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www.semtech.com /products/ page 1 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. description features the SX8122 is an analog controlled of 1 volt motor/ led timer. the SX8122 toggles its output high or low according to the state of an analog pin (trigger). threshold voltages on the analog pi n are set to 1/3 and 2/3 of vdd. one output pin (led) send bursts when the motor is on to control a led which threshold voltage is above vdd or to generate a boosted supply. one output goes low when vdd is higher than the full charge voltage of an nimh cell to control a minimal charger. the SX8122 controls its io state starting at 0.6v to facilitate power-up. 1 v operation 1 button operation boosted led control (drives bright white and green leds) nimh cell charger control (allows usb recharge) applications toys - led animation led pointer usb rechargeable 555 timer applications ordering information part number function time out SX8122istrt 1v motor controller set by externals - available in tape and reel only - weee/rohs compliant- pb-free and halogen free. functional bloc diagram SX8122 burst 41khz vdd motor vss led trigger discharge charge nimh rtdown rtup ct 3 - 5v charger motor led 1 ? 2 v alkaline nimh or nicd cell vdd 1.41 v
acs - revision 2.2 august 2010 ? semtech corp. www.semtech.com /products/ page 2 section page table of content advanced communications & sensing datasheet SX8122 1v motor/led timer e lectrical s pecification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.1 operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 circuit specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 3.1 soic-8 pinout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 t echnical d escription . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 system architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.1 SX8122 architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.2 SX8122 timer behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4.3 active modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4.4 nimh pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5 operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.1 safe mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.2 low batt mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 5.3 active modes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 a pplication e xamples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6 motor and led timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.1 dual slope controlled oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 6.2 single shot timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 power management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7.1 low bat indicator for alkaline cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 m echanical s pecification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.1 soic-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.1.1 outline drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8.1.2 land pattern. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 8.1.3 marking information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
www.semtech.com /products/ page 3 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. electrical specification 1 absolute maximum ratings note the absolute maximum ratings, in table below, are stress ratings only. functional operation of the device at conditions ot her than those indicated in the operating conditions sections of this specification is not implied. exposure to the absolute maximum rati ngs, where different to the operating conditions, for an extended period may reduce the reliability or useful lifetime of the product. table 1. absolute maximum ratings parameter symbol min max unit supply voltage v amrvdd -0.3 2.5 v pin voltage (non-supply pins) v amrvin vss - 0.3 vdd + 0.3 v sink or source current on any pin i amriss -100 100 ma storage temp t stor -50 +150 c esd conditions hbm esd hbm 4000 v cdm esd cdm 1000 v mm esd mm 200 v esd caution esd (electrostatic discharge) sensitive device charged devices and circuit boards can discharge without detection. athough this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy esd. therfore, proper esd precaution should be taken to avoid performance degradation or loss of functionality.
www.semtech.com /products/ page 4 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. 2specifications 2.1 operating conditions 2.2 circuit specification note circuit operates within the supply voltage range vdd-vss = vddoc. the specification is verified within the fu ll spec voltage range vdd-vss = vddspec. table 2. operating range parameter symbol min max unit supply voltage range v ddoc 0.9 2.0 v full spec voltage range v ddspec 1.0 1.8 v ambient temperature t oc -40 +85 c note conditions: temperature within toc and vdd-vss within vddspec, unless otherwise stated. table 3. circuit electrical specification parameter symbol min typ max unit safe mode low limit v safe 0.6 0.7 v por voltage threshold v por 0.9 v hysteresis v porhyst 150 mv switch on level v on 0.95 1.07 1.15 v switch off level t : 0 to 70c v off 0.85 0.95 1.00 v t : -40 to 85c 0.85 0.95 1.05 v v on vdd on : active or sleep low batt safe low batt safe v off v por mode : time v safe v porhyst
