ams AS8579 Adapter Board User Guide

: June 6, 2024
: ams

Table of Contents

ams AS8579 Adapter Board
Introduction
Kit Content
Board Description
Hardware
Revision Information
Legal Information
References
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ams AS8579 Adapter Board

Introduction

This manual explains how to use the AS8579-SS_EK_AB hardware. The Hardware is designed to test and evaluate the features of AS8579 capacitive sensor. The AS8579 is a sensor, which measures the capacitive value by separately measuring the 10-bit Information (accumulated to 14-bit) of I and Q. This 14-bit information provides the capacitance of the application. The I and Q data can be read over a standard SPI interface.
For first setting up, please see application note: AS8579_SPI_Configuration_AN001003_1-00.

Kit Content

Figure 1:
AS8579 Adapter Board Kit Content

ams-AS8579-Adapter-Board -fig 1 Ordering Information

Ordering Code	Description
AS8579-SS_EK_AB	AS8579 Adapter Board

Board Description

The PCB can be connected via standard SPI to a microcontroller. The Production Programmer from SD4Y and the ams I&P-Box are also recommended tools for communication/programming interface.
If you want to connect the I&P box to the Adapter Board, a level shifter is needed (the I&P Box works with 3.3 V voltage levels).
The PCB is equipped with all necessary peripheral components for easy evaluation.

Figure 2:
AS8579 Adapter Board

Figure 3: BOM

Symbol	Description
U1	Capacitive sensor AS8579
C1	Capacitor 100 nF
C2	Capacitor 1 µF
X1	Oscillator 48 MHz

Detailed Description
Figure 4:
AS8579 Adapter Board Overview Figure 5: Description

Components	Description
Supply	Pin 5 V supply and ground
SPI Pins	Communication and Programming Interface
SEN Lines	Sensing interface
VAR/ FIX SEN	Pins for cable and PCB shielding

Oscillator

| Oscillator for clock generation of system clock frequency input

Settings: EDIV=0000b (default value) -> CLK_E divider is 12 and resulting system clock is 4 Mz

AS8579| Capacitive sensor
Bypass Caps| Recommended decoupling capacitors

Pinout
Figure 6:
AS8579 Adapter Board Pinout

Figure 7: Pinout

Pin #	Symbol	Description
P1-1	SEN0
P1-2	SEN1
P1-3	SEN2
P1-4	SEN3

Sensing Lines (0-7)
P1-5| SEN4|
P1-6| SEN5|
P1-7| SEN6|
P1-8| SEN7|
P1-9| 5V| 5 V supply
P1-10| GND| Ground
P1-11| CSn| SPI – Chip select
P1-12| MOSI| SPI – Master out slave in
P1-13| CLK| SPI – Clock
P1-14| MISO| SPI – Master in slave out
P1-15| SEN9|
Sensing Lines (8-9)
P1-16| SEN8|
P2-1| FIX_SEN| PCB shielding driver
P2-2| VAR_SEN| Cable shielding driver

Hardware

Schematic

Figure 8: Schematic

ams-AS8579-Adapter-Board -fig 5 ams-AS8579
-Adapter-Board -fig 6 Layout

Figure 9: PCB Layout

Revision Information

Changes from previous version to current revision v1-00	Page
Initial production version	all

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.

Legal Information

Copyrights & Disclaimer
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