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iq switch 3 channel capacitive sensor unparalleled features sub 3ua current consumption automatic tuning for optimal operation in various e nvironments the IQS243 proxsense ? ic is a fully integrated sensor with market leading sensitivity provides a cost effective implementation use in a large range of applications while a host. main features 3 channel input device proximity & touch on each channel i2c tm compatible data output ati: automatic tuning to optimum sensitivity supply voltage 1.8v (abs min) multiple power modes internal voltage regulator and large proximity detection range automatic drift compensation development tools ava ilable (visualproxsense and usb dongles small outline msopC10 applications white goods and appliances office equipment, toys, sanitary ware proximity detection that enables wake- up from standby applications replacement for electromechanical switches gui trigger and gui control IQS243 datasheet iq switch ? - proxsense ? series capacitive sensor with i 2 c tm compatible interface and compensation sensitivity reducing objects current consumption automatic tuning for optimal operation in various e nvironments is a fully integrated 3 channel capacitive contact with market leading sensitivity and automatic tuning to the sense antenna. the implementation in a small outline package. the device is ready for use in a large range of applications while the i 2 c tm compatible interface provides full control to proximity & touch on each channel output to optimum sensitivity (abs min) to 3.6v (abs max) and reference capacitor proximity detection range automatic drift compensation ilable (visualproxsense and usb dongles ) white goods and appliances office equipment, toys, sanitary ware enables backlighting activation (patented) up from standby applications replacement for electromechanical switches and gui control proximity detection available options t a msop - 10 -40 c to 85 c IQS243 series compensation for contact and proximity antenna. the IQS243 the device is ready for interface provides full control to
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 2 of 29 all rights reserved. revision 1.0 january 2012 functional overview 1 introduction the IQS243 is a three channel capacitive proximity and touch sensor featuring an internal voltage regulator and reference capacitor (cs). the device has three dedicated input pins for the connection of the sense antennas. three output pins are used for serial data communication through the i 2 c tm compatible protocol, including an optional rdy pin. the device automatically tracks slow varying environmental changes via various filters, detect noise and has an automatic antenna tuning implementation (auto - ati) to tune the device for optimal sensitivity. 1.1 applicability all specifications, except where specifically mentioned otherwise, provided by this datasheet are applicable to the following ranges: temperature -40c to +85c supply voltage (vddhi) 1.8v to 3.6v 1.2 pin-outs figure 1.1 IQS243 pin layout table 1.1 IQS243 pin-outs. pin IQS243 msop 10 function 1 vss ground 4 vddhi power input 5 vreg regulator pin 2 cx0 sense electrode 3 cx1 sense electrode 9 cx2 sense electrode 10 adr0 i 2 c tm sub address selection 6 rdy /rf i 2 c tm ready or rf input pin 7 sda i 2 c tm data 8 sck i 2 c tm clock 2 analogue functionality the analogue circuitry measures the capacitance of the sense antennas attached to the cx pins through a charge transfer process that is periodically initiated by the digital circuitry. the capacitance measurement circuitry makes use of an internal reference capacitor cs and voltage reference (vreg). the measuring process is referred to as a conversion and consists of the discharging of cs and cx capacitors, 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 required to reach the trip voltage is referred to as the current sample (cs).
