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IQS232 Schematic ( PDF Datasheet ) - Azoteq

Teilenummer IQS232
Beschreibung Configurable 2 Channel sensor
Hersteller Azoteq
Logo Azoteq Logo 




Gesamt 34 Seiten
IQS232 Datasheet, Funktion
IQ Switch®
ProxSense® Series
IQS232 Datasheet - Configurable 2 Channel sensor with
Compensation for Sensitivity Reducing Objects
Unparallelled Features:
J Sub 4 µA current consumption
J Automatic tuning for optimal operation in various environments & compensation against sensi-
tivity reducing objects
The IQS232 ProxSense® IC is a fully integrated two channel capacitive contact and proximity sensor
with market leading sensitivity and automatic tuning of the sense electrodes. The IQS232 provides
a minimalist implementation requiring as few as 2 external components. The device is ready for
use in a large range of applications while programming options allow customisation in specialised
applications.
Main features:
J 2 Channel input device
J Differentiated Touch and Distributed Proximity Electrode
J ATI: Automatic tuning to optimum sensitivity
J Supply Voltage1.8 V to 3.6 V
J Internal voltage regulator and reference capacitor
J OTP options available
J Direct (logic level) and serial data output
J Low Power Modes (sub 4 µA min)
J Adjustable Proximity & Touch Thresholds
J Automatic drift compensation
J Development and Programming tools available
J Small and cost effective SO-8 package
Applications:
J GUI trigger on proximity detection.
J White goods and appliances
J Remote Controls
J Office equipment, toys, sanitary ware
J Flame proof, hazardous environment Hu-
man Interface Devices
J Proximity detection that enables back light-
ing activation (Patented)
J Wake-up from standby applications
J Replacement for electro mechanical
switches
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IQS232 Prelimanary Datasheet V1.00
Azoteq
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IQS232 Datasheet, Funktion
IQ Switch®
ProxSense® Series
1.2 Applicability
All specifications, except where specifically men-
tioned otherwise, provided by this datasheet are
applicable to the following ranges:
J Temperature 40 °C to +85 °C
J Supply voltage (VDDHI) 1.8 V to 3.6 V
J Detection of PROX and TOUCH events.
J Managing outputs of the device.
J Managing serial communications.
J Manage programming of OTP options.
2 Analogue Functionality
The analogue circuitry measures the capacitance
of the sense electrodes attached to the Cx pins
through a charge transfer process that is period-
ically initiated by the digital circuitry. The mea-
suring process is referred to as a conversion
and consists of the discharging of Cs and Cx,
the charging of Cx and then a series of charge
transfers from Cx to Cs until a trip voltage is
reached. The number of charge transfers re-
quired to reach the trip voltage is referred to as
the counts (CS). The capacitance measurement
circuitry makes use of an internal CS and volt-
age reference (VREF). The analogue circuitry
further provides functionality for:
J Power on reset (POR) detection.
J Brown out detection (BOD).
3 Digital Functionality
The digital processing functionality is responsi-
ble for:
J Device configuration from OTP settings after
POR.
J Management of BOD and WDT events.
J Initiation of conversions at the selected rate.
J Processing of CS and execution of algorithms.
J Monitoring and automatic execution of the
ATI algorithm.
J Signal processing and digital filtering.
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IQS232 pdf, datenblatt
IQ Switch®
ProxSense® Series
Table 6.3: User Selectable Configuration Options: Bank 1 (Partial ATI)
tHALT1 tHALT0 MUL5 MUL4 MUL3 MUL2 MUL1 MUL0
bit 7
Bank 1 - Partial ATI
bit 0
Bank 1: bit 7:6
Bank 1: bit 5:4
Bank 1: bit 3:0
tHALT1:tHALT0: Halt time of Long Term Average
00 = 20 seconds
01 = 40 seconds
10 = Never
11 = Always (Prox on 40)
MUL5:MUL4: Sensitivity Multipliers
00 = Lowest
11 = Highest
MUL3:MUL0: Base Multipliers
0000 = Lowest
1111 = Highest
Section 7.5
Section 7.7
Section 7.8
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