University Program Advance Material

Transcription

1 University Program Advance Material

2 Advance Material Modules Introduction ti to C8051F360 Analog Performance Measurement (ADC and DAC) Detailed overview of system variances, parameters (offset, gain, linearity) and compensation techniques Digital Signal Processing Discussions i and implementations ti of oversampling and averaging, simple co-efficient FIR filter, Goertzel algorithm for DTMF decoding, FFT, and polynomial calculations Mixed-Signal Design Techniques Printed circuit board design tips to optimize analog performance Techniques for identifying noise sources and minimizing their effect on analog measurements 2

3 Introduction to C8051F360

4 Silicon Labs Mixed-Signal MCUs Smallest 3x3 mm, 4x4 mm, 5x5 mm packages Very flexible I/O system to maximize pin functions Highest integration ti in class Peak MIPS Fastest Fastest 8-Bit CPU available 100 MHz 70% of instructions 1 or 2 cycles On-chip debugging hardware 8051 compatible 0 A B C Silicon Silicon Labs Labs Best analog ADCs DACs Precision oscillator Comparators On-chip temperature sensor 4

5 Bringing 21st Century Technology to the 8051 Flash Memory: On-chip charge pump Small segments Security Emulates byte EEPROM Serial Communications: UART SPI SMBus USB 2.0 CAN 2.0B I/O: Dynamically reconfigurable Analog: Temperature sensor Programmable comparators Precision Oscillator Cross Bar: Custom select I/O 8051 CPU: Up to 100 MHz 70% Instr. in 1 or 2 cycles Pipelined object code compatibility Timers: Capture & Compare Accumulate PWM RTC Analog-to-Digital: Up to 16-Bit SAR Up to 24-Bit Sigma-Delta Up to 1 Msps Dual ADC option Up to 32-Channels Selectable V REF Digital-to-Analog: Up to 12-Bit Debug: On-chip JTAG-based 5

6 Introducing the C8051F360 Family Industry first for high h speed, accurate analog, and small size 100 MIPS CPU with 16x16 MAC 200 ksps, 10-bit ADC with a maximum ±1LSB INL Error 10-bit Programmable DAC As small as a 5x5 mm package Pin compatible with the C8051F310 and C8051F311 family for easy upgrade or cost reduction paths using the same hardware Functionally dense 8-bit MCU for consumer products, communication systems and industrial control Factory automation, motor control, touch panels, satellite receiver communications, displays, intelligent power supplies 6

7 7 C8051F360 Performance Advantages

8 Superior Computing Power 100 MIPS 8-bit CPU Uses an 8051 architecture allowing the engineer to re-use the existing 300 million man-hours of code this saves expensive software development cost! 100 MIPS allows the designer to give end products higher end features in software without adding hardware and cost 16x16 Multiply l and Accumulate Save CPU bandwidth with a feature typically found on DSPs Allows high end features or digital filtering can replace analog filters This reduces the BOM cost by replacing analog components on the circuit board 2. Add a 0 +(a 1 + (a 2 + a 3 x)x)x 1. Multiply Complex computations solved! 8

9 High-Performance Analog Functions Fast and accurate 10-bit ADC 200 ksps and high linearity means the ADC will make fast and accurate voltage measurements Often in a small form factor, ADC performance will degrade, but not on the F360! Programmable 10-bit DAC Typically a PWM + an external filter is used in this class of MCU Slower response may limit product capability Output signal low-quality such as sounds The F360 has a programmable DAC for: Fast response time for better control in the end-product Clearer signals output, such as sound effects and tones 9

10 System-Level Performance Measurement

11 ToolStick Base Adapter Hardware Overview USB Connector For debugging, programming and communication via PC software Run/Stop LEDs Indicate if target MCU is running or halted Socket Connector Connects to 14-pin card-edge connector on ToolStick daughter cards Power LED Indicates USB bus power Silicon Laboratories MCU Performs USB debug adapter and PC communication functions 11

12 ToolStickF36x Hardware Overview I to V Converter (Resistor) Power LED Indicates 3.3 V is available P1.3 LED General purpose LED for C8051F362 Target MCU C8051F362 Complete Pin Access Standard 100 mil spacing for P0 and P1 P2.4 Pushbutton Switch For simple user interface P1.6 Potentiometer Linear output that sweeps from 0 V to 3.3 V 12

13 System Block Diagram 3.3V C8051F362 0 to 2V Across Resistor 1k 0 to 2mA 10 bit IDAC UART ToolStick Base Adapter USB 10 bit ADC VREF 2.4 V 13 We will measure some common performance specifications using the above system The IDAC will be used as a signal source for various ADC measurements

14 DC Noise Measurement Using a Histogram 3.3V 1k 1mA DC 10 bit IDAC C8051F362 UART ToolStick Base Adapter ADC Results Sent to PC USB 1V DC at ADC Input 10 bit ADC VREF 2.4 V To measure DC Noise, the IDAC is set at 1mA output to generate 1 V at the ADC input the expected code output is: (1V / 2.4V) x 1024 = 427 ADC samples are collected and sent to the PC for processing 14

15 Dynamic Performance Measurement 3.3V 3 1k 0-2mA Sine 10 bit IDAC C8051F362 UART ToolStick Base Adapter ADC Results Sent to PC USB 0-2V Sine at ADC Input 10 bit ADC VREF 2.4 V To measure dynamic performance of the system, a 2 ma peak-to-peak sine wave is generated at the DAC output The ADC samples the 0-2V sine wave produced and the data is sent to the PC for processing 15

16 Settling Time 3.3V 1k 1mA DC 10 bit IDAC C8051F362 UART ToolStick Base Adapter ADC Results Sent to PC USB 0-3.3V Square Wave on 2 nd Channel 10 bit ADC VREF 2.4 V Switching Mux Every Sample Two ADC MUX channels are sampled back-to-back One = 1 V DC, Two = V Square Wave Software selects duration of settling time ADC Results are sent to the PC 16

17 Appendix: Running the Software

18 Overview of the Virtual Display Software A B C D E A: Selection box for available ToolSticks If a ToolStick is plugged in via USB, it will appear here B: Connect Button Makes a connection to the selected ToolStick C: Opens a terminal window D: Opens an LCD window E: Opens an oscilloscope window 18

19 Overview of the Terminal A C D B A: Transfer Data Window information typed here will be sent when the Send Data button is pressed B: Receive Data Window displays any received data C: Data Format change between ASCII and Hexadecimal display D: Capture Data Function use use to capture data to a file 19

20 Overview of the Virtual LCD The Virtual LCD is not used as part of this presentation it is simply a character display program 20

21 Overview of the Virtual Oscilloscope A B C A: Data Display Window displays Raw, FFT, or Histogram Data B: Trigger Options set up triggers on other channels C: Position Options change scale and position of waveform D: Data Options Print, Save, Clear, Stop/Start, and Close D 21

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