AMS AS726x-iSPI Manual de usuario

AS726x-iSPI Evaluation Kit User Guide

ams AS726x-iSPI User Guide

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AS726x-iSPI

Evaluation Kit User Guide

AS726x-iSPI

Evaluation Kit User Guide

ams AS726x-iSPI User Guide

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Content Guide

1Introduction .......................................................................................................................... 3

1.1 Kit Content ........................................................................................................................... 3

1.2 Connection........................................................................................................................... 3

2Getting Started..................................................................................................................... 4

3Hardware Description........................................................................................................... 4

3.1 Hardware Architecture ......................................................................................................... 4

3.2 Power Supply....................................................................................................................... 5

3.3 UART/ I2C Interface ............................................................................................................. 5

3.4 LEDs .................................................................................................................................... 6

3.5 Others .................................................................................................................................. 7

4Software Description............................................................................................................ 7

5AS726x-iSPI Schematics..................................................................................................... 8

6Ordering & Contact Information ........................................................................................... 9

7Copyrights & Disclaimer.....................................................................................................10

8Revision Information ..........................................................................................................11

AS726x-iSPI

Evaluation Kit User Guide

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1 Introduction

AS726x-iSPI Evaluation Kit provides a platform to evaluate ams AS726x products with AS726x

Spectral Sensing –iSPI software running on Windows based personal computer. This user guide

describes the features and functions of AS726x-iSPI evaluation kit.

1.1 Kit Content

The following items are delivered with this Demo Kit.

Pos.

Item

Comment

AS726x-iSPI Board

Evaluation Board

USB Memory Stick

Documents and Software

Cable

FTDI USB-MPSSE Cable

Figure 1. Kit Content

1.2 Connection

Figure 2. AS726x-iSPI and Cable Connection

J2’s Pin 1 (the pin with square pad) needs to be connected to Red wire of the cable.

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2 Getting Started

The evaluation kit requires one time installation of FTDI CDM Driver for the USB-MPSSE cable if it

is not already installed on the computer. The installation file can be found in the USB Memory Stick.

If there is an issue about the installations, please refer to www.ftdichip.com for more information.

The AS726x Spectral Sensing –iSPI software does not need extra installation. Please copy the

following files to any folder you would like to work with and run the .exe file to start the GUI.

File

Comment

AS726x_Spectral_Sensing_iSPI_GUI.exe

Excutable file

FTD2XX_NET.dll

DLL file

Figure 3. AS726x Spectral Sensing –iSPI GUI Software Files

3 Hardware Description

The AS726x-iSPI design consists of AS726x device with associated flash memory, LED circuit, and

jumper configuration for UART/I2C interface.

3.1 Hardware Architecture

AS726x

flash

6 Pin

Header

3V3

SPI

I2C/UART

AS726x-iSPI

GUI

USB-MPSSE Cable

AS726x-iSPI

Module LEDs

Jumper

Figure 3. Board Block Diagram

AS726x-iSPI

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Pos.

Designator

Comment

AS726x Device

J3, J4

Headers for UART or I2C interface Selection;

D6, D7

Place Holders for LEDs;

Six Pins Header; Connect to PC with USB-MPSSE cable;

Test Point for External Supply for LEDs;

Flash memory;

Figure 4. Devices, Connectors and LEDs

3.2 Power Supply

The AS726x-iSPI module is powered by FTDI C232HM-DDSHL-0 USB-MPSSE cable that connects

to a personal computer. The voltage of the supply is 3.3V.

3.3 UART/ I2C Interface

AS726x device supports either UART or I2C interface as the communication path. By default,

AS726x-iSPI demo kit is shipped as using I2C interface. AS726x Spectral Sensing iSPI GUI

software can be used to evaluate AS726x features.

If the UART interface is desired, please adjust the jumper setting as below. Any terminal software

configured as 115200 Baud Rate, 8-Bit Data, No Plarity, 1-Bit Stop would be fine.

UART Interface

OFF

I2C Interface

OFF

Figure 5. Jumper Setting

Please note that you may need to reset the USB-MPSSE cable by plug-out/plug-in when you switch

UART and I2C interface during your evaluation.

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3.4 LEDs

AS726x-iSPI module has two place holders for LED light sources. By default there are no LEDs

populated onboard.

100nF

RX / SCL_S

GND

LED_DRV

SCK

CSN_EE

MISO

MOSI

VDD1 VDD2

AS726x

10uF

TX / SDA_S LED_IND

Flash

6-channel

NIR

Sensor

Light

Source

Light in Target

Reflective

Surface

INT

Figure 6. Generic Application

A generic application of AS726x is to shine light rays to a target and AS726x produces outputs

based on the reflected light rays as Figure 6. So LED selection is determined by the spectral

responsivity of reflected light and characteristics of the target. For example, if the target is expected

to absorb 680nm light and the application needs to distinguish the target from others, a broadband

white LED might be used as the light source with AS7263 and the 680nm channel should be

checked. Various applications may require different light sources.

