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Basic Clock Module Operation
Using an External Resistor (R
The DCO temperature coefficient can be reduced by using an external resistor
R
OSC
shows the typical relationship of f
external resistor options. Using an external R
temperature coefficient to approximately 0.1%/C. See the device-specific data
sheet for parameters.
R
OSC
internal resistor nominal value is approximately 300 kΩ, allowing the DCO to
operate up to approximately 5 MHz. When using an external R
approximately 100 kΩ the DCO can operate up to approximately 10 MHz. The
user should take care to not exceed the maximum MCLK frequency specified
in the datasheet, even though the DCO is capable of exceeding it.
Figure 4−6. DCO Frequency vs. Temperature
f DCO
25%
0
−25%
4-8
Basic Clock Module
) for the DCO
OSC
tied to DV
to source the current for the DC generator. Figure 4−6
CC
also allows the DCO to operate at higher frequencies. For example, the
−50
0
vs. temperature for both the internal and
DCO
reduces the DCO
OSC
External
Internal
50
100
of
OSC
Celsius
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