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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LPC2921 датащи(PDF) 74 Page - NXP Semiconductors |
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LPC2921 датащи(HTML) 74 Page - NXP Semiconductors |
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74 / 83 page  LPC2921_23_25_1 © NXP B.V. 2009. All rights reserved. Preliminary data sheet Rev. 01 — 15 June 2009 74 of 83 NXP Semiconductors LPC2921/2923/2925 ARM9 microcontroller with CAN, LIN, and USB 10.4 XIN_OSC input The input voltage to the on-chip oscillators is limited to 1.8 V. If the oscillator is driven by a clock in slave mode, it is recommended that the input be coupled through a capacitor with Ci = 100 pF. To limit the input voltage to the specified range, choose an additional capacitor to ground Cg which attenuates the input voltage by a factor Ci/(Ci +Cg). In slave mode, a minimum of 200 mVrms is needed. For more details see the LPC29xx User manual UM10316. 10.5 XIN_OSC Printed Circuit Board (PCB) layout guidelines The crystal should be connected on the PCB as close as possible to the oscillator input and output pins of the chip. Take care that the load capacitors Cx1 and Cx2, and Cx3 in case of third overtone crystal usage, have a common ground plane. The external components must also be connected to the ground plain. Loops must be made as small as possible, in order to keep the noise coupled in via the PCB as small as possible. Also parasitics should stay as small as possible. Values of Cx1 and Cx2 should be chosen smaller accordingly to the increase in parasitics of the PCB layout. Fig 31. Slave mode operation of the on-chip oscillator LPC29xx XIN_OSC Ci 100 pF Cg 002aae730 |
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