LEDs can be powered either by onboard 3.3V rail or by an external supply. If 3.3V rail is used,

please populate LEDs on D6/D7 and install a zero ohms resistor on R5. If 3.3V supply is not high

enough for some higher forward voltage LEDs, an external supply can be connected to the test

point, V and the current limit resistor R11 should be installed. Please note that R5 has to be

removed when connect external supply to the module.

The AS726x can drive LEDs with 12.5mA, 25mA, 50mA, or 100mA. There is also an indicator LED,

D5, onboard. The LEDs can be controlled and configured with the vitual I2C register, 0x07 (the

Addr: 0x07/0x87

LED Control

Bit

Bit Name

Default

Access

Bit Description

7:6

RSVD

Reserved

5:4

ICL_DRV

R/W

LED_DRV current limit

‘b00=12.5mA; ‘b01=25mA; ‘b10=50mA;

‘b11=100mA;

LED_DRV

R/W

Enable LED_DRV

1: Enabled; 0: Disabled

2:1

ICL_IND

R/W

LED_IND current limit

‘b00=1mA; ‘b01=2mA; ‘b10=4mA; ‘b11=8mA;

LED_IND

R/W

Enable LED_IND

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Addr: 0x07/0x87

LED Control

1: Enabled; 0: Disabled

Figure 7. Register for LED Configuration

For UART interface, AT command ATLED1 = 100/0 to turn the LEDs D6/D7 ON/OFF and ATLEDC

= 0xXY (one byte) configures the LED current. X sets the LED current and Y configures the

indicator LED current. ATLED0 and ATLEDC controls/configures the indicator LED, D5.

AT Commands

LED (D6/D7)

LED (D5)

ATLED0 = 100/0

ON/OFF

ATLED1 = 100/0

ON/OFF

ATLEDC = 0xXY

Set LED Current

X = 0000b, Y = 0000b

12.5mA

1mA

X = 0001b, Y = 0001b

25mA

2mA

X = 0010b, Y = 0010b

50mA

4mA

X = 0011b, Y = 0011b

100mA

8mA

Figure 8. AT Commands for LED Control

When ever the board is powered, the LED should be on for a short time and off. If the LED keeps

flashing, it implys something wrong in the communication between AS726x device and the flash

memory.

3.5 Others

AS726x-iSPI module can be wired to customer controller for development/evaluation. The test

points, SDA/SCL, can be used for monitoring UART/I2C bus transaction. Also pin 6 of J2 provides

the connection to INT. If interrupt is required to get the sensor data, this pin will be convienient for

watching interrupt signal.

4 Software Description

This evaluation kit comes with the Spectral Sensor dashboard software running on a Windows

computer for evaluating AS726x features. The USB Data Stick has the application notes for the

Spectral Sensor software. Please refer to the document for more information to use the software.

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5 AS726x-iSPI Schematics

AS726x-iSPI

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6 Ordering & Contact Information

Ordering Code

Description

Demo/Eval Kit AS726x-iSPI

AS726x-iSPI Evaluation Kit

Buy our products or get free samples online at:

www.ams.com/ICdirect

Technical Support is available at:

www.ams.com/Technical-Support

Provide feedback about this document at:

www.ams.com/Document-Feedback

For further information and requests, e-mail us at:

ams_sales@ams.com

For sales offices, distributors and representatives, please visit:

www.ams.com/contact

Headquarters

ams AG

Tobelbaderstrasse 30

8141 Unterpremstaetten

Austria, Europe

Tel: +43 (0) 3136 500 0

Website: www.ams.com

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7 Copyrights & Disclaimer

translated, stored, or used without the prior written consent of the copyright owner.

Demo Kits, Evaluation Kits and Reference Designs are provided to recipient on an “as is” basis for

demonstration and evaluation purposes only and are not considered to be finished end-products

intended and fit for general consumer use, commercial applications and applications with special

requirements such as but not limited to medical equipment or automotive applications. Demo Kits,

Evaluation Kits and Reference Designs have not been tested for compliance with electromagnetic

compatibility (EMC) standards and directives, unless otherwise specified. Demo Kits, Evaluation Kits

and Reference Designs shall be used by qualified personnel only.

ams AG reserves the right to change functionality and price of Demo Kits, Evaluation Kits and

Reference Designs at any time and without notice.

Any express or implied warranties, including, but not limited to the implied warranties of

merchantability and fitness for a particular purpose are disclaimed. Any claims and demands and any

direct, indirect, incidental, special, exemplary or consequential damages arising from the inadequacy

of the provided Demo Kits, Evaluation Kits and Reference Designs or incurred losses of anykind (e.g.

loss of use, data or profits or business interruption however caused) as a consequence of their use

are excluded.

ams AG shall not be liable to recipient or any third party for any damages, including but not limited to

personal injury, property damage, loss of profits, loss of use, interruption of business or indirect,

special, incidental or consequential damages, of any kind, in connection with or arising out of the

furnishing, performance or use of the technical data herein. No obligation or liability to recipient or

any third party shall arise or flow out of ams AG rendering of technical or other services.

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