C8051T610DB32 Silicon Laboratories Inc, C8051T610DB32 Datasheet - Page 54

• Manufacturer Part Number: C8051T610DB32
• Description: DAUGHT BOARD T610 32TQFP SOCKET
• Manufacturer: Silicon Laboratories Inc

Specifications of C8051T610DB32

• Module/board Type: Socket Module - TQFP
• Processor To Be Evaluated: C8051T61x
• Interface Type: USB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: C8051T610DK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 336-1505

C8051T610/1/2/3/4/5/6/7
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
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
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-
erence circuit are given in Section “7. Electrical Characteristics” on page 31.
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.
54
VDD
GND
Recommended Bypass
4.7F
Figure 10.1. Voltage Reference Functional Block Diagram
R1
Capacitors
+
Reference
External
Voltage
Circuit
0.1F
VREF
VDD
DD
REF0CN
), or the regulated 1.8 V internal supply (see Figure 10.1).
Rev 1.0
0
1
Regulator
Internal
REGOVR
EN
0
1
Temp Sensor
To Analog Mux
VREF
(to ADC)
DD