DSD: Delta Sigma Demodulator. XMC microcontrollers September 2016

Transcription

1 DSD: Delta Sigma Demodulator XMC microcontrollers September 2016

2 Agenda 1 Overview 2 Key feature: adjustable CIC filter 3 Key feature: parallel auxiliary CIC filter with boundaries 4 Key feature: resolver support 5 System integration 6 Application examples 2

3 Agenda 1 Overview 2 Key feature: adjustable CIC filter 3 Key feature: parallel auxiliary CIC filter with boundaries 4 Key feature: resolver support 5 System integration 6 Application examples 3

4 DSD Delta Sigma Demodulator 4 DSD Channel Highlights Pin Main Filter Fast Filter 1 Carrier Generator Carrier Generator Rectify Integrator Comperator Pin Pin Pin XMC 4000 provides four delta sigma demodulator channels and one carrier generator. It is tailored to demodulate a bitstream from an external delta sigma modulator. This can be used for isolated current/voltage measurement and for sensor interfaces. Key feature Adjustable CIC filter Parallel auxiliary CIC filter with boundaries Resolver support Customer benefits External sigma delta modulator can be connected directly to XMC without ASIC Simultaneous overcurrent/voltage detection with programmable boundary interrupt Resolver excitation and feedback reading with full hardware support saving external ASIC 4

5 Agenda 1 Overview 2 Key feature: adjustable CIC filter 3 Key feature: parallel auxiliary CIC filter with boundaries 4 Key feature: resolver support 5 System integration 6 Application examples 5

6 DSD Adjustable CIC filter (1/2) Each DSD channel supports 4 types of CIC filters: CIC, CIC², CIC³, CIC F The decimation factor can be selected independent from other channels: 4 to 256 Sensor Analog input DSM clock Bit stream DSD Multiple bit value CPU Configurable filter Legend: On- chip hardware Off- chip hardware Filter type: Decimation: Clock rate: COMB1-3, F CPU 6

7 DSD Adjustable CIC filter (2/2) Filter comparison *1 Decimation factor comparison *2 Responsetime [μs] Maximum output [Bit] 16 25,6 D: 32 D: 64 D: 128 3,2 6 6,4 11 9,6 6,6 11,1 6,4 12,8 6,4 3,2 12, CIC CIC² CIC³ CIC F Responsetime [μs] Update Time [μs] Maximum output [Bit] *1: Sample frequency 10 Mhz, decimation factor: 32 *2: Sample frequency 10 MHz, filter type: CIC³ 7

8 Agenda 1 Overview 2 Key feature: adjustable CIC filter 3 Key feature: parallel auxiliary CIC filter with boundaries 4 Key feature: resolver support 5 System integration 6 Application examples 8

9 DSD Parallel auxiliary filter with boundaries Each DSD channel has an auxiliary CIC filter 4 filter types can be selected (CIC, CIC², CIC³, CIC F) Decimation factor between 4 to 32 Hardware boundary check with interrupt to reduce CPU load Main filter Current analysis DSM Fast filter Comperator Interrupt overcurrent reaction Main filter Fast filter Filter type: COMB 3 Filter type: COMB 2 Decimation: 64 Decimation: 16 Legend: On- chip hardware Off- chip hardware Software Advantages Response time: Update time: Maximum output: 9.6 µs 3.2 µs 16-bit Response time: 3.2 µs Update time: 1.6 µs Maximum output: 9-bit 9

10 Agenda 1 Overview 2 Key feature: adjustable CIC filter 3 Key feature: parallel auxiliary CIC filter with boundaries 4 Key feature: resolver support 5 System integration 6 Application examples 10

11 DSD Resolver support (1/6) Hardware for resolver support Carrier generator Rectify (part of DSD channel) Integration (part of DSD channel) Carrier generator Amplifier Primary coil Legend: Angle calculation DSD channel DSD channel Isolation DSM Cosine coil Sine coil On- chip hardware Off- chip hardware Software 11

12 DSD Resolver support (2/6) carrier generator Carrier generator Hardware generated waveform without CPU load Waveform: sine, triangle and rectangle Output frequency between 3,7 khz and 58,6 khz * Signed signal for rectification Carrier generator PWM Amplifier Resolver Primary coil Signed signal Cosine coil Carrier generator Waveform: Sine coil Output frequency: MHz CPU * Peripheral clock 120 MHz 12

13 DSD Resolver support (3/6) rectifier Rectifier Hardware rectifier for carrier cancellation Hardware sign delay capture Adjustable sign delay compensation Main filter Integrator Rectify Filter output: Legend: On- chip hardware On- chip hardware in fokus Sign signal : Rectifier output: 13

14 DSD Resolver support (4/6) rectifier Sign delay compensation Angle calculation resolution depending on integration result Angle calculation Carrier generator Amplifier Angle calculation 2 DSD 3 DSM 2 Resolver Result sine coil Timing carrier generator Timing DSD With delay With delay compensation 14

15 DSD Resolver support (5/6) integrator Integrator Hardware integrator Adjustable integration window Continuous and trigger mode resolution 3 half waves Period Half wave Period 3 half waves Half wave time 15

16 DSD Resolver support (6/6) overview Legend: 1. Signal after COMB filter 2. Signal after rectify 3. Signal after integration 16

17 Agenda 1 Overview 2 Key feature: adjustable CIC filter 3 Key feature: parallel auxiliary CIC filter with boundaries 4 Key feature: resolver support 5 System integration 6 Application examples 17

18 DSD System integration NVIC XMC 4100 XMC 4200 XMC 4400 XMC 4500 GPIO ERU DSD Carrier generator GPIO DMA GPIO DSD is connected to GPIO, ERU, NVIC and DMA. In many applications it is mandatory to synchronize the carrier generator, the DSD and the external DSM. Therefore the DSD has implemented the carrier generator and provides a clock via GPIO for the DSM. Target applications Motor control Isolated current measurement Isolated voltage measurement The connection to the ERU enables a various of trigger sources. 18

19 Agenda 1 Overview 2 Key feature: adjustable CIC filter 3 Key feature: parallel auxiliary CIC filter with boundaries 4 Key feature: resolver support 5 System integration 6 Application examples 19

20 Application example Isolated current measurement Isolated Overview Motor control Angle calculation CCU8 CCU8 DSD channel DSD channel DSD channel Isolation Bridge driver Bridge DSM Legend: On- chip hardware Off- chip hardware Software All three currents are measured in phase with a DSM. The bits stream allows a cost-efficient digital isolation. The microcontroller is isolated against the high voltage part. Also a benefit is the good signal to noise ratio based on the oversampling. In brief In many high voltage applications an isolation is needed. The DSD offers the possibility for an isolation of the XMC MCU against the high voltage. 20

21 Application example Rotary angle detection via resolver DSD channel Isolated Overview Motor control DSD channel Carrier generator CCU8 CCU8 Isolation Bridge driver DSM Amplifier Bridge Cosine coil Sine coil Primary coil The angle coming as sine and cosine analog value from resolver are multiplied by the carrier signal. The XMC DSD provides hardware for carrier cancelation and data calibration. ADC In brief Amplifier Legend: On- chip hardware Off- chip hardware Software For a resolver analysis a data processing is necessary. The XMC offers many of these calculation in hardware. In addition on high voltage boards the resolver has to be isolated against the high voltage. In this case the XMC is on the high voltage side and the resolver is isolated. 21

22 General information For latest updates, please refer to: For support: 22

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