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 3 of 29 all rights reserved. revision 1.0 january 2012 the analogue circuitry further provides functionality for: power on reset (por) detection. brown out detection (bod). 3 digital functionality the digital processing functionality is responsible for: management of bod and wdt events. initiation of conversions at the selected rate. processing of cs and execution of algorithms. monitoring and automatic execution of the ati algorithm. signal processing and digital filtering. detection of prox and touch events. managing outputs of the device. managing serial communications. detailed description 4 reference design figure 4.1 reference design. 5 high sensitivity through patented design and advanced signal processing, the device is able to provide extremely high sensitivity to detect proximity. this enables designs that can detect proximities at a much greater range than other capacitive sensors. when the device is used in the presence of noise or floating metal that lower the sensitivity, a reduced proximity threshold is proposed to ensure reliable functioning of the sensor. the high sensitivity allows the device to sense accurately through overlays with low dielectric constant materials such as wood or even air-gaps. vreg 5 vddhi 4 cx0 2 cx1 3 vss 1 cx2 9 sck 8 sda 7 rdy/rf 6 adr0 10 IQS243 c1 1uf c2 100pf vddhi gnd c3 1uf c4 100pf gnd sense pad1 cx0 sense pad2 cx1 sense pad3 cx2 i2c_sda i2c_scl r2 470r r3 470r r1 470r r4 4.7k r5 4.7k vddhi rdy/rf adr0 gnd r6 4.7k use c2 and c4 for added rf noise immunity. place c1-c4 as close as possible to ic, connected t o good gnd. r4, r5 and r6 used as pull up resistors for i 2 c tm protocol (4.7k to 10k typical). rdy pin and r6 required for event mode. refer to application note (azd008) on key pad desig n.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 4 of 29 all rights reserved. revision 1.0 january 2012 please refer to the application note section on the azoteq website for more design tips and other application dependent recommendations. 6 adjustable proximity threshold the proximity threshold is selected by the designer to obtain the desired proximity sensitivity and is selectable between 1 (most sensitive) to 254 (least sensitive). the IQS243 has a default proximity threshold (p th ) of 4 for all channels. proximity thresholds for the sense electrodes are individually adjustable between the specified limits. a proximity event is identified when for at least 6 consecutive samples the following equation holds: p th =< lta-cs where lta is the long term average 7 adjustable touch thresholds the touch threshold is selected by the designer to obtain the desired touch sensitivity and is selectable between 1/255 (most sensitive) to 254/255 (least sensitive). the IQS243 has a default touch threshold (t th ) of 32/255 (for all 3 channels). the touch threshold is expressed as a fraction of the lta as follows: t th = selected touch threshold x lta where lta is the long term average the touch event is triggered based on t th , cs and lta. a touch event is identified when for at least 2 consecutive samples the following equation holds: t th =< lta-cs with lower average cs (therefore lower lta) values the touch threshold will be lower and vice versa. individual touch threshold can be set for each channel. 8 charge transfers the IQS243 samples in 4 timeslots. the charge sequence is shown in figure 8.1, where ch0 is the prox channel, which charges before each of the 3 input channels. ch0 is realised by connecting all three touch electrodes with internal switches. therefore: ch0 is a distributed electrode formed by the 3 touch electrodes. proximity can be detected by the distributed electrode (crx0+crx1+crx2) and each individual sense electrode (crx0, crx1 and crx2). 9 i2c communication the IQS243 device interfaces to a master controller via a 2 wire serial interface bus that is i 2 c tm compatible. an optional rdy pin is available to indicate the communication window (required for event mode). the IQS243 has four available sub addresses, 44h (default) to 47h that is selected upon purchase of the ic. the adr0 pin can also be pulled low to increase the i2c address by one decimal value (for example from 44h to 45h). the maximum i 2 c tm compatible communication speed for the IQS243 is 400kbit/s. please refer to the IQS243 communications interface and sample code document for further details.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 5 of 29 all rights reserved. revision 1.0 january 2012 figure 8.1 charging and communications sequence for the IQS243. 9.1 memory mapping address size(bytes) 00h-0fh 16 device information r/w r 10h-30h 32 device specific data r/w 31h-34h 4 proximity status bytes r/w r 35h-38h 4 touch status bytes r/w r
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 6 of 29 all rights reserved. revision 1.0 january 2012 39h-3ch 4 halt bytes r/w r 3dh-41h 4 active bytes (indicate cycle) r/w r 42h-82h 64 current samples r/w r 83h-c3h 64 ltas r/w r c4h-fdh 64 device settings r/w w
