ams SPI Configuration AN001003 Instruction Manual
- June 6, 2024
- ams
Table of Contents
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
| Name | Description |
|---|---|
| TXV | Sensor Driver Voltage Selection |
| SDG | Shield (VAR_SEN) Gain Selection: programmable scaling factor for |
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.
-
Verify SPI Communication (Read Sensor ID)
-
SET EDIV Register (Address 0x30) to 0x00 –> set ECLK=4 MHz
-
SET FREQ Register (Address 0x31) to 0x03 –> set fOUTDriver=125 kHz
-
SET TXV Register (Address 0x32) to 0x02 –> VOUT=1Vp-p
-
SET SEN0 Line to the Sensor Driver (enable SEN0 Line) (Address 0x33; Value 0x01)
-
Reset DSP & ADC Stop (Write 0x28 into Address 0x3A)
-
Start Continuous Conversation (write 0x2A into address 0x3A)
-
Wait for ADC complete Bit (Address: 0x05 / Value: 0x01)
-
Perform Readout (Command: 0x90 / 5 Bytes transferred)
Revision Information
Initial version————————————–
——————————————————-
- Page and figure numbers for the previous version may differ from page and figure numbers in the current revision.
- Correction of typographical errors is not explicitly mentioned.
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Application Note • PUBLIC
AN001003 • v1-00 • 2020-Dec-24