FM33256/FM3316 SPI Companion w/ FRAM
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.
/CS
/CS
SO
SO
CNT
VBAK
X2
CNT
VBAK
X2
X1
X1
VSS
VSS
Layout for Surface Mount Crystal
(red = top layer, green = bottom layer)
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
Min
Max
Max
2.17
6.51
Program Calibration Register to:
000000
100001
100010
100011
100100
100101
100110
100111
101000
101001
101010
101011
101100
101101
101110
101111
110000
110001
110010
110011
110100
110101
110110
110111
111000
111001
111010
111011
111100
111101
111110
111111
0
1
2
3
4
5
6
7
8
512.0000
511.9989
511.9967
511.9944
511.9922
511.9900
511.9878
511.9856
511.9833
511.9811
511.9789
511.9767
511.9744
511.9722
511.9700
511.9678
511.9656
511.9633
511.9611
511.9589
511.9567
511.9544
511.9522
511.9500
511.9478
511.9456
511.9433
511.9411
511.9389
511.9367
511.9344
511.9322
511.9989
511.9967
511.9944
511.9922
511.9900
511.9878
511.9856
511.9833
511.9811
511.9789
511.9767
511.9744
511.9722
511.9700
511.9678
511.9656
511.9633
511.9611
511.9589
511.9567
511.9544
511.9522
511.9500
511.9478
511.9456
511.9433
511.9411
511.9389
511.9367
511.9344
511.9322
511.9300
0
2.18
6.52
10.85
15.19
19.53
23.87
28.21
32.55
36.89
41.23
45.57
49.91
54.25
58.59
62.93
67.27
71.61
75.95
80.29
84.63
88.97
93.31
97.65
101.99
106.33
110.67
115.01
119.35
123.69
128.03
132.37
136.71
10.86
15.20
19.54
23.88
28.22
32.56
36.90
41.24
45.58
49.92
54.26
58.60
62.94
67.28
71.62
75.96
80.30
84.64
88.98
93.32
97.66
102.00
106.34
110.68
115.02
119.36
123.70
128.04
132.38
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Negative Calibration for fast clocks: Calibration will achieve ± 2.17 PPM after calibration
Measured Frequency Range Error Range (PPM)
Min
512.0000
512.0011
Max
512.0011
512.0033
Min
0
2.18
Max
2.17
6.51
Program Calibration Register to:
0
1
000000
000001
Rev. 1.0
Dec. 2006
Page 10 of 28
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
