Datasheet

Clock operation M41T93
28/56 DocID12615 Rev 8
Figure 12. Clock accuracy vs. on-chip load capacitors
ai13906
DECREASING LOAD CAP.
-20.0
0.0
20.0
40.0
60.0
80.0
100.0
-5.0-18.0 -15.0 -10.0 0.0 5.0 9.75
Analog Calibration
Value, AC,
register 0x12
PPM ADJUSTMENT
OFFSET TO
C
XI
, C
XO
(pF)
NET EQUIV. LOAD
CAP., C
LOAD
, (pF)
103.5 5.0 7.5 12.5 15 17.4
0xC8 0xBC 0xA8 0x94 0x00 0x14 0x27
INCREASING LOAD CAP.
SLOWER
FASTER
XOXI
Crystal
Oscillator
C
XO
C
XI
C
LOAD
=
C
XI
+ C
XO
C
XI
*
C
XO
On-Chip