參數(shù)資料
型號： FM33256-G
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDSO14
封裝： GREEN, MS-012AB, SOIC-14
文件頁數(shù)： 2/28頁
文件大?。?/td> 320K
代理商： FM33256-G
FM33256/FM3316 SPI Companion w/ FRAM
Rev. 2.0
Feb. 2009
Page 10 of 28
should be routed away from the X1/X2 pads. The X1
and X2 trace lengths should be less than 5 mm. The
use of a ground plane on the backside or inner board
layer is preferred. See layout example. Red is the top
layer, green is the bottom layer.
Layout for Surface Mount Crystal
Layout for Through Hole Crystal
(red = top layer, green = bottom layer)
Table 4. Digital Calibration Adjustments
Positive Calibration for slow clocks: Calibration will achieve
± 2.17 PPM after calibration
Measured Frequency Range
Error Range (PPM)
Min
Max
Min
Max
Program Calibration Register to:
0
512.0000
511.9989
0
2.17
000000
1
511.9989
511.9967
2.18
6.51
100001
2
511.9967
511.9944
6.52
10.85
100010
3
511.9944
511.9922
10.86
15.19
100011
4
511.9922
511.9900
15.20
19.53
100100
5
511.9900
511.9878
19.54
23.87
100101
6
511.9878
511.9856
23.88
28.21
100110
7
511.9856
511.9833
28.22
32.55
100111
8
511.9833
511.9811
32.56
36.89
101000
9
511.9811
511.9789
36.90
41.23
101001
10
511.9789
511.9767
41.24
45.57
101010
11
511.9767
511.9744
45.58
49.91
101011
12
511.9744
511.9722
49.92
54.25
101100
13
511.9722
511.9700
54.26
58.59
101101
14
511.9700
511.9678
58.60
62.93
101110
15
511.9678
511.9656
62.94
67.27
101111
16
511.9656
511.9633
67.28
71.61
110000
17
511.9633
511.9611
71.62
75.95
110001
18
511.9611
511.9589
75.96
80.29
110010
19
511.9589
511.9567
80.30
84.63
110011
20
511.9567
511.9544
84.64
88.97
110100
21
511.9544
511.9522
88.98
93.31
110101
22
511.9522
511.9500
93.32
97.65
110110
23
511.9500
511.9478
97.66
101.99
110111
24
511.9478
511.9456
102.00
106.33
111000
25
511.9456
511.9433
106.34
110.67
111001
26
511.9433
511.9411
110.68
115.01
111010
27
511.9411
511.9389
115.02
119.35
111011
28
511.9389
511.9367
119.36
123.69
111100
29
511.9367
511.9344
123.70
128.03
111101
30
511.9344
511.9322
128.04
132.37
111110
31
511.9322
511.9300
132.38
136.71
111111
Negative Calibration for fast clocks: Calibration will achieve
± 2.17 PPM after calibration
Measured Frequency Range
Error Range (PPM)
Min
Max
Min
Max
Program Calibration Register to:
/CS
SO
CNT
VBAK
X2
X1
VSS
/CS
SO
CNT
VBAK
X2
X1
VSS
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