Quantum QTM300CA - Manual (Page 9)

If the Synchronization input is used, a 10K resistor should be used to avoid problems
with the cloning process; see Figure 4 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 - QT300 Clone Connections
Vcc
s
SDI SCK
Vss
Vdd
SCK
4
6
SCK
2
5
3
SDO
REQ
DRDY
10K 10K
Vdd Vdd
GND SDO
SDO
7
REQ
1
DRDY
8
C
10K 10K
SNS1 Electrode
SNS2
Figure 4 - QT310 Clone Connections
8
s
VSS
Vdd
VDD
OUT
SDI SCK
/SYNC_I
/SYNC_O
4
6
/SYNC_I
/SYNC_O
1
5
7
Electrode
/CAL
2
/CAL
3
C
GND SDO
SNS2
SNS1
10K
OUT
l q
9 QTM300CA/R1.02 25.09.03