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 7 of 29 all rights reserved. revision 1.0 january 2012 9.1.1 device information information regarding the device type and version i s recorded here. any other information specific to the device version can be stored here. each azoteq rom has a unique product- and version number. 00h product number (prod_num) r/w bit 7 6 5 4 3 2 1 0 36d r 01h version number (version_num) r/w bit 7 6 5 4 3 2 1 0 01d r 9.1.2 device specific data 10h system status flags (sysflags) r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use ati busy rf noise zoom r ati busy indicates whether the device is performing an ati 0: ati not busy 1: ati busy rf noise indicates whether rf noise is detected 0: not detected 1: detected zoom indicates whether the device is in zoom mode 0: not in zoom 1: in zoom 9.1.3 proximity status bytes the proximity status of all the channels on the dev ice are shown here. if a byte is set it indicates a proximity condition on the specified ch annel.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 8 of 29 all rights reserved. revision 1.0 january 2012 31h proximity (prox_stat) r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use ch3 ch2 ch1 ch0 r the show_reset byte is automatically set whenever t he device is reset. setting the ack reset byte in the proxsense module settings 2 regis ter clears the show_reset byte. 32h show reset (show_reset) r/w bit 7 6 5 4 3 2 1 0 show_reset system use system use system use system use system use system use system use r 9.1.4 touch status bytes the touch status of all the channels on the device are shown here. if a byte is set it indicates a touch condition on the specified channel. 35h touch status 0 (touch_stat0) r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use ch3 ch2 ch1 system use r 36h touch status 1 (touch_stat1) r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r 9.1.5 halt bytes the filter halt status of all the channels on the d evice are shown here. if a byte is set it indicates that the filters have been halted on the specified channel.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 9 of 29 all rights reserved. revision 1.0 january 2012 39h halt 0 (halt_stat0) r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use ch3 ch2 ch1 ch0 r 3ah halt 1 (halt_stat1) r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r 9.1.6 channel number the decimal number in the active channel register i ndicates the active channel. 3dh active channel (act_chan) r/w bit 7 6 5 4 3 2 1 0 decimal number indicating active channel (ch0 C ch3) r 9.1.7 current samples the current samples stored in this register are fro m the current cycle only as indicated in the active channel register. 42h current sample high (cur_sam_hi) r/w bit 7 6 5 4 3 2 1 0 high byte r 43h current sample low (cur_sam_lo) r/w bit 7 6 5 4 3 2 1 0 low byte r 9.1.8 long-term averages the long-term averages stored in this register are from the current cycle only.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 10 of 29 all rights reserved. revision 1.0 january 2012 83h long-term average high (lta_hi) r/w bit 7 6 5 4 3 2 1 0 high byte r 84h long-term average low (lta_lo) r/w bit 7 6 5 4 3 2 1 0 low byte r 9.1.9 device settings target count 0 and 1 sets the target cs value for t he respective channels. if data is written to one of these channels and the lta is out of range a re-ati event will occur, unless a touch condition is active on the channel where the re-ati will wait until the touch condition is lifted. the default target cs for ch0 with a register value target count ch0 = 128 then becomes 128*8=1024. the device will re-ati when the lta dri fts out of the target 128 (default) range. c4h target count ch0 (target_cnt0) r/w bit 7 6 5 4 3 2 1 0 target count value (x8) r/w default: 128 decimal (re-ati boundary) c5h target count (target_cnt1) r/w bit 7 6 5 4 3 2 1 0 target count value (x8) for ch1 C ch3 r/w default: 128 decimal (re-ati boundary) r/w the compensation for each channel can be set by wri ting the appropriate value to the corresponding channels compensation register. the c ompensation directly influences the sensitivity of a channel and will trigger a re-ati when the lta of the respective channels are out of range.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 11 of 29 all rights reserved. revision 1.0 january 2012 c6h channel 0 compensation setting (ch0_comp) r/w bit 7 6 5 4 3 2 1 0 compensation 0 <5:0> r/w c7h channel 1 compensation setting (ch1_comp) r/w bit 7 6 5 4 3 2 1 0 compensation 1 <5:0> r/w c8h channel 2 compensation setting (ch2_comp) r/w bit 7 6 5 4 3 2 1 0 compensation 2 <5:0> r/w c9h channel 3 compensation setting (ch3_comp) r/w bit 7 6 5 4 3 2 1 0 compensation 3 <5:0> r/w cah system use r/w bit 7 6 5 4 3 2 1 0 system use r/w cbh system use r/w bit 7 6 5 4 3 2 1 0 system use r/w cch system use r/w bit 7 6 5 4 3 2 1 0 system use r/w
