qt1100a Quantum Research Group, qt1100a Datasheet - Page 8

• Manufacturer Part Number: qt1100a
• Description: 10 Key Qtouch? Sensor Ic
• Manufacturer: Quantum Research Group

Table 1.5 Pin Descriptions
LQ
LED/STAT
RX/WAKE
SCANO_x
SCANI_x
CMODE
SNSnK
DOEE
CRDY
SYNC
SNSn
CKEE
CSEE
OSC1
OSC2
DIEE
/RST
Pin
CLK
/SS
DO
TX
DI
Description
Sense pin, to Cs reference capacitor
Sense pin, to Cs and to key electrode
Clock line output, to drive serial EEPROM
Output data line, to serial EEPROM
Input data line, from serial EEPROM
Serial port pin for UART
Receive pin in UART mode; alternately or in addition, Wake from sleep
Serial interface handshake pin; bidirectional in UART mode, output only in SPI
mode. Always use a pull-up resistor on this pin.
Chip select drive to serial EEPROM. Always use a pull-down resistor on this pin.
SPI clock input from host
SPI data output to host. Always use a pull -up resistor on this pin.
SPI data in from host
SPI Slave select from host
Output scan lines
Input scan lines
Communications mode select pin. For UART or scanport operation, connect to
Vss. For SPI mode, connect to Vdd.
Sync Input to synchronize acquisitions to an external source or another QT chip.
Always use a pull-up resistor on this pin.
LED & Status output pin. This pin can sink 1mA to drive a status LED, or be used
by a host controller to determine device error condition or status .
Reset input, low resets device. Normally this pin can be tied to Vdd, or driven from
a host controller.
Connect to 12MHz resonator; can also be an external clock input
Connect to 12MHz resonator; leave open if external clock is used
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Copyright © 2003-2005 QRG Ltd
QT1100A-ISG R3.02/1105