C8051F819-GM Silicon Laboratories Inc, C8051F819-GM Datasheet - Page 60

• Manufacturer Part Number: C8051F819-GM
• Description: IC MCU 8BIT 8KB FLASH 20QFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F81xr

Specifications of C8051F819-GM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 25MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Cap Sense, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-QFN
• Processor Series: C8051F8x
• Core: 8051
• Data Bus Width: 16 bit
• Data Ram Size: 512 B
• Interface Type: I2C, SPI, UART
• Maximum Clock Frequency: 25 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 3
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F800DK
• Minimum Operating Temperature: - 55 C
• Package: 20QFN EP
• Device Core: 8051
• Family Name: C8051F8xx
• Maximum Speed: 25 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details
• Other names: 336-1799-5

C8051F80x-83x
10. Voltage and Ground Reference Options
The voltage reference MUX is configurable to use an externally connected voltage reference, the on-chip
voltage reference, or one of two power supply voltages (see Figure 10.1). 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 page 62.
Electrical specifications are can be found in the Electrical Specifications Chapter.
Important Note About the V
inputs. When using an external voltage 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 “23. Port Input/Out-
put” on page 138 for complete Port I/O configuration details. The external reference voltage must be within
the range 0  V
GND.
60
4.7F
Bypass Capacitors
Recommended
GND
VDD
+
R1
Reference
External
Voltage
Circuit
0.1F
REF
Figure 10.1. Voltage Reference Functional Block Diagram
 V
P0.1/AGND
P0.0/VREF
DD
and the external ground reference must be at the same DC voltage potential as
GND
V
DD
REF
and AGND Inputs: Port pins are used as the external V
Regulated Digital Supply
High Speed Reference
REF0CN
Rev. 1.0
Internal 1.65V
Internal 1.8V
IOSCEN
EN
EN
REFGND
Bias Generator
Temp Sensor
00
01
10
11
0
1
To Analog Mux
REF
To ADC, Internal
Oscillator,
Reference,
TempSensor
and AGND