QT60240-ISG QUANTUM ATMEL, QT60240-ISG Datasheet - Page 24

• Manufacturer Part Number: QT60240-ISG
• Description: QPROX SENSOR 24 KEYS, SMD, MLF-32
• Manufacturer: QUANTUM ATMEL

Specifications of QT60240-ISG

• Supply Voltage Range: 1.8V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: MLF
• No. Of Pins: 32
• Operating Temperature Max: 85°C
• Operating Temperature Min: -40°C
• Package /: RoHS Compliant
• Ic Function: 16, 24 KEY QMATRIX Touch Sensor
• Rohs Compliant: Yes

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)