AT42QT5320 Datasheet, PDF (4/8 Pages) ATMEL Corporation – Patented charge-transfer (transverse mode)

1.3 Schematic
Figure 1-1. Typical Circuit
Follow regulator manufacturer's recommended values
for input and output bypass capacitors (Creg).
Vunreg
VREG
VDD
Creg
Creg
VDD
Rp Rp
SDA
I2C
SCL
CHANGE
VDD
Rp
TRIGGER
FORCE SENSOR
ADDRESS SELECT
QT5320
Add two 100nF capacitors: one close to pins 4 and 6,
and another close to pins 18 and 20.
Rx7
Rx6
Rx5
Rx4
Rx3
Rx2
Rx1
Rx0
Ry0
Cs0
Ry1
Cs1
Ry2
Cs2
Ry3
Cs3
Rs3 Rs2 Rs1 Rs0
Suggested regulator manufacturers:
• Torex (XC6215 series)
• Seiko (S817 series)
• BCDSemi (AP2121 series)
NOTES:
1) The central pad on the underside of the chip
is a Vss pin and should be connected to ground.
Do not put any other tracks underneath
the body of the chip.
2) It is important to place all Cs, Rs, Rx and Ry
components physically near to the chip.
3) Leave YnA, YnB unconnected if not used.
4 QT5320
9509AS–AT42–10/08