QT60326-ASG Atmel, QT60326-ASG Datasheet - Page 30

• Manufacturer Part Number: QT60326-ASG
• Description: IC SENSOR QMATRIX 32CHAN 44TQFP
• Manufacturer: Atmel
• Series: QMatrix™, QProx™r
• Type: Capacitiver

Specifications of QT60326-ASG

• Number Of Inputs/keys: 32 Key
• Resolution (bits): 9, 11 b
• Data Interface: Serial, SPI™, UART
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 25mA
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Output Type: Logic
• Interface: UART, SPI
• Input Type: Logic
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 427-1109

7.3 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.
7.4 PCB Layout
Shown is an example 32-key PCB layout using inexpensive 1-sided CEM-1 or FR-1 PCB laminate. The key layouts follow the
design rules of Figure 2-6 (page 5) and as shown above.
lQ
30
X
QT60486-AS R8.01/0105
Y
Y
0-ohm SMT Jumper
X