LV8712T

Ordering number : ENA1674A LV8712T Overview Bi-CMOS LSI PWM Constant-Current Control Stepping Motor Driver The LV8712T is a stepping motor driver of the micro-step drive corresponding to supports 2W 1-2 phase excitation. It is the best for the drive of the stepping motor for a scanner and a small printer. Features • Single-channel PWM constant-current control stepping motor driver incorporated. • Excitation mode can be set to 2-phase, 1-2 phase, W1-2 phase , or 2W1-2 phase • Microstep can control easily by the CLK-IN input. • Power-supply voltage of motor : VM max = 18V • Output current : IO max = 0.8A • Output ON resistance : RON = 1.1Ω (upper and lower total, typical, Ta = 25°C ) • A thermal shutdown circuit and a low voltage detecting circuit are built into. Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Motor supply voltage Logic supply voltage Output peak current Output continuousness current Logic input voltage Allowable power dissipation Operating temperature Storage temperature Symbol VM max VCC max IO peak IO max VIN Pd max Topr Tstg * Each 1ch, tw ≤ 10ms, duty 20% Each 1ch Conditions Ratings 18 6 1.0 800 -0.3 to VCC + 0.3 1.35 -20 to +85 -55 to +150 Unit V V A mA V W °C °C * Specified circuit board : 57.0mm×57.0mm×1.7mm, glass epoxy 2-layer board. Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer' s products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer' s products or equipment. 20211 SY/51210 SY 20100216-S00005 No.A1674-1/14 LV8712T Allowable Operating Ratings at Ta = 25°C Parameter Motor supply voltage range Logic supply voltage range Logic input voltage VREF input voltage range Symbol VM VCC VIN VREF Conditions Ratings 4 to 16 2.7 to 5.5 -0.3 tp VCC+0.3 0 to VCC-1.8 Unit V V V V Electrical Characteristics at Ta = 25°C, VM = 12V, VCC = 3.3VVREF = 1.0V Parameter Standby mode current drain Symbol IMstn ICCstn Current drain IM ICC Thermal shutdown temperature Thermal hysteresis width VCC low voltage cutting voltage Low voltage hysteresis voltage REG5 output voltage Output on resistance TSD ΔTSD VthVCC VthHIS Vreg5 RonU RonD Output leakage current Diode forward voltage Logic pin input current IOleak VD IINL IINH Logic high-level input voltage Logic low-level input voltage VREF input current Current setting comparator threshold voltage (current step switching) 2W1-2-phase drive Vtdac1_2W Vtdac2_2W Vtdac3_2W Vtdac4_2W Vtdac5_2W Vtdac6_2W Vtdac7_2W W1-2-phase drive Vtdac2_W Vtdac4_W Vtdac6_W 1-2 phase drive Vtdac0_H Vtdac4_H 2 phase drive Current setting comparator threshold voltage (current attenuation rate switching) Vtdac4_F Vtatt00 Vtatt01 Vtatt10 Vtatt11 Chopping frequency CHOP pin threshold voltage Fchop VCHOPH VCHOPL CHOP pin charge/discharge current MONI pin saturation voltage Ichop Vsatmon Imoni = 1mA Vtdac0_W VINH VINL IREF Vtdac0_2W VREF = 1.0V Step 0 (When initialized : channel 1 comparator level) Step 1 (Initial state+1) Step 2 (Initial state+2) Step 3 (Initial state+3) Step 4 (Initial state+4) Step 5 (Initial state+5) Step 6 (Initial state+6) Step 7 (Initial state+7) Step 0 (When initialized : channel 1 comparator level) Step 2 (Initial state+1) Step 4 (Initial state+2) Step 6 (Initial state+3) Step 0 (When initialized : channel 1 comparator level) Step 4 (Initial state+1) Step 4' (When initialized : channel 1 comparator level) ATT1 = L, ATT2 = L ATT1 = H, ATT2 = L ATT1 = L, ATT2 = H ATT1 = H, ATT2 = H Cchop = 220pF 0.191 0.152 0.112 0.072 36 0.6 0.17 7 0.200 0.160 0.120 0.080 45 0.7 0.2 10 250 0.209 0.168 0.128 0.088 54 0.8 0.23 13 400 V V V V kHz V V μA mV 0.132 0.191 0.140 0.200 0.148 0.209 V V 0.175 0.132 0.068 0.191 0.184 0.140 0.076 0.200 0.193 0.148 0.084 0.209 V V V V 0.187 0.175 0.158 0.132 0.102 0.068 0.032 0.191 0.196 0.184 0.166 0.140 0.110 0.076 0.040 0.200 0.205 0.193 0.174 0.148 0.118 0.084 0.048 0.209 V V V V V V V V -0.5 0.191 0.2 0.209 IO = -1mA IO = -800mA, Source-side on resistance IO = 800mA, Sink-side on resistance VO = 15V ID = -800mA VIN = 0.8V VIN = 3.3V 4 22 2.0 0.8 1.0 8 33 Conditions min PS = “L”, no load PS = “L”, no load PS = “H”, no load PS = “H”, no load Design guarantee Design guarantee 2.1 100 4.5 0.3 0.9 0.5 1.3 180 40 2.4 130 5 0.78 0.32 2.7 160 5.5 1.0 0.43 10 1.2 12 45 Ratings typ max 1 1 0.7 1.7 μA μA mA mA °C °C V mV V Ω Ω μA V μA μA V V μA V Unit No.A1674-2/14 LV8712T Package Dimensions unit : mm (typ) 3260A 1.5 Pd max - Ta 6.5 24 13 Allowable power dissipation, Pd max - W 1.35 4.4 6.4 1.0 0.5 0.70 0.5 1 0.5 (0.5) 0.22 12 0.15 Specified circuit board : 57.0 × 57.0 × 1.7mm3 2-layer glass epoxy board 0 - 20 0 20 40 60 80 100 0.08 (1.0) 1.2max SANYO : TSSOP24(225mil) Ambient temperature, Ta - C Pin Assignment OUT1B OUT1A OUT2A OUT2B PGND RNF1 PGND RNF2 24 23 22 21 20 19 18 17 16 15 14 MD1 11 FR 13 LV8712T 1 2 3 4 5 6 7 8 9 10 12 CHOP VCC REG5 VREF MONI STEP ATT1 ATT2 GND OE RST PS MD2 VM No.A1674-3/14 Block Diagram RNF1 VM OUT2A OUT2B OUT1A OUT1B RNF2 + VM-5V standard voltage REG5 Standard voltage PGND Output preamplifier stage Output preamplifier stage Output preamplifier stage VCC Start circuit + + VREF + 1/5 Oscillation circuit Attenuator (100%/80% /60%/40%) Current selection (2W1-2/ W1-2/1-2/2) Output preamplifier stage LV8712T Output control logic + Current selection (2W1-2/ W1-2/1-2/2) MONI GND TSD LVS PS CHOP ATT1 ATT2 MD1 MD2 FR STEP RST OE No.A1674-4/14 LV8712T Pin Functions Pin No. 1 2 7 8 9 13 14 24 Pin Name RST OE STEP ATT1 ATT2 MD2 MD1 FR Pin Functtion Excitation reset signal input pin. Output enable signal input pin. STEP signal input pin. