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10. Voltage Reference Options
The Voltage reference multiplexer for the ADC is configurable to use an externally connected voltage refer-
ence, the unregulated power supply voltage (V DD ), or the regulated 1.8 V internal supply (see Figure 10.1).
The REFSL bit in the Reference Control register (REF0CN, SFR Definition 10.1) selects the reference
source for the ADC. For an external source, REFSL should be set to 0 to select the VREF pin. To use V DD
as the reference source, REFSL should be set to 1. To override this selection and use the internal regulator
as the reference source, the REGOVR bit can be set to 1. The electrical specifications for the voltage ref-
Important Note about the VREF Pin: When using an external voltage reference, the VREF pin should be
configured as an analog pin and skipped by the Digital Crossbar. Refer to Section “21. Port Input/Output”
on page 113 for the location of the VREF pin, as well as details of how to configure the pin in analog mode
and to be skipped by the crossbar.
REF0CN
VDD
External
EN
Temp Sensor
To Analog Mux
Voltage
Reference
R1
Circuit
VREF
0
0
GND
VDD
1
VREF
(to ADC)
4.7 ? F
+
0.1 ? F
Internal
Regulator
1
REGOVR
Recommended Bypass
Capacitors
Figure 10.1. Voltage Reference Functional Block Diagram
54
Rev 1.1
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