C8051F351-GMR Silicon Laboratories Inc, C8051F351-GMR Datasheet - Page 73

• Manufacturer Part Number: C8051F351-GMR
• Description: IC 8051 MCU 8K FLASH 28MLP
• Manufacturer: Silicon Laboratories Inc
• Series: C8051F35xr

Specifications of C8051F351-GMR

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 50MHz
• Connectivity: SMBus (2-Wire/I²C), SPI, UART/USART
• Peripherals: POR, PWM, Temp Sensor, WDT
• Number Of I /o: 17
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Data Converters: A/D 8x24b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Processor Series: C8051F3x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 768 B
• Interface Type: I2C, SMBus, SPI, UART
• Maximum Clock Frequency: 50 MHz
• Number Of Programmable I/os: 17
• Number Of Timers: 4
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: KSK-SL-TOOLSTICK, PK51, CA51, A51, ULINK2
• Development Tools By Supplier: C8051F350DK
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 24 bit, 8 Channel
• On-chip Dac: 8 bit, 2 Channel
• For Use With: 336-1083 - DEV KIT FOR F350/351/352/353
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

7.
There are two voltage reference options for the C8051F350/1/2/3 ADCs: the internal 2.5 V reference volt-
age, or an external reference voltage (see Figure 7.1). The AD0VREF bit in the ADC0CF register selects
the reference source.
The internal voltage reference circuit consists of a 1.25 V, temperature stable bandgap voltage reference
generator and a gain-of-two output buffer amplifier, to produce a 2.5 V voltage reference. When the inter-
nal voltage reference is used, it is driven out on the VREF+ pin. In this configuration, the VREF– must be
connected to the AGND pin external to the device. See Section “24. Revision Specific Behavior’ on
page 227 for more information. The internal voltage reference is enabled by setting the AD0EN bit in regis-
ter ADC0MD to ‘1’ and clearing the AD0VREF bit in register ADC0CF to ‘0’ (See Section “5. 24 or 16-Bit
Analog to Digital Converter (ADC0)’ on page 41). Electrical specifications for the internal voltage reference
and bias generators are given in Table 7.1.
The internal oscillator bias generator is automatically enabled whenever the internal oscillator is enabled.
For power requirement characterization, the BIASE bit in register REF0CN can also be used to enable the
internal oscillator bias generator, when the oscillator itself is not enabled. Likewise, the REFBE bit in regis-
ter REF0CN can be used to enable the internal bandgap generator, which is used by the ADC, the IDACs,
the Clock Multiplier, and the internal Voltage Reference. The internal reference bias generator is automati-
cally enabled whenever a peripheral requires it. See SFR Definition 7.1 for the REF0CN register descrip-
tion.
Reference
(Optional)
External
Voltage
Voltage Reference
(Recommended)
Capacitors
Bypass
+
Figure 7.1. Reference Circuitry Block Diagram
VREF+
VREF–
REFBE
BIASE
AD0VREF
AD0EN
IOSCEN
IDA0EN
IDA1EN
MULEN
AD0EN
Rev. 1.1
VREF to ADC
EN
EN
C8051F350/1/2/3
EN
Bias Generator
Oscillator Bias
Generator
Reference
Reference
Internal
Internal
Buffer
2.5 V
To Internal
Oscillator
To ADC, IDACs,
Clock Multiplier
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