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L6515 dual dc-motor positioning system advance data precise operation also with low cost optical encoder pwm - output for digital switched power bridges direction indicator for easy posi- tion counting with m p external loop gain and transfer functional adjustment parallel addressed inputs with latch 44 lead plcc package description the L6515 is a monolithic integrated circuit in bcd-technology assembled in a plcc-44 plastic chip carrier. the device contains all functions for a complete dual dc-motor positioning system. for the motor driver stage only digital switched bridges are needed. useful are l293e, l298, l6203 and l6202. the device is intended to drive dc-motors in typewrit- ers, printers, plotters and general purpose indus- trial applications. this is advanced information on a new product now in development or undergoing evaluation. details are subject to change without notice. may 1994 system block diagram (one channel) plcc44 ordering number: L6515 multipower bcd techno logy 1/13
system description the L6515 is intended to be used as a microproc- essor controlled positioning system. for the motor driver stage only digital operating bridges are needed like l293e, l298, l6203, l6202. the system operates in two modes to achieve high-speed, high-accurancy positioning. speed commands for the system originate in the microprocessor. it is continuously updated on the motor position by means of pulses from the con- troller chip, which in turn gets its information from the encoder. from this basic input, the microproc- essor computes a 6-bit control word that sets the system speed and direction dependent on the dis- tance to travel. when the motor is stopped and the microproces- sor orders it to a new position, the system oper- ates initially in an open-loop configuration as there is no feedback from the tachometer gener- ator. therefore maximum current is fed to the mo- tor. as maximum speed is reached, the tachome- ter chip output backs off the processors signal thus reducing accelerating torque. the motor con- tinues to run at top speed but under closed-loop control. as a target position is approached, the microproc- essor lowers the value of the speed-demand word; this reduces the voltage at the main sum- ming point, in effect braking the motor. the brak- ing is applied progressively until the motor is run- ning at minimum speed. at that time, the microprocessor orders a switch to the position mode, and within 3 to 4ms the power stage drives the motor to a null position, where it is held by electronic "detening". symbol parameter value unit v s supply voltage 12 v v ia analog inputs voltage -0.3 to 7 v v il logic inputs voltage -0.3 to 7 v v o open collector output current 12 v i o open collector current 10 ma i z zener current 20 ma t stg , tj storage temperature -40 to 150 c t amb operative ambient temperature 0 to 70 c absolute maximum ratings pin connection (top view) lai L6515 2/13
pin name description 1 lcsg load current decoder sens reference ground 2v z zener clamp 3,43 lcdi load current decoder input 4,42 lcdo load current decoder output 5,41 eao error amplifier output for current mode pwm modulator 6,40 eai error amplifier input for current mode pwm modulator 7,39 tso tacho signal output 8,38 tspo tacho signal processor output 9,37 tspi tacho signal processor input 10,36 pwmn current mode pwm output inverted 11,35 pwm current mode pwm output non inverted 12,34 dio direction indicator digital open collector output. a low level is cw, a high level is ccw operation of the motor 13,33 pco position counter digital open collector output 14,32 pso phase selector output for signal differentation 15,31 poso positioning output. the output becomes activated via position adress decoder. 16,30 ftb analog input from position encoder phase b. proposed operation range is 2.8v + 1v. 17,29 fta analog input from position encoder phase a. proposed operation range is 2.8v + 1v 18 ref master current reference 19 osc oscillator 20,21 dai decoder logic input for latch select + reset 22 gnd major and logic ground 23 to 28 lai latch adress input 44 v s supply voltage pin functions L6515 3/13
schematic diagram L6515 4/13
application circuit L6515 5/13
