m41t83 STMicroelectronics, m41t83 Datasheet - Page 33

• Manufacturer Part Number: m41t83
• Description: Serial I 2c Bus Rtc With Battery Switchover
• Manufacturer: STMicroelectronics

Figure 18. Clock accuracy vs. on-chip load capacitance
Analog Calibration
Analog Calibration
NET EQUIV. LOAD
NET EQUIV. LOAD
CAP., C
CAP., C
register 0x12
register 0x12
C
C
OFFSET TO
OFFSET TO
100.0
100.0
-20.0
-20.0
XI
XI
Value, AC,
Value, AC,
80.0
80.0
60.0
60.0
40.0
40.0
20.0
20.0
LOAD
LOAD
, C
, C
0.0
0.0
XO
XO
, (pF)
, (pF)
(pF)
(pF)
SLOWER
SLOWER
FASTER
FASTER
-18.0 -15.0
-18.0 -15.0
0xC8 0xBC
0xC8 0xBC
3.5
3.5
5.0
5.0
DECREASING LOAD CAP.
DECREASING LOAD CAP.
-10.0
-10.0
0xA8
0xA8
7.5
7.5
0x94
0x94
-5.0
-5.0
10
10
On-Chip
On-Chip
C
C
XI
XI
XI
XI
0x00
0x00
12.5
12.5
0.0
0.0
INCREASING LOAD CAP.
INCREASING LOAD CAP.
Oscillator
Oscillator
Crystal
Crystal
C
C
LOAD
LOAD
C
C
=
=
0x14
0x14
XO
XO
5.0
5.0
15
15
C
C
C
C
XI
XI
XI
XI
XO
XO
+ C
+ C
*
*
C
C
XO
XO
XO
XO
ai13906
ai13906
0x27
0x27
9.75
9.75
17.4
17.4
33/58