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PDF IQS128L Data sheet ( Hoja de datos )
| Número de pieza | IQS128L | |
| Descripción | Touch Controller | |
| Fabricantes | Azoteq | |
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IQ Switch® ProxSense® Series
IQS128 / IQS128L Datasheet
IQ Switch® - ProxSense® Series
Single Channel Capacitive Proximity/Touch Controller
The IQS128 / IQS128L ProxSense® IC is a fully integrated capacitive sensor implementing
Dynamic Calibration (DYCAL™) technology: intelligent hysteresis to allow for sensor drift even
during sensor activation.
Features
IQS128 TSOT23-6
DYCAL™ : Intelligent Hysteresis
Internal Capacitor Implementation (ICI) – reference
capacitor on-chip
Automatic Tuning Implementation (ATI) -
IQS128L DFN8 (2x3)
Automatic adjustment for optimal sensor performance
Supply voltage: 2.95V to 5.5V
Minimum external components
1-Wire open drain data streaming option
Advanced on-chip digital signal processing
User selectable (OTP):
External synchronisation control or
External control over filter operation
I/O Sink or Source selection
Time-out for stuck key
Proximity and Touch sensitivity selections
IQS128L: Low Power options available
Keys:
Dielectric:
Touch:
Proximity:
Material:
Thickness:
5mm x 5mm or larger (overlay thickness dependent)
Various electrical options (wire / PCB trace / ITO / conductive foil)
Various non-metal materials (i.e. glass, plastic, painted surfaces)
6 mm plastic, 10 mm glass for touch. Very thick overlay possible for proximity
Applications
Occupancy sensors
SAR qualification for Tablet PC’s
On-ear detection for mobile phones
3D glasses
Personal Media Players
White goods and appliances
Advantages
Allows for sensor drift in periods of
activation and non-activation
Improved digital filtering to reduce
external noise
Human Interface Devices
Proximity activated backlighting
Any applications where a touch and
proximity condition can prevail for an
extended period of time with or
without a host controller
Minimal power consumption (<7µA)
when in standby mode (Charge Halt).
Available Options
TA
-40°C to 85°C
TSOT23-6
IQS128
DFN8 (2x3)
IQS128L
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS128 & IQS128LP Datasheet v2.4
Page 1 of 33
November 2012
Free Datasheet http://www.datasheet4u.com/
1 page  
IQ Switch® ProxSense® Series
2 Pin-Out
The IQS128 is available in a TSOT23-6 package and the IQS128L is available in a DFN8(2x3)
package.
2.1 IQS128
2.1.1 Pin-out
OUT 1
6 CX
VSS 2
5 VDDHI
CTRL / ND 3
4 VREG
Pin Name
1 OUT
2 VSS
3 CTRL / ND
4 VREG
5 VDDHI
6 CX
Figure 2.1 Pin-out of IQS128 package
Table 2.1 Pin-out description
Type
Digital Out
Ground
Digital Input/Output
Analogue Output
Supply Input
Analogue
IQS128
Function
Output
GND Reference
Control input or proximity output / ND pin
Internal Regulator Pin (Connect 1µF bypass capacitor)
Supply Voltage Input
Sense Electrode
2.1.2 Schematic
IQS128
VDDHI
VDDHI
CVDDHI
CX
CTRL/ND
RCX
VDDHI
Sense
Electrode
CTRL
Input/Output
VSS
OUT
VREG
RPU
Output
CVREG
GND
GND
Note: A 100pF capacitor can be places in parallel with
the existing capacitors between VDDHI and GND as
well as between VREG and GND for added RF
immunity.
Figure 2.2 Typical application schematic of
IQS128
2.1.3 Typical values
Component
Value
CVREG
RCX
RPU*
CVDDHI
1uF
470 Ω (typical)
4.7 kΩ (typical)
1uF
* RPU is only needed if device is setup
in active Low state.
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS128 & IQS128LP Datasheet v2.4
Page 5 of 33
November 2012
Free Datasheet http://www.datasheet4u.com/
5 Page 
IQ Switch® ProxSense® Series
4 Measuring capacitance using the Charge Transfer method
The charge transfer method of capacitive
sensing is employed on the
IQS128/IQS128L. (The charge transfer
principle is thoroughly described in the
application note: “AZD004 - Azoteq
Capacitive Sensing”.)
A charge cycle is used to take a
measurement of the capacitance of the
sense electrode (connected to Cx) relative to
ground. It consists of a series of pulses
charging Cx and discharging Cx to the
reference capacitor, at the charge transfer
frequency (FCX - refer to Section 10). The
number of the pulses required to reach a trip
voltage on the reference capacitor is referred
to as counts (CS) which is the
instantaneous capacitive measurement. The
CS value is used to determine if either a
physical contact or a proximity event has
occurred based on the change in CS
detected. The typical values of CS, without a
touch or a proximity condition range between
1344 and 1865, although higher and lower
CS can be used based on the application
tSAMPLE
tCHARGE
requirements. With CS larger than +/-1865
the gain of the system may become too high
causing unsteady CS.
The IQS128/IQS128L schedules a charge
cycle every tSAMPLE seconds to ensure
regular samples for processing of results.
The duration of the charge cycle is defined
as tCHARGE and varies according to the CS
required to reach the trip voltage. Other
activities, such as data streaming (if device is
in streaming mode), are completed between
charge cycles.
Please note: Attaching a probe to the Cx
pin will increase the capacitance of the
electrode and therefore the CS. This may
have an immediate influence on the CS
(decrease tCHARGE – thus CS) and cause a
proximity or a touch event. After tHALT
seconds the system will adjust to
accommodate for this change. If the total
load on Cx, with the probe attached is still
lower than the maximum Cx load the system
will continue to function normally after tHALT
seconds with the probe attached.
Cx pin
1234
tLP_CHARGE
Figure 4.1 Charge cycles as can be see on CX
tLP
Cx pin
123
Figure 4.2 Charge cycles as charged in LP modes (IQS128L only)
Copyright © Azoteq (Pty) Ltd 2011
All Rights Reserved
IQS128 & IQS128LP Datasheet v2.4
Page 11 of 33
November 2012
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet IQS128L.PDF ] | |
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