FM6124-QG Ramtron, FM6124-QG Datasheet - Page 25

• Manufacturer Part Number: FM6124-QG
• Description: FRAM, 24KB, EVENT DATA REC, QFP44
• Manufacturer: Ramtron

Specifications of FM6124-QG

• Memory Size: 24KB
• Nvram Features: RTC
• Supply Voltage Range: 3V To 3.6V
• Memory Case Style: QFP
• No. Of Pins: 44
• Operating Temperature Range: -40°C To +85°C
• Package / Case: QFP
• Interface: I2C
• Memory: RoHS Compliant
• Interface Type: I2C, Serial, 2-Wire
• Rohs Compliant: Yes
• Access Time: 100 KBPs
• Operating Supply Voltage: 3 V to 3.6 V
• Mounting Style: SMD/SMT
• Lead Free Status / Rohs Status: Details

Layout Recommendations
The X1 and X2 crystal pins employ very high impedance circuits and the oscillator connected to these pins can be upset by
noise or extra loading. To reduce RTC clock errors from signal switching noise, a guard ring should be placed around these
pads and the guard ring grounded. High speed traces 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 below.
Table 5. Digital Calibration Adjustments
Rev. 4.0 (EOL)
July 2010
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
0
1
2
3
4
5
6
7
8
9
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
Measured Frequency Range
Min
Positive Calibration for slow clocks: Calibration will achieve ± 2.17 PPM after calibration
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
Max
F
IGURE
Error Range (PPM)
102.00
106.34
110.68
115.02
119.36
123.70
128.04
132.38
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
2.18
6.52
Min
27. PCB L
0
AYOUT
101.99
106.33
110.67
115.01
119.35
123.69
128.03
132.37
136.71
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
Max
2.17
6.51
E
XAMPLE
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
FM6124 Event Data Recorder
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