL AT AND DT SETTING REGISTER
0
0
1
1
0
0
0
0
1
1
1
IDTR01 IDTR00 IATR05 IATR04 IATR03 IATR02 IATR01 IATR00
7
(VB75TP<2:0>)
TABLE 10. IDTR0 TRIMMING RANGE
6
VB75Tp1
IDTR00
0
1
0
1
0
0
1
1
0
0
1
5
16
Default/Disabled
+30.5ppm
0ppm
-30.5ppm
4
VB75Tp0
TRIMMING RANGE
0
1
0
1
0
1
0
3
2
ALARM TRIP
BATTERY
LEVEL
1.875
2.025
2.250
2.475
2.700
3.750
4.125
1
(V)
0
ISL12022
Aging adjustment is normally a few ppm and can be handled
by writing to the IATR section.
IATR05 IATR04 IATR03 IATR02 IATR01 IATR00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
TABLE 12. IATR0 TRIMMING RANGE
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
TRIMMING
June 23, 2009
RANGE
+32
+31
+30
+29
+28
+27
+26
+25
+24
+23
+22
+21
+20
+19
+18
+17
+16
+15
+14
+13
+12
+10
+11
-10
-11
-12
-13
-14
-15
-16
-17
FN6659.2
+9
+8
+7
+6
+5
+4
+3
+2
+1
-1
-2
-3
-4
-5
-6
-7
-8
-9
0