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 12 of 29 all rights reserved. revision 1.0 january 2012 cdh system use r/w bit 7 6 5 4 3 2 1 0 system use r/w ceh system use r/w bit 7 6 5 4 3 2 1 0 system use r/w cfh system use r/w bit 7 6 5 4 3 2 1 0 system use r/w the multiplier setting register for each channel se ts the gain values which determine the sensitivity and compensation to reach the ati routi ne target. the table below provides a description of the bits that can be set in the ch0 C ch3 multiplier setting registers. by writing to the multiplier settings of a channel, the indivi dual channel that is active in that specific time slot (indicated in the channel sequence 0 and 1 reg isters) will undergo a re-ati event if the new multiplier settings results in the lta being ou t of range . mul5:mul4 sensitivity multiplier mul3:0 compensation multiplier base1:0 the base value influences the overall sensi tivity of the channel and establishes a base count from where the ati algorithm starts executing. the following options a re available: 00 C 200 01 C 50 10 C 100 11 C 250
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 13 of 29 all rights reserved. revision 1.0 january 2012 d0h channel 0 multiplier setting (mult_ch0) r/w bit 7 6 5 4 3 2 1 0 base1 base0 mul5 mul4 mul3 mul2 mul1 mul0 r/w d1h channel 1 multiplier setting (mult_ch1) r/w bit 7 6 5 4 3 2 1 0 base1 base0 mul5 mul4 mul3 mul2 mul1 mul0 r/w d2h channel 2 multiplier setting (mult_ch2) r/w bit 7 6 5 4 3 2 1 0 base1 base0 mul5 mul4 mul3 mul2 mul1 mul0 r/w d3h channel 3 multiplier setting (mult_ch3) r/w bit 7 6 5 4 3 2 1 0 base1 base0 mul5 mul4 mul3 mul2 mul1 mul0 r/w d4h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w d5h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 14 of 29 all rights reserved. revision 1.0 january 2012 d6h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w d7h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w d8h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w d9h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w the proximity sensitivity settings of each respecti ve channel sets the cs threshold for a proximity event on the specified channel (refer to section 6). a custom value between 1 and 254 can be selected by setting bits pt_7 to pt_0. dah proximity sensitivity settings ch0 (prox_th_ch0) r/w bit 7 6 5 4 3 2 1 0 pt_7 pt_6 pt_5 pt_4 pt_3 pt_2 pt_1 pt_0 r/w custom value between 1 and 254 default 0 0 0 0 0 1 0 0
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 15 of 29 all rights reserved. revision 1.0 january 2012 dbh proximity sensitivity settings ch1 (prox_th_ch1) r/w bit 7 6 5 4 3 2 1 0 pt_7 pt_6 pt_5 pt_4 pt_3 pt_2 pt_1 pt_0 r/w custom value between 1 and 254 default 0 0 0 0 0 1 0 0 dch proximity sensitivity settings ch 2 (prox_th_ch2) r/w bit 7 6 5 4 3 2 1 0 pt_7 pt_6 pt_5 pt_4 pt_3 pt_2 pt_1 pt_0 r/w custom value between 1 and 254 default 0 0 0 0 0 1 0 0 ddh proximity sensitivity settings ch3 (prox_th_ch3) r/w bit 7 6 5 4 3 2 1 0 pt_7 pt_6 pt_5 pt_4 pt_3 pt_2 pt_1 pt_0 r/w custom value between 1 and 254 default 0 0 0 0 0 1 0 0 deh system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w the touch sensitivity setting of each respective ch annel sets the cs threshold for a touch event on the specified channel. a custom value betw een 1 and 254 can be selected by setting bits.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 16 of 29 all rights reserved. revision 1.0 january 2012 dfh touch sensitivity settings ch1 (touch_th_ch1) r/w bit 7 6 5 4 3 2 1 0 tt_7 tt_6 tt_5 tt_4 tt_3 tt_2 tt_1 tt_0 r/w custom value between 1 and 254, used as value/255 r/w default 32/255 e0h touch sensitivity settings ch2 (touch_th_ch2) r/w bit 7 6 5 4 3 2 1 0 tt_7 tt_6 tt_5 tt_4 tt_3 tt_2 tt_1 tt_0 r/w custom value between 1 and 254, used as value/255 r/w default 32/255 e1h touch sensitivity settings ch3 (touch_th_ch3) r/w bit 7 6 5 4 3 2 1 0 tt_7 tt_6 tt_5 tt_4 tt_3 tt_2 tt_1 tt_0 r/w custom value between 1 and 254, used as value/255 r/w default 32/255 e2h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 17 of 29 all rights reserved. revision 1.0 january 2012 e3h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w e4h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w e5h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w e6h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w e7h system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w e8h proxsense module settings 0 (prox_settings0) r/w bit 7 6 5 4 3 2 1 0 ati off partial ati ati current channel redo_ati reseed cs size system use system use r/w
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 18 of 29 all rights reserved. revision 1.0 january 2012 default 0 0 0 0 0 0 1 0 ati off if this bit is set, the ati routine will be disabled 0: ati on 1: ati off partial ati uses the multipliers to determine the s ensitivity and compensation to reach the ati target, instead of th e full ati routine 0: disabled 1: enabled ati current channel performs a re-ati on the current channel, as indica ted by the sequence register 3dh redo ati forces the ati routine to run when a 1 i s written into this bit position. ati off in address e8h bit 7 takes priori ty reseed all channels are reseeded when a 1 is writ ten into this bit position. the ltas are set to 8 counts below the c urrent samples cs size the internal charge capacitor is normally 2 9.9pf, if this bit is set the charge capacitor becomes 59.8pf e9h proxsense module settings 1 (prox_settings1) r/w bit 7 6 5 4 3 2 1 0 system use crx float turbo mode halt charge/ulp noise detect on system use system use system use r/w default 0 0 0 0 0 0 0 0
