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PDF ( 数据手册 , 数据表 ) IQS253

零件编号 IQS253
描述 Capacitive Sensor
制造商 Azoteq
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IQS253 数据手册, 描述, 功能
IQ Switch®
ProxSense® Series
IQS253 Datasheet - Configurable 3 Channel DYCALTM
Capacitive Sensor with Automatic Compensation for
Sensitivity Reducing Objects
Unparallelled Features:
J DYCALTM: Intelligent Hysteresis
J Internal Capacitor Implementation (ICI) - Reference capacitor on-chip
J Automatic Tuning Implementation (ATI) - Automatic adjustment for optimal sensor performance
The IQS253 ProxSense® IC is a fully integrated capacitive sensor implementing Dynamic Cali-
bration (DYCALTM) technology: intelligent hysteresis to allow for sensor drift even during sensor
activation.
Main features:
J Self or Projected Technology sensors
J 3 Channels configurable as DYCALTM /Normal output
J Self: Boolean direct output configurable through I2C
J Supply voltage: 1.8 V to 3.6 V
J Internal voltage regulator
J Advanced on-chip digital signal processing
J I2C adjustable settings
• DYCALTM settings
• Control over filter operation
• Time-out for stuck key
• Proximity and Touch sensitivity selections
• Low Power options
• Event Mode possible (only communicates if an event is detected)
Applications:
J Occupancy sensors
J SAR complient sensors for Tablet PC’s
J On-ear detection for mobile phones
J 3D glasses
J Personal Media Players
J Any applications where a touch and proxim-
ity condition can exist for a extended pe-
riod of time
Advantages:
J Allows for sensor drift in periods of activation
and non-activation
J Improved digital filtering to reduce external
noise
J Remote Control Sleep implementation
J Gaming Controllers
J Highly adjustable I2C device which only in-
terrupts (Event Mode) when an event is
detected
J Proximity activated backlighting
Copyright ©
IQS253 Datasheet V1.04
Azoteq
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IQS253 pdf, 数据表
IQ Switch®
ProxSense® Series
4 Packaging and Pin-Out
The IQS253 IC is available in the MSOP-10 and DFN-10 package. The pin-outs of the self and
projected setup differ with the transmitter (CTX) on the projected configuration being configured as
a Boolean output (B_OUT) on the self configuration.
GND
CX0
CX1
VDDHI
VREG
B Out/
CTX
CX2
SCL
SDA
RDY/
ND
Figure 4.1: IQS253 Pin Out.
4.1 IQS253 Self Capacitance
4.1.1 Pin-out
Table 4.1: IQS253 Self Capacitive Pin-out
Pin Name
Type
Function
1 GND
Supply Input
Ground Reference
2 CX0
Analogue
Sense Electrode 0
3 CX1
Analogue
Sense Electrode 1
4 VDDHI
Supply Input
Supply Voltage Input
5 VREG
Analogue Output
Internal Regulator Pin (Connect 1 µF bypass capacitor)
6 RDY/ND Digital Out / Analogue In
I2C: RDY Data indication Output / ND pin
7 SDA
Digital I/O
I2C: Data Input / Output
8 SCL
Digital Input
I2C: Clock Input
9 CX2
Analogue
Sense Electrode 2
10 B_OUT
Digital Output
Boolean Output (Open Drain - Requires pull-up resistor)
Copyright ©
Azoteq
IQS253 Datasheet V1.04
8of 53







IQS253 equivalent, schematic
IQ Switch®
ProxSense® Series
7.3 Report Rate
7.8 Counts
The report rate of the device depends on the
charge transfer frequency, the number of chan-
nels enabled and the length of communications
performed by the master device.
Capacitive measurements are available in these
registers. The data has an AC noise filter ap-
plied, which helps the device to work in very
noisy environments. The filter is default en-
abled.
7.4 Active Channels
The user has the option to disable channels.
This can be done in the ACTIVE_CHAN regis-
ter. All 3 channels are enabled by default.
7.5 DYCALTM or Direct Output
7.8.1 Disabling AC Noise Filter
The AC noise filter can be disabled by setting bit
ACF_DISABLE in the PROX_SETTINGS2 reg-
ister. This will increase response times, at the
expense of noise immunity.
Each channel can be configured to either give
a DYCALTM (default) or a direct-output through
the DYCAL_CHANS register. Configuring a
channel as a direct-output channel will yield that
the touch and prox indication bits will actively in-
dicate whether a channel detects either of these
events. The DYCALTM function will not be ap-
plied to direct-channels and any combination
of DYCALTM or direct-output channels can be
used.
7.6 Report Order (Channel Num-
7.9 Long Term Average (LTA)
The LTA filter can be seen as the baseline or
reference value. The LTA is calculated to con-
tinuously adapt to any environmental drift. The
LTA filter is calculated from the CS value for
each channel. The LTA filter allows the device to
adapt to environmental (slow moving) drift. Ac-
tuation (DYCAL, Touch or Prox) decisions are
made by comparing the CS value with the LTA
reference value. The 12bit LTA value is con-
tained in the LTA_H and LTA_L registers.
bers)
7.9.1 Filter Adaptation Rates
The data is reported in the sequence; Ch0, Ch1,
Ch2, Ch0, Ch1, Ch2, Ch0, etc. The chan-
nel number (CHAN_NUM) is used to indicate to
which channel the rest of the data in the dataset
belongs.
The LTA will adapt with different rates depend-
ing in which state the IC is in. Calculating a
new LTA value is a function of the old LTA and
the newly measured CS. The percentage of CS
used in this LTA calculation is specified as the
filter adaptation rate. 100% specifies that there
7.7 Transfer Frequency (fcx)
The frequency of the charge transfers can be
selected adjusting the XFER_FREQx bits. An
optimal transfer frequency must be selected for
a specific application.
are no filtering and LTA = CS. A lower percent-
age value for the adaptation rate will yield a
slower adaptation rate. The IQS253 contains
3 user adjustable adaptation rates.
Filter adaptation rate in non-TM
The LTA filter will adapt according to the
LTA_ADAPT rate if the IQS253 is in non-TM and
Copyright ©
Azoteq
IQS253 Datasheet V1.04
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