sx8644 Semtech Corporation, sx8644 Datasheet - Page 34

• Manufacturer Part Number: sx8644
• Description: Ultra Low Power, Capacitive Button And Slider Touch Controller 12 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
SCL
The SCL pin is a high impedance input pin. The SCL pin is protected to VDD, using dedicated devices, in order to
conform to standard I2C slave specifications. The SCL pin has diode protected to GROUND.
An external pull-up resistor (1..10 kOhm) is required on this pin.
Figure 38 shows the simplified diagram of the SCL pin.
SDA
SDA is an IO pin that can be used as an open drain output pin with external pull-up resistor or as a high
impedance input pin. The SDA IO pin is protected to VDD, using dedicated devices, in order to conform to
standard I2C slave specifications. The SDA pin has diode protected to GROUND.
An external pull-up resistor (1..10 kOhm) is required on this pin.
Figure 39 shows the simplified diagram of the SDA pin.
Revision 7_3, January 10
from host
from/to host
R_SCL
R_SDA
VDD
VDD
Figure 39
Figure 38
Touch Controller (12 sensors) with Enhanced LED Drivers
© 2009 Semtech Corp.
Simplified diagram of SDA
Simplified diagram of SCL
SX8644
SX8644
SCL
SDA
34
Ultra Low Power, Capacitive Button and Slider
SCL_IN
SDA_OUT
SDA_IN
DATASHEET
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SX8644