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 19 of 29 all rights reserved. revision 1.0 january 2012 crx float during conversions the inactive channels are grounded in order to minimize noise coupling. if this bit is se t the receiver electrodes will float when inactive turbo mode if this bit is set, conversions are perf ormed as fast as processing and communication allows, thereby maximi zing detection speed halt charge/ulp set this bit to stop all conversions. the device wi ll now draw the minimum amount of power noise detect on enables the noise detection 0: disabled 1: enabled eah proxsense module settings 2 (prox_settings2) r/w bit 7 6 5 4 3 2 1 0 ack reset wdt off force halt ac filter disable timeout disable event mode halt1 halt0 r/w default 0 0 0 0 0 0 0 0
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 20 of 29 all rights reserved. revision 1.0 january 2012 ack reset clears the reset bit 0 = default 1 = clears show_reset wdt off disable the watchdog timer 0 = enabled 1 = disabled force halt forces the long term average of all chan nels to stop being calculated 0: lta updates normally 1: lta is halted ac filter disable set the ac filter. disabling the ac filter will ena ble a faster response time 0 = enabled 1 = disabled timeout disable if this bit is set, a timeout will be allowed on th e communication 0 = disabled 1 = enabled event mode sets event driven i 2 c communication 0 = event mode 1 = streaming mode halt1:halt0 sets the halt time for the lta (time be fore recalibration) 00 = 20 seconds 01 = 40 seconds 10 = never 11 = permanent
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 21 of 29 all rights reserved. revision 1.0 january 2012 ebh proxsense module settings 3 (prox_settings3) r/w bit 7 6 5 4 3 2 1 0 beta1 ch0 beta0 ch0 beta1 beta0 alternative ati enable system use charge xfer speed 1 charge xfer speed 0 r/w default 0 1 0 1 0 n/a 0 1 beta1:0 ch0 beta ch0 00: 1/32 01: 1/64 10: 1/128 11: 1/256 beta1:0 beta (ch1 to ch3) 00: 1/32 01: 1/64 10: 1/128 11: 1/256 alternative ati enable set the alternative ati function 0 = disable 1 = enable charge xfer speed0:1 charge transfer speed 00: 1mhz 01: 500khz 10: 250khz (period will be too long and negativel y impact times) 11: 125khz (period will be too long and negative ly impact times)
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 22 of 29 all rights reserved. revision 1.0 january 2012 ech channel enable for ch0 C ch3 (chan_enable) r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use ch3 ch2 ch1 ch0 r/w ch3:ch0 software enable or disable of channels: 0 = channel disabled 1 = channel enabled edh system use r/w bit 7 6 5 4 3 2 1 0 system use system use system use system use system use system use system use system use r/w eeh low power settings (low_power) r/w bit 7 6 5 4 3 2 1 0 custom value between 1 and 256 C value x 16ms = lp period r/w default normal power default (00h). see note below. r/w note: while in any power mode the device will zoom to boost power (bp) mode whenever a current sample (cs) indicates a possible proximity or touch event. this improves the response time. the device will remain in bp for t zoom seconds and then return to the selected power mode. the zoom function allows reliable detection o f events with current samples being produced at the bp rate. f0h default comms pointer (dflt_comms_ptr) r/w bit 7 6 5 4 3 2 1 0 default 10h w
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 23 of 29 all rights reserved. revision 1.0 january 2012 10 antenna tuning implementation (ati) ati is a sophisticated technology implemented in the latest generation proxsense ? devices that optimises the performance of the sensor in a wide range of applications and environmental conditions (refer to application note azd0027 - antenna tuning implementation). ati adjusts internal circuitry according to two parameters, the ati multiplier and the ati compensation. the ati multiplier can be viewed as a course adjustment and the ati compensation as a fine adjustment. the adjustment of the ati parameters will result in variations in the current sample and sensitivity. sensitivity can be observed as the change in current sample as the result of a fixed change in sensed capacitance. the ati parameters have been chosen to provide significant overlap. it may therefore be possible to select various combinations of ati multiplier and ati compensation settings to obtain the same current sample. the sensitivity of the various options may however be different for the same current sample. 