UM1545 datasheet(41/64 Pages) STMICROELECTRONICS

41 / 64 page

UM1545

F.A.Q.s

Doc ID 023225 Rev 1

41/64

Q: "I'm not comfortable with hexadecimal notation when editing the coefficient values in the

control panel. Can I use the floating point one?"

A: Of course: uncheck Show Values in Hexadecimal in the preference window and

you'll be able to enter the values in decimal notation. Please be aware that the floating

point notation implies a long number of significant decimal digits that cannot be

displayed all at once. As a result some digits might be hidden from view but can be

easily displayed by highlighting the whole number with the mouse. Please remember

that the coefficients range is from -1 to 1.

Q: "The reset pulse length applied by default using the RESET command in the script does

not fit my needs. Can I set a different value?"

A: "There's no direct way to change the reset pulse length in a script. However, the

reset procedure can be manually executed using the SET_RST command to move the

reset line. Just use the following syntax:

The reset pulse will now last 200 milliseconds. This value can be changed as needed.

Q: "I want to add a note in the log to mark a section of interest for my work. How do I do

that?"

A: Follow this procedure:

1. Press the Add Note button in the Log Viewer window.

2. Write the note and press enter. The note will be immediately displayed.

4.2

Problems

Q: "The device does not respond to the APW controls"

A: The possible causes are:

a. The device might be in standby.

b. The device may need to be initialized.

c. The Auto Apply option is unchecked.

Q: "I do not get any I2C failure message, but I keep reading 00h or FFh. What's wrong?"

A: The possible causes are:

a. The interface board is not properly connected to the ST Sound Terminal® device

board.

b. The interface board is not correctly powered.

filter. What's wrong?"

A: The possible causes are:

a. The Disable auto-scaler option is selected and one of the coefficients is out of

range.

b. One filter might be unstable and to avoid dangerous effects it is not applied to

the device.

SET_RST 0

# set RESET line at 0 (low_level)

P 200

# pause 200 ms

SET_RST 1

# set RESET line at 1 (high level)

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