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FD0252B fd0256b smart motor driver with embedded hall sensor this datasheet contains new product information. f eeling technology reserves the rights to modify the product specification without notice. no liability is assumed as a result of the use of t his product. no rights under any patent accompany t he sales of the product. rev1.9 dec. 18, 2008 p.1 feeling technology features motor driver with integrated hall sensor high current driving capability lock-shutdown protection & auto-restart function built-in rd(rotation detection) signal output soft-switch phase-switching technique to reduce v ibration and acoustic noise thermal shutdown protection pwm speed control(only available for fd0256b) available in both t825(FD0252B) and t826(fd0256b) p ackages general description FD0252B/fd0256b is a single coil motor driver with embedded hall sensor. it integrates the motor drive r with the hall sensor, which simplifies the pcb(printed circuit board) design and make the fabrication of small-si ze motors possible. lock-shutdown and auto-restart function keeps the m otor from being over-heated and restarts the motor after being locked. FD0252B/fd0256b is built-in the signal output of ro tation detection function, the system could detect the rotation status from this signal of motor when using FD0252B /fd0256b. soft-switch phase-switching technique is used to r educe the vibration and acoustic noise. thermal-shutdown protection ensures the motor drive r to operate under specified temperature ranges. all the protection mechanisms mentioned above combin e to provide a complete protecting scenario for the motor system, keep the motor system from possible damages and guarantee correct operations. block diagram figure.1 halogen free bias generator coil driver oscillator hall plate reset power-on digital control logics chopper amplifier pwm control
FD0252B fd0256b rev1.9 dec. 18, 2008 p.2 feeling technolo gy pin connection figure.2 pin descriptions legend: i=input, o=output, i/o=input/output, p=powe r supply, g=ground functional descriptions refer to the block diagram (figure.1), FD0252B/fd02 56b is composed of the following building blocks: bias generator the bias generator provides precise, temperature- a nd process-insensitive bias references for the anal og blocks. these references guarantee proper operation of the ic under all conditions specified in this specifica tion. oscillator the built-in oscillator provides the clock signal f or the digital control logics power-on reset used to detect the power-up ramp and reset the digi tal circuits to achieve correct operation as soon a s the power is ready. chopper amplifier to achieve a higher magnetic sensitivity the choppe r amplifier structure is adopted in this design. us e of this structure dynamically removes both the offset and f licker noise at the same time. digital control logics hall sensor part C generates controlling signals f or the hall sensor. coil driver part C generates controlling signals f or the coil driver. signal part Cgenerates an output signal of the rota tion detection(rd). name i/o FD0252B fd0256b description rd o 1 1 rotation detection vss g 2 2 ground no o 3 3 driver output so o 4 4 driver output vdd p 5 5 positive power supply pwm i - 6 pulse width modulation speed control vdd so no vss rd c 1 2 3 4 5 e g pwm so no vss rd c 1 2 3 4 6 d g 5 vdd FD0252B fd0256b
FD0252B fd0256b rev1.9 dec. 18, 2008 p.3 feeling technolo gy pwm control pwm(pulse-width modulation) is used for the speed c ontrol for fd0256b. 2 types of pwm input signals ca n be used : 1. voltage mode pwm : applying a constant(dc) voltage to the pwm pin and t he fd0256b will generate pwm pulses internally with the on duty cycle ratio according to the diagram below(figure.3), which can be utilized by the user to control the speed of the motor. the rotation speed will be higher if the voltage applied to the pwm pin is hig her. figure.3 2. pulse mode pwm : user can also apply pwm pulses directly to the pwm pin. the fd0256b will pass this pulse to the coil d river with the original duty-cycle ratio. note: (1) this function is only available for fd0256b. (2) while using pulse mode pwm, the high value of the input pulse should be higher than 0.5*vdd and t he low value should be lower than 0.14*vdd. (3) the lower-limit for the pwm pulse frequency is 200hz, and the recommended frequency range is highe r than 30khz where the pwm input pulses will not gener ate acoustic noise. note. the pwm pin contains an internal pull-up resisto r so the fd0256b will rotate at full-speed(100% on) when this pin is left un-connected(floating) . "on" ratio 0.14 vdd 0.5 vdd 0% 100%