10.1 automatic ati the IQS243 implements an automatic ati algorithm. this algorithm automatically adjusts the ati parameters to optimise the sensing antennas connection to the device. the device will execute the ati algorithm whenever the device starts-up (default target is 1024 counts for all the channels) and when the current samples are not within a predetermined range (default target +- 128). while the automatic ati algorithm is in progress this condition will be indicated in the streaming data and proximity and touch events cannot be detected. the device will only briefly remain in this condition and it will be entered only when relatively large shifts in the current sample is detected. the automatic ati function aims to maintain a constant current sample, regardless of the capacitance of the sense antenna (within the range of the device). the effects of auto-ati on the application are the following: automatic adjustment of the device configuration and processing parameters for a wide range of pcb and application designs to maintain an optimal configuration for proximity and touch detection. automatic tuning of the sense antenna at start-up to optimise the sensitivity of the application. automatic re-tuning when the device detects changes in the sensing antennas capacitance to accommodate a large range of changes in the environment of the application that influences the sensing antennas. re-tuning only occurs during device operation when a relatively large sensitivity reduction is detected. this is to ensure smooth operation of the device during operation. re-tuning may temporarily influences the normal functioning of the device, but in most instances the effect will be hardly noticeable. shortly after the completion of the re- tuning process the sensitivity of proximity detection may be reduced slightly for a few seconds as internal filters stabilises. automatic ati can be implemented so effectively due to: excellent system signal to noise ratio (snr). effective digital signal processing to remove ac and other noise. the very stable core of the devices. the built in capability to accommodate a large range of sensing antenna capacitances.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 24 of 29 all rights reserved. revision 1.0 january 2012 10.2 partial ati partial ati allows the designer to manually adjust the gain of the various channels to fit the specific needs of the application. by default (address: e8h bit 6 = 0) the ati routine sets the required base value of the touch channels to 250 counts. the required base value for the proximity channel is specified through i 2 c commands in address d0h bits [7:6] with the default being 200. the base value for each individual channel can be set via bits [7:6] on the address range d0h to d3h. alternatively, the user can set the multiplier bits [5:0] in addresses d0h through d3h which would determine the sensitivity, and compensation (scaled) to reach the ati target. with the base value set, the partial ati routine would use a convergence technique with a fixed amo u nt of steps to reach its aimed value. 10.3 alternative ati the alternative ati implementation ensures that the base and multiplier values are identical for all the channels and adjusts only the compensation in order to achieve the desired current samples. the alternative ati can be enabled by setting bit [3] of address ebh.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 25 of 29 all rights reserved. revision 1.0 january 2012 11 specifications 11.1 absolute maximum specifications the following absolute maximum parameters are speci fied for the device: exceeding these maximum specifications may cause da mage to the device. operating temperature -40c to 85c supply voltage (vddhi C vss) 3.6v maximum pin voltage vddhi + 0.5v (may not exceed vddhi max) maximum continuous current (for specific pins) 10m a minimum pin voltage vss - 0.5v minimum power-on slope 100v/s esd protection 4kv human body model maximum pin temperature during soldering 350c ( 10 seconds) maximum body temperature during soldering 300c (10 seconds) package moisture sensitivity level (msl) 3 table 11.1 IQS243 general operating conditions 1 description conditions parameter min typ max unit supply voltage - v ddhi 1.8 3.3v 3.6 v internal regulator output 1.8 v ddhi 3.6 v reg 1.63 1.7 1.77 v boost operating power vddhi: 3.3v low_power register:0 turbo mode: on i IQS243 bp - 152 - a normal operating power vddhi: 3.3v low_power register: 0 turbo mode: off i IQS243 np - 148 - a lp mode 1* vddhi: 3.3v low_power register: 4 i IQS243 lp1 - 45 - a lp mode 2* vddhi: 3.3v low_power register: 8 i IQS243 lp2 - 20.7 - a lp mode 3* vddhi: 3.3v low_power register: 16 i IQS243 bp3 - 10.6 - a 1 operating current shown in this datasheet, does no t include power dissipation through i 2 c pull up resistors.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 26 of 29 all rights reserved. revision 1.0 january 2012 description conditions parameter min typ max unit lp mode 4* vddhi: 3.3v low_power register:32 i IQS243 lp4 - 5.6 - a lp mode 5* vddhi: 3.3v low_power register: 64 i IQS243 lp5 - 3.5 - a lp mode 6* vddhi: 3.3v low_power register: 128 i IQS243 lp6 - 2.5 - a *lp interval period = low power value x 16ms table 11.2 start-up and shut-down slope characteris tics description conditions parameter min max unit power on reset v ddhi slope 100v/s @25c por 1.2 1.6 v brown out detect v ddhi slope 100v/s @25c bod 1.15 1.55 v table 11.3 initial touch times description parameter typical unit bp 1 response time 13 ms np response time 45 ms lp6 response time 2000 ms 1 communication and charge frequency to comply with s ample rate as reported earlier in this datasheet.
