C8051F930DK Silicon Laboratories Inc, C8051F930DK Datasheet - Page 86

• Manufacturer Part Number: C8051F930DK
• Description: KIT DEV C8051F920,F921,F930,F931
• Manufacturer: Silicon Laboratories Inc
• Type: MCUr

Specifications of C8051F930DK

• Contents: Target Board, Power Adapter, USB Debug Adapter, Cables, Batteries, and Software
• Processor To Be Evaluated: C8051F930
• Processor Series: C8051F9xx
• Data Bus Width: 8 bit
• Interface Type: I2C, UART, SPI
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 0.9 V to 3.6 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: C8051F920, F921, F930, F931
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1473

C8051F93x-C8051F92x
5.7.
The voltage reference MUX is configurable to use an externally connected voltage reference, one of two
internal voltage references, or one of two power supply voltages (see Figure 5.10). The ground reference
MUX allows the ground reference for ADC0 to be selected between the ground pin (GND) or a port pin
dedicated to analog ground (P0.1/AGND).
The voltage and ground reference options are configured using the REF0CN SFR described on page 88.
Electrical specifications are can be found in the Electrical Specifications Chapter.
Important Note About the V
inputs. When using an external voltage reference or the internal precision reference, P0.0/VREF should be
configured as an analog input and skipped by the Digital Crossbar. When using AGND as the ground
reference to ADC0, P0.1/AGND should be configured as an analog input and skipped by the Digital
Crossbar. Refer to Section “21. Port Input/Output” on page 212 for complete Port I/O configuration details.
The external reference voltage must be within the range 0  V
reference must be at the same DC voltage potential as GND.
86
4 .7 F
B ypass C apacitors
R ecom m ended
G N D
V D D
Voltage and Ground Reference Options
+
R 1
R eference
Figure 5.10. Voltage Reference Functional Block Diagram
E xternal
V oltage
C ircuit
0 .1 F
P 0.1/A G N D
P 0 .0/V R E F
V D D /D C +
REF
G N D
and AGND Inputs: Port pins are used as the external V
Internal 1.68V
R E F O E
R eference
E N
Rev. 1.1
R egulated D igital S upply
H igh S peed R eference
R E F 0C N
Internal 1.65 V
Internal 1.8V
REF
 VDD/DC+ and the external ground
E N
T em p S ensor
R E F G N D
00
01
10
11
0
1
REF
and AGND
(to A D C )
(to A D C )
V R E F
G round
Input
A D C
M ux