C8051F413-GM Silicon Laboratories Inc, C8051F413-GM Datasheet - Page 77

• Manufacturer Part Number: C8051F413-GM
• Description: IC 8051 MCU 16K FLASH 28QFN
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F41xr

Specifications of C8051F413-GM

• Program Memory Type: FLASH
• Program Memory Size: 16KB (16K x 8)
• Package / Case: 28-QFN
• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 50MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
• Number Of I /o: 20
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.25 V
• Data Converters: A/D 20x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: C8051F4x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 2.25 KB
• Interface Type: I2C/SMBus/SPI/UART
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 20
• Number Of Timers: 4
• Operating Supply Voltage: 2 V to 5.25 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F410DK
• Minimum Operating Temperature: - 40 C
• On-chip Dac: 2-ch x 12-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 770-1006 - ISP 4PORT FOR SILABS C8051F MCU336-1454 - ADAPTER PROGRAM TOOLSTICK F411336-1317 - KIT EVAL FOR C8051F411336-1314 - KIT DEV FOR C8051F41X
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1311

C8051F410/1/2/3
7.
Voltage Reference
The Voltage reference MUX on C8051F41x devices is configurable to use an externally connected voltage
reference, the internal reference voltage generator, or the V
power supply voltage (see Figure 7.1). The
DD
REFSL bit in the Reference Control register (REF0CN) selects the reference source. For an external
source or the internal reference, REFSL should be set to ‘0’. To use V
as the reference source, REFSL
DD
should be set to ‘1’.
The internal voltage reference circuit consists of a temperature stable bandgap voltage reference genera-
tor and a gain-of-two output buffer amplifier. The output voltage is selected between 1.5 V and 2.2 V. The
internal voltage reference can be driven out on the V
pin by setting the REFBE bit in register REF0CN
REF
to a ‘1’ (see Figure 7.1). The load seen by the V
pin must draw less than 200 µA to GND. When using
REF
the internal voltage reference, bypass capacitors of 0.1 µF and 4.7 µF are recommended from the V
REF
pin to GND. If the internal reference is not used, the REFBE bit should be cleared to ‘0’.
The BIASE bit enables the internal voltage bias generator, which is used by the ADC, Temperature Sensor,
internal oscillators, and IDACs. This bit is forced to logic 1 when any of the aforementioned peripherals are
enabled. The bias generator may be enabled manually by writing a ‘1’ to the BIASE bit in register
REF0CN; see SFR Definition 7.1 for REF0CN register details.
The electrical specifications for the voltage reference circuit are given in Table 7.1.
REFLV
Figure 7.1. Voltage Reference Functional Block Diagram
Rev. 1.1
77