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LPC11U35FBD48401 Datasheet(PDF) 56 Page - NXP Semiconductors |
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LPC11U35FBD48401 Datasheet(HTML) 56 Page - NXP Semiconductors |
56 / 76 page LPC11U3X All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 2 — 25 November 2013 56 of 76 NXP Semiconductors LPC11U3x 32-bit ARM Cortex-M0 microcontroller 11.2 XTAL 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 mV (RMS) is needed. In slave mode, couple the input clock signal with a capacitor of 100 pF (Figure 29), with an amplitude between 200 mV (RMS) and 1000 mV (RMS). This signal corresponds to a square wave signal with a signal swing of between 280 mV and 1.4 V. The XTALOUT pin in this configuration can be left unconnected. External components and models used in oscillation mode are shown in Figure 30 and in Table 18 and Table 19. Since the feedback resistance is integrated on chip, only a crystal and the capacitances CX1 and CX2 need to be connected externally in case of fundamental mode oscillation (L, CL and RS represent the fundamental frequency). Capacitance CP in Figure 30 represents the parallel package capacitance and must not be larger than 7 pF. Parameters FOSC, CL, RS and CP are supplied by the crystal manufacturer. Fig 29. Slave mode operation of the on-chip oscillator Fig 30. Oscillator modes and models: oscillation mode of operation and external crystal model used for CX1/CX2 evaluation LPC1xxx XTALIN Ci 100 pF Cg 002aae788 002aaf424 LPC1xxx XTALIN XTALOUT CX2 CX1 XTAL = CL CP RS L |
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