C8051F131R Silicon Labs, C8051F131R Datasheet - Page 105

• Manufacturer Part Number: C8051F131R
• Description: 8-bit Microcontrollers - MCU 128kB 100MIPS 8448B RAM
• Manufacturer: Silicon Labs

Specifications of C8051F131R

• Product Category: 8-bit Microcontrollers - MCU
• Core: 8051
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 100 MHz
• Program Memory Size: 128 KB
• Data Ram Size: 8.25 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: 9
• Data Rom Size: 64 KB
• Interface Type: I2C, 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: 3 V

8.
The C8051F12x devices include two on-chip 12-bit voltage-mode Digital-to-Analog Converters (DACs).
Each DAC has an output swing of 0 V to (VREF-1LSB) for a corresponding input code range of 0x000 to
0xFFF. The DACs may be enabled/disabled via their corresponding control registers, DAC0CN and
DAC1CN. While disabled, the DAC output is maintained in a high-impedance state, and the DAC supply
current falls to 1 µA or less. The voltage reference for each DAC is supplied at the VREFD pin
(C8051F120/2/4/6 devices) or the VREF pin (C8051F121/3/5/7 devices). Note that the VREF pin on
C8051F121/3/5/7 devices may be driven by the internal voltage reference or an external source. If the
internal voltage reference is used it must be enabled in order for the DAC outputs to be valid. See
“9. Voltage Reference” on page 113
DACs.
8.1.
Each DAC features a flexible output update mechanism which allows for seamless full-scale changes and
supports jitter-free updates for waveform generation. The following examples are written in terms of DAC0,
but DAC1 operation is identical.
DACs, 12-Bit Voltage Mode (C8051F12x Only)
DAC Output Scheduling
DAC0MD1
DAC0MD0
DAC1MD1
DAC1MD0
DAC0DF2
DAC0DF1
DAC0DF0
DAC1DF2
DAC1DF1
DAC1DF0
DAC0EN
DAC1EN
Figure 8.1. DAC Functional Block Diagram
8
8
8
8
8
8
8
8
for more information on configuring the voltage reference for the
12
12
Rev. 1.4
REF
REF
DAC0
DAC1
C8051F120/1/2/3/4/5/6/7
C8051F130/1/2/3
AGND
AGND
AV+
AV+
DAC0
DAC1
Section
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