www.semtech.com /products/ page 5 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. table 4. circuit power consumption specifications parameter symbol min typ max unit supply current in force charge and continue charge modes (outputs no loaded, motor pin on, burst on led pin) vdd=1.2v i charge 54 a vdd=2.0v 80 a supply current in force discharge and continue discharge modes (outputs no loaded, motor pin off, led pin tied to ground) vdd=1.2v i discharge 50 a vdd=2.0v 73 a supply current in sleep mode (outputs no loaded, motor pin off, led pin tied to ground) vdd=1.2v i sleep 10 30 a vdd=2.0v 15 40 a supply current in low batt mode i lowbatt 10 30 a supply current in safe mode i safe 10 a table 5. digital ios specifications parameter symbol min typ max unit output high voltage v oh 3/4 vdd vdd v output low voltage v ol vss 1/4 vdd v max source current at min voh vdd = 0.9 v i oh09 4ma vdd >= 1.2 v i oh12 10 ma max sink current at max vol vdd = 0.9 v i ol09 4ma vdd >= 1.2 v i ol12 10 ma input capacitance c i 10 pf table 6. general specifications parameter symbol min typ max unit startup time at power-on t start 0.1 s threshold voltage high on trigger v thigh 0.66 vdd threshold voltage low on trigger v tlow 0.33 vdd nimh pin switch voltage threshold v nimh 1.41 v hysteresis 30 mv
www.semtech.com /products/ page 6 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. 3pinout 3.1 soic-8 pinout table 7. SX8122 pinout pin pin name pin type pin function safe mode low batt mode 1 trigger analog input signal used to trigger the device high impedance high impedance 2 discharge output open collector to vss used to discharge the capacitive load via a resistor high impedance vss 3 charge output open collector to vdd used to charge the capacitive load via a resistor high impedance open source 4 nimh digital output checks the battery status high impedance vdd 5 led digital output sends bursts to light a led when the motor is on high impedance vss 6 vss power ? ground negative supply and ic ground - - 7 motor digital output motor control output high impedance vss 8 vdd power ? positive positive supply - - figure 1. SX8122 pinout trigger discharge charge nimh vdd motor vss led 18
www.semtech.com /products/ page 7 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. technical description 4 system architecture 4.1 SX8122 architecture the system is based on the cyclic acqu isition of the trigger and vdd voltages. 4.2 SX8122 timer behavior the SX8122 has an internal level detector that comp ares the trigger volatge to the vdd voltage. when trigger is above 2/3 of vdd, the comparator sets its output to high; when the trigger is below 1/3 of vdd, the comparator sets its output to low. as long as the trigger voltage is between 1/3 vdd and 2/3 vdd, the comparator output remains unchanged. figure 2. SX8122 architecture r s q q 2/3 vdd 1/3 vdd vdd vss 1.41v burst vdd vdd trigger discharge charge nimh motor vss led
www.semtech.com /products/ page 8 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. 4.3 active modes the circuit has 4 modes of operation when on: 1. force charge: pin charge is connected to pin vdd, pin discharge is in open drain. 2. continue charge: pin charge is connected to pin vdd, pin discharge is in open drain. 3. force discharge: pin discharge is connected to pin vss, pin charge is in open source. 4. continue discharge: pin discharge is connected to pin vss, pin charge is in open source. when trigger voltage is below 1/3 of vdd, then the circuit is in force charge mode (1) . when trigger voltage is above 2/3 of vdd, then the circuit is in force discharge mode (3). when trigger voltage is between 1/3 of vdd and 2/3 of vdd, the circuit goes into mode 2 or 4 depending on which mode it was previousely. the acquisition cycle is continuous and has a cycle frequency of ~5 khz. 4.4 nimh pin pin nimh goes high when vdd is below the nimh th reshold of 1.41v and low when vdd is above the same threshold. a 30mv hysteresis allow to remove nimh pin oscilla tion when the vdd voltage is near the threshold. the supply voltage on vdd pin is checked at a 1hz rate, so the nimh pin can switch with a delay of 1 seconds max.
www.semtech.com /products/ page 9 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. 5operating modes 5.1 safe mode the internal system goes in safe mode as soon as the battery voltage is above 0.6-0.7v. in this mode all pins are set in high impedance and are inac tive. this guarantees a safe start-up when a battery is inserted. the power consumption is 10ua max and prevents th e battery from leaking when it is empty. 5.2 low batt mode the device is in low batt mode as soon as the battery voltage reaches the 0.9v por threshold. in this mode, each output pin is in a static state. the device will not react to the trigger pin. the led and motor pins are set to ground. the chip internally checks the vdd voltage each seconds and wakes up to sleep mode when vdd > v on ( 1.05v typical). nimh pin is forced high until the vdd vo ltage goes below 0.9v (back to safe mode), or above 1.41v (battery full). the pin configuration in low batt mode corresponds to the force discharge mode. 5.3 active modes the chip reacts to the trigger pin voltage. see 4.3. active modes . force charge continue charge force discharge continue discharge nimh pin is set according to vdd voltage. see 4.4. nimh pin . figure 3. operating modes vs battery voltage 1 1. typical values. switch on vdd switch off por hysteresis time safe active or sleep safe low batt low batt 1.05v 0.95v 0.9v 0.6v
www.semtech.com /products/ page 10 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. application examples 6 motor and led timers 6.1 dual slope controlled oscillator by connecting a capacitor between trigger and vss and resistors between pin trigger and pins charge and discharge, one builds an oscillator which ramp-down is controlled by rtdown*c and ramp-up by rtup*c. figure 4. oscillator controlled by two resistors - schematics figure 5. oscillator controlled by two resistors - waveform rtdown rtup ct trigger discharge charge nimh vdd motor vss led SX8122 123 4 1 2 led trigger on off burst burst motor vdd 2/3 vdd 1/3 vdd vss
