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LPC2138 RTC Crystal Connections

2005-02-10 by dharmaBum

If anyone has successfully used a 32 KHz crystal with the LPC2138, 
please explain how to connect the crystal.  

I saw an example on the Keil eval board where a resistor was 
connected in series with the crystal.  I don't understand how that 
circuit operates.

Generally, a 10M or other large resistor is connected in parallel 
with a crystal in order to bias the oscillator buffer (inside the 
uP) into its linear region.

Has Philips released a more complete data sheet or user manual?

Thanks for the help,
Wayne Radochonski

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