C8051T606DK Silicon Laboratories Inc, C8051T606DK Datasheet - Page 55

• Manufacturer Part Number: C8051T606DK
• Description: KIT DEVELOPMENT FOR C8051T606
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051T606DK

• Contents: Board, Adapter, Cable, CD, Power Supply
• Processor To Be Evaluated: C8051T606x
• Interface Type: RS-232, USB
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 3.3 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: C8051T606
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1666

11. Voltage Reference Options
The voltage reference multiplexer for the ADC is configurable for use with an externally connected voltage
reference, the unregulated power supply voltage (V
Figure 11.1). The REFSL bit in the Reference Control register (REF0CN, SFR Definition 11.1) 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
regulator as the reference source, the REGOVR bit can be set to 1. The electrical specifications for the
voltage reference circuit are given in Section “8. Electrical Characteristics” on page 30.
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 “22. Port Input/Output”
on page 106 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.
DD
as the reference source, REFSL should be set to 1. To override this selection and use the internal
GND
VDD
Recommended Bypass
4.7F
Figure 11.1. Voltage Reference Functional Block Diagram
R1
Capacitors
+
Reference
External
Voltage
Circuit
0.1F
VREF
VDD
REF0CN
Rev. 1.2
0
1
Regulator
Internal
DD
), or the regulated 1.8 V internal supply (see
C8051T600/1/2/3/4/5/6
REGOVR
EN
0
1
Temp Sensor
To Analog Mux
VREF
(to ADC)
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