www.semtech.com /products/ page 11 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. 6.2 single shot timer the same schematics without the reistor between tr igger and discharge will make a single shot timer controlled by rtup*c. figure 6. oscillator controlled by two resistors - schematics figure 7. oscillator controlled by two resistors - waveform rtup ct trigger discharge charge nimh vdd motor vss led SX8122 2 31 3 led trigger on off burst burst motor vdd 2/3 vdd 1/3 vdd vss
www.semtech.com /products/ page 12 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. 7power management the internal system goes in a safe mode (ios set as high impedance inputs) as long as the supply is below 0.6- 0.7 v. it starts reacting to trigger when the supply reaches 1.1 v and continues to operate until the supply goes back below 0.9v. when the supply goes be low 0.9v, it goes back to safe mode. see 5. operating modes . pin nimh goes high when vdd is below the nimh thre shold of ~1.41v and low when vdd is above the same threshold. pin nimh low means that if the power is coming from one nimh cell, this one is full. 7.1 low bat indicator for alkaline cell the SX8122 can be used to indicate low bat of an alkali ne cell, even when the cell voltage is below the led threshold voltage. it can either indicate it with a le d continuously on (simpler schematics, but is drains more current), or with a blinking led. figure 8. led is continuously on when th e supply voltage is below nimh threshold figure 9. led is blinking on when th e supply voltage is below nimh threshold 1.1 ? 1.7 v led alkaline trigger discharge charge nimh vdd motor vss led SX8122 trigger discharge charge nimh vdd motor vss led SX8122 led alkaline 1.1 ? 1.7 v
www.semtech.com /products/ page 13 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. mechanical specification 8packages 8.1 soic-8 8.1.1 outline drawing see detail detail a a .050 bsc .236 bsc 8 .010 .150 .189 .154 .193 .012 - 8 0.25 1.27 bsc 6.00 bsc 3.90 4.90 - .157 .197 3.80 4.80 .020 0.31 4.00 5.00 0.51 bxn 2x n/2 tips seating aaa c e/2 2x 12 n a d a1 e1 bbb c a-b d ccc c e/2 a2 (.041) .004 .008 - .028 - - - - 0 .016 .007 .049 .004 .053 8 0 0.20 0.10 - 8 0.40 0.17 1.25 0.10 .041 .010 .069 .065 .010 1.35 (1.04) 0.72 - 1.04 0.25 - - - 1.75 1.65 0.25 0.25 - .010 .020 0.50 - c l (l1) 01 0.25 gage plane h h 3. dimensions "e1" and "d" do not include mold flash, protrusions or gate burrs. -b- controlling dimensions are in millimeters (angles in degrees). datums and to be determined at datum plane notes: 1. 2. -a- -h- side view a b c d e h plane reference jedec std ms-012, variation aa. 4. l1 n 01 bbb aaa ccc a b a2 a1 d e e1 l h e c dim min millimeters nom dimensions inches min max max nom e
www.semtech.com /products/ page 14 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. 8.1.2 land pattern this land pattern is for reference purposes only. consult your manufact uring group to ensure your companys manufacturing guidelines are met. (.205) (5.20) z g y p (c) 3.00 .118 1.27 .050 0.60 .024 2.20 .087 7.40 .291 x inches dimensions z p y x dim c g millimeters this land pattern is for reference purposes only. consult your manufacturing group to ensure your company's manufacturing guidelines are met. notes: 1. reference ipc-sm-782a, rlp no. 300a. 2.
www.semtech.com /products/ page 15 advanced communications & sensing datasheet SX8122 1v motor/led timer acs - revision 2.2 august 2010 ? semtech corp. 8.1.3 marking information
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acs - revision 2.2 august 2010 ? semtech corp. www.semtech.com /products/ page 16 iso9001 certified semtech corporation advanced communications & sensing products contact information e-mail: sales@semtech.com or acsupport@semtech.com internet: http://www.semtech.com usa 200 flynn road, camarillo, ca 93012-8790. tel: +1 805 498 2111 fax: +1 805 498 3804 far east 12f, no. 89 sec. 5, nanking e. road, taipei, 105, twn, r.o.c. tel: +886 2 2748 3380 fax: +886 2 2748 3390 europe semtech ltd., units 2 & 3, park court, premier way, abbey park industrial estate, romsey, hampshire, so51 9dn. tel: +44 (0)1794 527 600 fax: +44 (0)1794 527 601 ? semtech 2010 all rights reserved. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not fo rm part of any quotation or contract, is believed to be accurate and reliable and may be chan ged without notice. no liability will be accepted by the publisher for any consequence of its use. publication thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. semtech assumes no responsibili ty or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to parameters beyond the specified maximum ratings or operation outside the specified range. semtech products are not designed, intended, authorized or warranted to be suitable for use in life- support applications, devices or systems or othe r critical applications. inclusion of semtech products in such applications is understood to be undertaken solely at the customers own risk. should a customer purchase or use semtech products for any such unauthorized application, the customer shall indemnify and hold semtech and its officers, employees, subsidiaries, affili ates, and distributors harmless against all claims, costs damages and atto rney fees which could arise. notice: all referenced brands, product names, service na mes and trademarks are the property of their respective owners. advanced communications & sensing datasheet SX8122 1v motor/led timer

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