User`s guide

Make sure the power supply is compatible with the chip requirements.
QT300
If the Synchronization input is used, a 1K resistor should be used to avoid problems
with the cloning process; see figure below.
QT310
Place the connector as close as possible to the chip. Placing the cloning connector far
from the part will increase sensor load capacitance Cx and decrease sensitivity, as
some of the cloning lines are also sense lines. Long distances on cloning lines can
also make the clone process more susceptible to communication errors from ringing
and interference, and create an RF antenna for external fields.
QT320/QT310
Clone Connector Design Rules
Care must be taken when designing an onboard cloning connector. The following are a few requirements
needed for a successful cloning connector design.
Figure 3 - QT310 Clone Connections
9 QTM300CA/R1.01 07/02
GND
8
Vdd
Vcc
Out
/SDI
SDI
SCK
SIN
SOUT
4
6
Sout
1
5
7
SENSOR 1
CAL /LATCH
CAL
LATCH
2
Sin
/SDO
3
OUT
CS
GND
SDO
S1b
S1a
/SCK