QT60168-ASG QUANTUM ATMEL, QT60168-ASG Datasheet - Page 27

• Manufacturer Part Number: QT60168-ASG
• Description: IC, 16, 24 KEY QMATRIX SENSOR, TQFP-32
• Manufacturer: QUANTUM ATMEL

Specifications of QT60168-ASG

• Supply Current: 25mA
• Ic Interface Type: Serial, SPI
• Supply Voltage Range: 3V To 5.25V
• Sensor Case Style: TQFP
• No. Of Pins: 32
• Operating Temperature Range: -40°C To +105°C
• Termination Type: SMD
• Ic Function: 16, 24 KEY QMATRIX
• Digital Ic Case Style: TQFP
• Operating Temperature Max: 105°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.2 1-Sided Key Layout
This key design can be made on a 1-sided SMT PCB. A single 0-ohm jumper
allows the wiring to be done on a single side with full pass-through of X and Y
traces to allow matrix connections to be made across a large number of keys.
Key size, shape, and number of interleavings can be varied substantially from
this drawing. The below drawing shows 6 interleave white spaces; only a
double interleave is required in the case of smaller keys.
The PCB is bonded to a panel on its underside, and the fields fire through the
PCB, adhesive, and panel in that sequence. This results in a very low cost
design.
7.3 PCB Layout
Shown is an example PCB layout using inexpensive 1-sided CEM-1 or FR-1 PCB laminate. The key layouts follow the design
rules shown above. (PCB design shown uses a QT60326 chip but still represents a good example).
lQ
27
X
QT60248-AS R4.02/0405
Y
Y
0-ohm SMT Jumper
X