C8051F961-A-GM Silicon Labs, C8051F961-A-GM Datasheet - Page 100
C8051F961-A-GM
Manufacturer Part Number
C8051F961-A-GM
Description
8-bit Microcontrollers - MCU 128KB, DC-DC, LCD AES, QFN40
Manufacturer
Silicon Labs
Datasheet
1.C8051F960-A-GQ.pdf
(492 pages)
Specifications of C8051F961-A-GM
Rohs
yes
Core
8051
Processor Series
C8051
Data Bus Width
8 bit
Maximum Clock Frequency
25 MHz
Program Memory Size
128 KB
Data Ram Size
8448 B
On-chip Adc
Yes
Operating Supply Voltage
2.5 V to 3.3 V
Operating Temperature Range
- 40 C to + 85 C
Package / Case
QFN-40
Mounting Style
SMD/SMT
Number Of Programmable I/os
34
Number Of Timers
4
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C8051F96x
5.9. Voltage and Ground Reference Options
The voltage reference MUX is configurable to use an externally connected voltage reference, the internal
voltage reference, 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 dedi-
cated to analog ground (P0.1/AGND).
The voltage and ground reference options are configured using the REF0CN SFR described on SFR
Definition 5.15. REF0CN: Voltage Reference Control. 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 refer-
ence to ADC0, P0.1/AGND should be configured as an analog input and skipped by the Digital Crossbar.
Refer to Section “27. Port Input/Output” on page 351 for complete Port I/O configuration details. The exter-
nal reference voltage must be within the range 0 V
at the same dc voltage potential as GND.
100
4.7 F
B yp ass C apa citors
R eco m m en ded
G N D
V D D
+
R 1
R e ference
E xternal
V olta ge
C ircuit
0 .1 F
Figure 5.10. Voltage Reference Functional Block Diagram
P 0 .1/A G N D
P 0.0/V R E F
V B A T
REF
G N D
and AGND Inputs: Port pins are used as the external V
Rev. 0.5
R e gu late d D ig ital S up ply
H igh S p ee d R e ference
REF
R E F 0C N
Intern al 1.65V
Intern al 1 .8V
VDD and the external ground reference must be
E N
Te m p S enso r
R E FG N D
0 0
0 1
1 0
1 1
0
1
REF
and AGND
(to A D C )
(to A D C )
V R E F
G rou nd
A D C
In put
M u x
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