FD0252B fd0256b rev1.9 dec. 18, 2008 p.4 feeling technolo gy absolute maximum ratings values parameter symbol conditions min. typ. max. unit operating temperature t op - -20 105 storage temperature t st - -40 150 dc supply voltage v dd , v rd - 6.5 v pwm high - >0.5v dd 6.5 v pwm voltage range pwm low - 0 <0.14v dd v supply current i dd - 3 ma continuous current i cont - 500 ma hold current i hold - 800 ma rd pin sink current i rd - 25 ma junction temperature t j - 170 p dt825 - 500 mw maximum power dissipation p dt826 - 520 mw t825 0.291 /mw thermal resistance (note1) ja t826 0.280 /mw t825 0.023 /mw thermal resistance (note1) jc t826 0.020 /mw magnetic flux density b unlimited gauss ir-reflow lead temperature t p 10sec 260 note1: device mounted with copper area of approximately 10 mm 2, 1?z, no air flow. (room temperature: 25 ) figure.4 figure.5 figure.6 255 5 o c 10 1 sec 150 10 o c 90 30 sec 2~5 o c /sec 2~5 o c /sec second ir-reflow soldering condition room temp 0 25 50 75 100 125 150 326 412 500 pd (mw) temp. ( ) o c t825 power dissipation curve 175 240 154 68 0 105 o c 170 o c 0 25 50 75 100 125 150 339 428 520 pd (mw) temp. ( ) o c t826 power dissipation curve 175 250 160 71 0 105 o c 170 o c
FD0252B fd0256b rev1.9 dec. 18, 2008 p.5 feeling technolo gy recommended operating conditions values parameter conditions min. typ. max. unit supply voltage - 1.8 5.5 v ambient temperature - -10 90 electrical characteristics v dd =5.0v, t a =25 (unless otherwise specified) values parameter conditions min. typ. max. unit average supply current(no load) 1.8 ma output saturation voltage(rd) i rd = 10ma 0.5 v output leakage current(rd) v rd =5v 1 a on resistance(rpmos+rnmos) 0.8 thermal shutdown threshold 165 magnetic characteristics values parameter conditions min. typ. max. unit operate points ( b op ) 25 g release points ( b rp ) -25 g hysteresis 50 g hysteresis characteristics figure.7 no so v brp bop b brp bop v b
FD0252B fd0256b rev1.9 dec. 18, 2008 p.6 feeling technolo gy application circuit reference figure.8 note : must use c1 capacitor for the decoupling between v dd and v ss and place the capacitor as close to the ic as possible. 1. zd1: v dd over-voltage stress protection diode. 2. r2: current limit resistor for open drain rd out put. 3. r3: pwm pull-up resistor for open drain pwm sourc e signal. 4. r4: de-coupling resistor for long-distance signa l transmission. mlcc (0603) 2.2uf/6.3v vdd 4.7 ohm (0603) vdd so no vss rd ce 1 2 3 5 4 r1 c1 d1 schottky diode 0.2v zd1 6.5v l1 r2 100 ohm (0603) mlcc (0603) 2.2uf/6.3v vdd 4.7 ohm (0603) vdd so no vss rd cd 1 2 3 6 4 r1 c1 d1 schottky diode 0.2v zd1 6.5v l1 r2 100 ohm (0603) pwm 5 r4 r3 1k ohm (0603) fd0256b FD0252B g g option component
FD0252B fd0256b rev1.9 dec. 18, 2008 p.7 feeling technolo gy output waveforms description figure.9 fd0252/0256b operation waveforms descripti on note : 1. rd is an open drain output and the high level of th e signal depends on the external supply voltage. 2. the on torque time of motor is same as the re-st art time.
FD0252B fd0256b rev1.9 dec. 18, 2008 p.8 feeling technolo gy fd0252/0256 output waveforms measurement figure.10 normal operation waveforms (FD0252B / fd0 256b full speed mode) figure.11 soft-switching waveforms (FD0252B / fd025 6b full speed mode) ch1: no output ch2: so output ch4: input current ch1: rd output ch2: no output ch3: so output ch4: input current
FD0252B fd0256b rev1.9 dec. 18, 2008 p.9 feeling technolo gy figure.12 rotor lock and release waveforms (FD0252B / fd0256b full speed mode) ch1: rd output ch2: no output ch3: so output ch4: input current
FD0252B fd0256b rev1.9 dec. 18, 2008 p.10 feeling technolo gy package dimension (unit:mm) t825 dimension in millimeters symbols min nom max a 1.05 1.20 1.35 a1 0.05 0.10 0.15 a2 1.00 1.10 1.20 b 0.25 - 0.50 c 0.08 - 0.20 d 2.80 2.90 3.10 e 2.90 3.10 3.30 e1 1.50 1.60 1.70 e 0.95bsc e1 1.90bsc l 0.50 0.65 0.80 l1 0.80bsc l2 0.25bsc 0? 5? 10? 1 3? 5? 7? 2 6? 8? 10? sensor location 0.86mm 1.02mm top view: marking side
FD0252B fd0256b rev1.9 dec. 18, 2008 p.11 feeling technolo gy package dimension(unit:mm) t826 dimension in millimeters symbols min nom max a - - 1.45 a1 - - 0.15 a2 0.90 1.15 1.30 b 0.30 - 0.50 c 0.08 - 0.22 d 2.90bsc e 3.10bsc e1 1.60bsc e 0.95bsc e1 1.90bsc l 0.50 0.65 0.80 l1 0.80bsc l2 0.25bsc r 0.10 - - r1 0.10 - 0.25 0? 4? 8? 1 5? 10? 15? sensor location 0.86mm 1.02mm top view: marking side
FD0252B fd0256b rev1.9 dec. 18, 2008 p.12 feeling technolo gy packing specification (tapping reel) t825,t826
FD0252B fd0256b rev1.9 dec. 18, 2008 p.13 feeling technolo gy packing quantity specification 4,000ea / 1 reel 2 reels / 1 inside box 4 inside boxes / 1 outside box ic pin connection ic date code distinguish part number lot number year mass production version so no vdd gnd rd so no vdd gnd rd pwm FD0252B fd0256b c e g c g d g halogen free order information part number package moq marking msl FD0252Bvr-g1 t825 4,000ea / reel cexxxxg fd0256bvr-g1 t826 4,000ea / reel cdxxxxg 3

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