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 27 of 29 all rights reserved. revision 1.0 january 2012 12 mechanical dimensions figure 12.1 msop-10 back view. figure 12.2 msop-10 side view. figure 12.3 msop-10 top view. figure 12.4 msop-10 footprint. table 12.1 msop-10 footprint dimensions from figure 12.4. dimension [mm] pitch 0.50 c 4.40 y 1.45 x 0.30
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 28 of 29 all rights reserved. revision 1.0 january 2012 13 device marking revision x = ic revision number temperature range t = i -40c to 85c (industrial) = c 0c to 70c (commercial) ic configuration z = sub address configuration (hexadecimal) 0 = 44h 1 = 45h 2 = 46h 3 = 47h date code p = package house ww = week yy = year 14 ordering information orders will be subject to a moq (minimum order quan tity) of a full reel. contact the official distributor for sample quantities. a list of the di stributors can be found under the distributors section of www.azoteq.com. for large orders, azoteq can provide pre-configured devices. the part-number can be generated by using usbprog.e xe or the interactive part number generator on the website. ic name IQS243 = IQS243 configuration z = sub address configuration (hexadecimal) package type ms = msop-10 bulk packaging r = reel (4000pcs/reel) C moq = 4000pcs t = tube (96pcs/tube) special order only
iq switch ? proxsense ? series copyright ? azoteq (pty) ltd 2011. IQS243 datasheet page 29 of 29 all rights reserved. revision 1.0 january 2012 15 contact information please visit the azoteq website for a list of distr ibutors and representations world wide. headquarters: pretoria office physical address 160 witch hazel avenue hazel court 1, 1 st floor highveld techno park centurion, gauteng republic of south africa tel: +27 12 665 2880 fax: +27 12 665 2883 postal address po box 16767 lyttelton 0140 republic of south africa paarl office physical address 109 main street paarl 7646 western cape republic of south africa tel: +27 21 863 0033 fax: +27 21 863 1512 postal address po box 3534 paarl 7620 republic of south africa the following patents relate to the device or usage of the device: us 6,249,089 b1, us 6,621,225 b2, u s 6,650,066 b2, us 6,952,084 b2, us 6,984,900 b1, us 7,084,526 b2, us 7,084,531 b2, us 7,119,459 b2, us 7,265,494 b2, us 7,291,940 b2, us 7,329,970 b2, us 7,336,037 b2, us 7,443,101 b2, us 7,466,040 b2, us 7,498,749 b2, us 7,528,508 b2, us 7,755,219 b2, us 7,772,781, us 7,781,980 b2, us 7,915,765 b2, ep 1 120 018 b1, ep 1 206 168 b1, ep 1 308 913 b1, ep 1 530 178 b1, zl 99 8 14357.x, aus 761094 iq switch?, proxsense?, lightsense?, airbutton? and the logo are trademarks of azoteq. the information in this datasheet is believed to be accurate at the time of publication. azoteq assumes no liability arising from the use of the in formation or the product. the applications mentioned herein are used solely for the purpose of illustration and azoteq makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. azoteq products are not authorized for use as critical components in life support devices or systems. no licenses to patents are granted, implicitly or otherwise, under any intellectual property rights. azoteq reserves the right to alter its products without prior notification. for the most up-to-date information, please refer to www.azoteq.com . www.azoteq.com proxsensesupport@azoteq.com
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