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參數(shù)資料
| 型號： | M41T93ZQA6F |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PQCC16 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, QFN-16 |
| 文件頁數(shù)： | 17/49頁 |
| 文件大小： | 719K |
| 代理商： | M41T93ZQA6F |
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Clock operation
M41T93
Doc ID 12615 Rev 5
The on-chip capacitance can be calculated as follows:
For example:
CLOAD (12h = x0000000) = 12.5 pF
CLOAD (12h =11001000) = 3.5 pF and
CLOAD (12h = 00100111) = 17.4 pF
The oscillator sees a minimum of 3.5 pF with no programmable load capacitance selected.
Note:
These are typical values, and the total load capacitance seen by the crystal will include
approximately 1-2 pF of package and board capacitance in addition to the analog calibration
register value.
Any invalid value of analog calibration will result in the default capacitance of 25 pF.
The combination of analog and digital trimming can give up to –93 to +156 ppm of the total
adjustment.
Figure 11 represents a typical curve of clock ppm adjustment versus the Analog Calibration
value. This curve may vary with different crystals, so it is good practice to evaluate the
crystal to be used with an M41T93 device before establishing the adjustment values for the
application in question.
Figure 11.
Clock accuracy vs. on-chip load capacitors
C
LOAD
AC6 AC0 value
–
decimal
,
() 0.25pF
×
[] 7pF
+
=
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
A
DJUSTM
ENT
OFFSET TO
CXI, CXO (pF)
NET EQUIV. LOAD
CAP., C LOAD, (pF)
10
3.5
5.0
7.5
12.5
15
17.4
0xC8 0xBC
0xA8
0x94
0x00
0x14
0x27
INCREASING LOAD CAP.
SLOWER
FASTER
XO
XI
Crystal
Oscillator
CXO
CXI
CLOAD =
CXI + CXO
CXI * CXO
On-Chip
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| M41T93RQA6F | 1 TIMER(S), REAL TIME CLOCK, PQCC16 |
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