symbol parameter pin test condition min. typ. max. unit v s operating supply voltage range 7 11 v i s quiescent supply current 50 ma v z zener voltage i z =1ma 8,5 9.9 11,4 v i z operating zener current 1 ma electrical characteristics (refer to test circuit, v s =10v, i ref =300 m a, t amb =25 c unless otherwise specified) v i operating input voltage range a/d/1/2 referred to v ref -1,65 +1,65 v i i input bias current 1 m a v os input-output offset voltage between a/d/1/2 and f/1/2 s3 or s4 closed i o =0 15 mv s1 or s2 closed i o =0 v in =v ref 20 mv v sat output saturation voltage b/c/1/2 i o =1.4ma 0.4 v i oh output leakage current 10 m a v th threshold hysteresis voltage between a/1/2 and b/1/2 d/1/2 and c/1/2 80 150 mv r on output resistance on state e/f/1/2 one of s1 to s6 closed 150 300 w v ol output operating low voltage e/f/1/2 referred to v ref i o =1ma -1.2 v v oh output operating high voltage +1.2 v position encoder section L6515 6/13
symbol parameter pin test condition min. typ. max. unit v i input voltage g/1/2 gain=1 referred to v ref -1.65 +1.65 v i i input bias current 1 m a v ol output operating low voltage h/1/2 referred to v ref -1.62 v i/1/2 io=1ma s7 closed -1.3 v oh output operating low voltage i/1/2 +1.3 h/1/2 +1.62 r on output resistance on state i1/2 s7 or s7 closed 150 260 w v os input offset voltage h1/2 v in =v ref s7 closed i o = 0 20 mv v os input offset voltage g1/2 referred to v ref g1/2 shorted to h1/2 20 mv r mo output matching resistance i1/2 s7 or s7 closed 0.8 1.2 w tacho signal processing section v i input voltage j1/2 gain=1 1 4.6 v i i input bias current 1 m a v o l lower clamping voltage k1/2 i o =1ma refered to v ref -1.45 -1.22 v v oh higher clamping voltage +1.06 +1.56 v v os input offset voltage j1/2 referred to v ref k1/2 j1/2 shorted 20 mv error amplifier section v os output offset voltage l1/2 n1/2=0 referred to v ref 140 mv r out output resistance 0.5 1.7 k w v clh current limit threshold o1/2 p1/2 referred to v ref 0.5 v v cdo differential output offset voltage l1/2 v off(+) - v off(-) 20 mv current decoder section L6515 7/13
symbol parameter pin test condition min. typ. max. unit v h upper triangle threshold referred to v ref +1.2 +1.8 v v l lower triangle threshold -1.6 -1.3 v i cd charge/discharge current i ref =500 m a 160 180 m a v o pwm output voltage o1/2 i o =1.4ma 0.4 v p1/2 2.7 oscillator -pwm sections i ref current reference input range z 0.3 0.7 ma i o sink and source output current j1/2 i ref =0.5 ma 918 968 1018 m a v ref reference voltage z i ref =20 m a 2.7 2.8 2.9 v i o linearity error j1/2 i ref =0.5 ma 1.61 /fs dac section v inl input low voltage r s -0.3 0.8 v v inh input high voltage t u 27v i l input v w -10 m a i h input high current high voltage x y 30 m a input logic section L6515 8/13
truth table tacho-encoder logic pdib > pdia c 1 = high pdib < pdia c 1 = low pdib > pdia c2 = high pdib < pdia c2 = low input signal c1 c2 closed s2 position l h s1 tspo hhs2 tspo h l s3 tspo lls4 tspo switch signal application circuit L6515 9/13
truth table logic selection chip address terminals functions rs l l no action h l strobe latch 1 l h strobe latch 2 h h reset latch 1/2 decoder address latch address timing diagram of counter and direction indication logic L6515 10/13
position encoder main advantage of the operation principle of the positioning system is that a high performance po- sition encoder is not required. the system accepts several phases and ampli- tude errors of the encoder output signal without affecting the system performance. two position sensors are useful. 1) optical-encoder with ir-led and phototransistor 2) magnetic encoder with hall-effect sensors the allowed spread of the encoder out put signal refer to reference level is shown in fig.3. figure 3. figure 2. figure 1. L6515 11/13
plcc44 package mechanical data dim. mm inch min. typ. max. min. typ. max. a 17.4 17.65 0.685 0.695 b 16.51 16.65 0.650 0.656 c 3.65 3.7 0.144 0.146 d 4.2 4.57 0.165 0.180 d1 2.59 2.74 0.102 0.108 d2 0.68 0.027 e 14.99 16 0.590 0.630 e 1.27 0.050 e3 12.7 0.500 f 0.46 0.018 f1 0.71 0.028 g 0.101 0.004 m 1.16 0.046 m1 1.14 0.045 L6515 12/13
information furnished is believed to be accurate and reliable. however, sgs-thomson microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of sgs-thomson microelectronics. specifications men- tioned in this publi cation are subject to change without not ice. this publication sup ersedes and replaces all information previously supplied. sgs-thomson microelectronics products are not authorized for use as critical components in life support dev ices or systems without ex- press written approval of sgs-thomson microelectronics. ? 1994 sgs-thomson microelectronics - all rights reserved sgs-thomson microelectronics group of companies aust ralia - brazil - france - germany - hong kong - italy - japan - korea - malaysia - malta - morocco - the netherlands - singapore - spain - sweden - switzerland - taiwan - thaliand - united k ingdom - u.s.a. L6515 13/13

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