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C8051F040-GQR Datasheet(PDF) 70 Page - Silicon Laboratories

Part # C8051F040-GQR
Description  Mixed Signal ISP Flash MCU Family
Download  328 Pages
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

C8051F040-GQR Datasheet(HTML) 70 Page - Silicon Laboratories

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C8051F040/1/2/3/4/5/6/7
70
Rev. 1.5
6.1.1. Analog Input Configuration
The analog multiplexer routes signals from external analog input pins, Port 3 I/O pins (programmed to be
analog inputs), a High Voltage Difference Amplifier, and an on-chip temperature sensor as shown in
Figure 6.2.
Figure 6.2. Analog Input Diagram
Analog signals may be input from four external analog input pins (AIN0.0 through AIN0.3) as differential or
single-ended measurements. Additionally, Port 3 I/O Port Pins may be configured to input analog signals.
Port 3 pins configured as analog inputs are selected using the Port Pin Selection register (AMX0PRT). Any
number of Port 3 pins may be selected simultaneously as inputs to the AMUX. Even numbered Port 3 pins
and odd numbered Port 3 pins are routed to separate AMUX inputs. (Note: Even port pins and odd port
pins that are simultaneously selected will be shorted together as “wired-OR”.) In this way, differential mea-
surements may be made when using the Port 3 pins (voltage difference between selected even and odd
Port 3 pins) as shown in Figure 6.2.
The High-Voltage Difference Amplifier (HVDA) will accept analog input signals and reject up to 60 volts
common-mode for differential measurement of up to the reference voltage to the ADC (0 to VREF volts).
The output of the HVDA can be selected as an input to the ADC using the AMUX as any other channel is
selected for measurement.
+
-
+
-
+
-
9-to-1
AMUX
(SE or
DIFF)
AMX0CF
10-Bit
SAR
ADC
X
TEMP SENSOR
AGND
AIN0.0
AIN0.1
AIN0.2
AIN0.3
AMX0SL
0
7
6
5
4
3
2
1
8
HV
AMP
HVCAP
HVREF
HVAIN -
HVAIN +
P3.6
P3.4
P3.2
P3.0
P3.7
P3.5
P3.3
P3.1
(WIRED-OR)
(WIRED-OR)
PAIN0EN
PAIN2EN
PAIN4EN
PAIN6EN
PAIN7EN
PAIN5EN
PAIN3EN
PAIN1EN
P3EVEN
P3ODD
+
-


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