C8051F045R Silicon Labs, C8051F045R Datasheet - Page 48

• Manufacturer Part Number: C8051F045R
• Description: 8-bit Microcontrollers - MCU 25 MIPS 64KB 10ADC
• Manufacturer: Silicon Labs

Specifications of C8051F045R

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 25 MHz
• Program Memory Size: 64 KB
• Data Ram Size: 4.25 KB
• On-chip Adc: Yes
• Operating Supply Voltage: 2.7 V to 3.6 V
• Package / Case: TQFP-64
• Mounting Style: SMD/SMT
• A/d Bit Size: 10 bit
• A/d Channels Available: 13
• Data Rom Size: 64 KB
• Interface Type: CAN, SMBus, SPI, UART
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Number Of Programmable I/os: 32
• Number Of Timers: 16 bit
• Processor Series: C8051
• Program Memory Type: Flash
• Factory Pack Quantity: 500
• Supply Voltage - Max: 3.6 V
• Supply Voltage - Min: 2.7 V

C8051F040/1/2/3/4/5/6/7
5.1.1. Analog Input Configuration
The analog multiplexer routes signals from external analog input pins, Port 3 I/O pins (See
“17.1.5. Configuring Port 1, 2, and 3 Pins as Analog Inputs” on page
Amplifier, and an on-chip temperature sensor as shown in Figure 5.2.
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 5.2.
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 input. (See
48
PAIN0EN
PAIN2EN
PAIN4EN
PAIN6EN
PAIN1EN
PAIN3EN
PAIN5EN
PAIN7EN
HVAIN +
HVAIN -
HVCAP
HVREF
AIN0.0
AIN0.1
AIN0.2
AIN0.3
P3.6
P3.4
P3.2
P3.0
P3.7
P3.5
P3.3
P3.1
Section “5.2. High-Voltage Difference Amplifier” on page
Figure 5.2. Analog Input Diagram
AGND
TEMP SENSOR
P3EVEN
(WIRED-OR)
P3ODD
(WIRED-OR)
AMP
HV
Rev. 1.5
+
+
+
+
-
-
-
-
0
1
2
3
4
5
6
7
8
AMUX
(SE or
9-to-1
DIFF)
X
AMX0CF
AMX0SL
207), a High Voltage Difference
52).
ADC
12-Bit
SAR
Section