E6240 Atmel, E6240 Datasheet - Page 24
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E6240
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
-
7.5 Power Consumption
The formula to find the average current is:
Example: Conditions: Vdd = 1.8V, 10 keys BL = 32, 14 keys BL = 16, Tsleep = 125ms
lQ
Where:
Idd
Idds
Tsleep
Iddr
T
KE
1
BS
if more than one burst spacing is used then each must be
included in the calculation.
Idd = (current sleeping x sleep period) + (current running x (burst spacing x number of keys enabled))
Idd = (Idds x Tsleep) + (Iddr x (T
Idd = (0.003 x 125) + (1.02 x ((0.38 x 10) + (0.27 x 14))) = 0.06115mA = 61.15µA
=
=
=
=
=
=
average current (mA)
current when sleeping
sleep period
current when running
burst spacing
number of keys enabled
Tsleep + (T
Test condition: BL = 48, 16 or 24 keys enabled (see appropriate column)
125 + ((0.38 x 10) + (0.27 x 14))
Voltage (V)
(
sleep period + (burst spacing x number of keys enabled)
1
ms
Table 7.1 Average Current Consumption
(ms)
BS
1.8
3.3
5.0
1.8
3.3
5.0
1.8
3.3
5.0
1.8
3.3
5.0
1.8
3.3
5.0
1.8
3.3
5.0
1.8
3.3
5.0
1.8
3.3
5.0
)
x KE)
(
mA
(
BS
mA
1
x KE))
)
)
Setting (ms)
Sleep
1000
2000
125
250
500
(Section 7.3)
(Table 6.2)
(Section 7.3)
(Section 7.4)
16
32
64
24
Note: there may be more than one inst ance of (T
24 keys
(see example below)
Idd Typical (mA)
0.480
1.050
1.900
0.300
0.670
1.220
0.170
0.350
0.730
0.090
0.220
0.400
0.050
0.120
0.240
0.043
0.090
0.160
0.040
0.080
0.130
0.039
0.075
0.120
16 keys
0.360
0.840
1.550
0.250
0.540
0.910
0.150
0.310
0.550
0.080
0.170
0.300
0.048
0.100
0.160
0.040
0.060
0.110
0.038
0.053
0.100
0.037
0.050
0.095
QT60240-ISG R8.06/0906
BS
x KE)