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FM3130-DG датащи(PDF) 5 Page - Ramtron International Corporation |
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FM3130-DG датащи(HTML) 5 Page - Ramtron International Corporation |
5 / 22 page O BS O LE TE N o D ire ct R ep la ce m en t Al te rn at iv e: FM 31 64 FM3130 Integrated RTC/Alarm with 64Kb FRAM Rev. 3.2 Sept. 2011 Page 5 of 22 Figure 3. External Oscillator In the example, R1 and R2 are chosen such that the X2 voltage is centered around the oscillator drive levels. If you wish to avoid the DC current, you may choose to drive X1 with an external clock and X2 with an inverted clock using a CMOS inverter. 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. SDA and SCL 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. 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) (red = top layer, green = bottom layer) Table 2. 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 X1 Vdd FM3130 R1 R2 X1 X2 VBAK VSS X1 X2 VBAK VSS |
Аналогичный номер детали - FM3130-DG |
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Аналогичное описание - FM3130-DG |
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