AMS AS7225 Benutzerhandbuch - Seite 7

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AS7225

Director Demo Kit User Guide

6. Wait until the update is done.

3.4.3 External MCU Connection

AS7225 demo board allows onboard MCU to be suspended and an external MCU can be

connected to the board to control AS7225 device and/or onboard LEDs. This would minimize the

hardware development time and test AS7225 in a real application.

The onboard MCU can be suspended either by installing a 0Ω resistor on R70 or by pulling EDD

signal to LOW. The EDD signal is connected to pin8 of onboard MCU and pin7 of J3. The external

MCU could pull the EDD to LOW to suspend onboard MCU. Then the external MCU can control

AS7225 through I

C bus on J3 as well as onboard LEDs with PWM/FB signals on J3/J2. Extra

sensors can be added via the I

3.5

There are six LED strings on AS7225 demo board. Each LED string has three LEDs in serial and it

is controlled by a pai of MOSFETs. PWM and FB signals are used by the MCU to control the

current through the LEDs.

4.1

The demo kit comes with AS7225 Evaluation User Interface software running on a Windows

computer for evaluating AS7225 features. Please refer to the application note in the USB Data Stick

for how to use the software.

4.2

The host MCU supports UART interface with AT commands to communicate to AS7225. The AT

commands can be used to configure AS7225. There are also some commands can be used for the

host MCU configuration.

Any Windows terminal application would be good for sending the commands. A freeware, Putty.exe

as an example, can be downloaded form the internet. The comm port configuration should be

115200 Baud Rate, 8-Bit Data, No Plarity, 1-Bit Stop.

Command

Status

ATVERSW

ams Demo Kit Manual

[v2-00] 2018-Jun-08

Figure 6. Firmware Update

C bus on J5.

Response

AS7225 AT Commands

NOP

Return the current software version number

Description / Parameters

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