ams SPI Configuration AN001003 Instruction Manual

Application Note
AN001003
AS8579
SPI Configuration (Quick Setup)
v1-00 · 2020-Dec-24

Introduction

This application note describes minimum necessary configuration for measurement setup and gives a rough overview of configurable parameters, which can be set over SPI Interface.

The parameter values are dependent on the load and its application. This application note gives a general overview and help at first quick evaluation.

Figure 1:
Application Circuitry – Minimum Circuitry for Evaluation

System Parameters Overview

Figure 2:
Block Diagram and Configurable Parameters

Figure 3:
Configurable Parameters

shielding (e.g.: cable shielding)
MUX| Control of internal connection of SEN-channels
CBG| Current Buffer Gain Selection: programmable scaling factors for trans- impedance amplifier (current – voltage conversion)
DCLK| Demodulation clock frequency for I and Q-path
PGA| PGA voltage Gain. Adjusts the input voltage to the ADC to optimize its conversion resolution.
OFFSET_I PGA| The offset compensates for the parasitic offsets in the sensor system and allows shifting DC operating point in order to maximize the ADC range.
OFFSET_Q PGA
ADCTL| ADC Control

Initialization

Figure 4:
Starting Sequence with Minimum Configurations

Example

The AS8579 is using a standard SPI Interface to write and read the Registers. To configure the AS8579 properly for a continuous readout, please perform the following steps.
After configuring all this settings the sensor can be read out permanently.

1. Verify SPI Communication (Read Sensor ID)

2. SET EDIV Register (Address 0x30) to 0x00 –> set ECLK=4 MHz

3. SET FREQ Register (Address 0x31) to 0x03 –> set fOUTDriver=125 kHz

4. SET TXV Register (Address 0x32) to 0x02 –> VOUT=1Vp-p

5. SET SEN0 Line to the Sensor Driver (enable SEN0 Line) (Address 0x33; Value 0x01)

6. Reset DSP & ADC Stop (Write 0x28 into Address 0x3A)

7. Start Continuous Conversation (write 0x2A into address 0x3A)

8. Wait for ADC complete Bit (Address: 0x05 / Value: 0x01)

9. Perform Readout (Command: 0x90 / 5 Bytes transferred)

Revision Information

Initial version————————————–
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• Correction of typographical errors is not explicitly mentioned.

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Application Note • PUBLIC
AN001003 • v1-00 • 2020-Dec-24

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