SX9500 Datasheet, PDF (1/31 Pages) Semtech Corporation – Ultra Low Power, Capacitive Four (4) - Channel Proximity/Button

WIRELESS & SENSING
GENERAL DESCRIPTION
SX9500
Ultra Low Power, Capacitive
Four (4) - Channel Proximity/Button
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KEY PRODUCT FEATURES
The SX9500 is a low-cost, very low power 4-channel
capacitive controller that can operate either as a proximity
or button sensor. The SX9500 includes sophisticated on-
chip auto-calibration circuitry to regularly perform sensitivity
adjustments, maintaining peak performance over a wide
variation of temperature, humidity and noise environments,
providing simplified product development and enhanced
performance.
A dedicated transmit enable (TXEN) pin is available to
synchronize capacitive measurements for applications that
require synchronous detection, enabling very low supply
current and high noise immunity by only measuring
proximity when requested.
The SX9500 operates directly from an input supply voltage
of 2.7 to 5.5V, and includes a separate I2C serial bus
supply input to enable communication with 1.8 – 5.5V
hosts. The I2C serial communication bus reports proximity
or touch detection and is used to facilitate parameter
settings adjustment. Upon a proximity detection, the NIRQ
output asserts, enabling the user to either determine the
relative proximity distance, or simply obtain an indication of
detection. The serial bus can also serve to overwrite
detection thresholds and operational settings in the event
the user wants to change them from their factory presets.
2.7 – 5.5V Input Supply Voltage
Capacitive Sensor Inputs
4 fF Capacitance Resolution
Stable Proximity & Touch Sensing With Temperature
Capacitance Offset Compensation to 30pF
Active Sensor Guarding
Automatic Calibration
Ultra Low Power Consumption:
Active Mode:
Doze Mode:
Sleep Mode:
170 uA
18 uA
2.5 uA
400KHz I2C Serial Interface
Four programmable I2C Sub-Addresses
Input Levels Compatible with 1.8V Host Processors
Open Drain NIRQ Interrupt pin
Three (3) Reset Sources: POR, NRST pin, Soft
Reset
-40°C to +85°C Operation
Compact Size: 3 x 3mm Thin QFN package
Pb & Halogen Free, RoHS/WEEE compliant
APPLICATIONS
• Notebooks
• Tablets
• Mobile Appliances
ORDERING INFORMATION
Semtech P/N
Package
SX9500IULTRT ^Note1
QFN-20
SX9500EVK
Eval. Kit
Note 1: Quantities are ordered in 3K units per Reel
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TYPICAL APPLICATION CIRCUIT
Figure 1: Typical Application Circuit
Revision 1.6 June 27, 2012
© 2012 Semtech Corporation
1
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