E6240 Atmel, E6240 Datasheet - Page 9

• Manufacturer Part Number: E6240
• Description: KIT EVAL/DEV USING QT60240-ISG
• Manufacturer: Atmel
• Series: Quantum, QMatrix™r

Specifications of E6240

• Sensor Type: Touch, Capacitive
• Sensing Range: 16 / 24 Buttons/Keys
• Interface: I²C, USB
• Voltage - Supply: 5V
• Embedded: No
• Utilized Ic / Part: QT60160, QT60240
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Sensitivity: -

the keys. The changes
keys, press and hold
CTRL and then click
changes to all keys
Click here to make
To select multiple
3.3
3.3.1
3.3.2
will apply to all
selected keys
Key number
QmSettings Dialog Box
Introduction
For more information about the parameters refer to the QT60160/QT60240 datasheet. From the
Menu bar click View, Key Settings to open the QmSettings dialog box. This allows the IC to be
modified. There are three tabs:
Figure 5: QmSettings Dialog Box – Key Settings
Key Settings
If the dialog box does not open in the Key Settings view then click the Key Settings tab (see
Figure 5). The default settings show NTHR and BL (with no tabs at the bottom of the dialog box).
To see the full list of settings and the tabs click Options, QmSettings, Advanced.
NTHR – Negative Threshold is used to adjust the sensitivity of a key. Higher values make keys
less sensitive, lower values make keys more sensitive.
NDRIFT – Negative Drift is the rate at which drift compensation is carried out for a negative going
signal (when a key is touched or receives increased loading). The value is seconds/reference level.
PDRIFT – Positive Drift is the rate at which drift compensation is carried out for a positive going
signal (when a key is touched or receives increased loading). The value is seconds/reference level.
NDIL – Negative Detection Integrator Limit allows enabling and disabling of keys and provides
signal filtering. Higher values provide more filtering but increase the response time of the key.
FDIL – Fast Detection Integrator Limit provides filtering but has less effect on response time.
Total filtering is a combination of NDIL multiplied by FDIL.
NRD – Negative Recalibration Delay determines the maximum time a key can be active before
being automatically recalibrated by the IC. The value is in seconds.
BL – Burst Length modifies key sensitivity. Higher values make the key more sensitive, lower
values make it less sensitive. The correct sensitivity for a key should be achieved with BL and
NTHR. Generally, BL should be as low as possible and NTHR should range from 7 to 12.
•
•
•
(for individual keys)
Key Settings: to change the individual key parameters
Global Settings: to change the global parameters
Logging: to select which keys’ parameters will be logged
Key Settings
Global Settings
(for all keys)
E6240 User Manual
(for recording data)
9 of 17
Logging
Key settings
(Section 3.3.2)
Value becomes
bold when changed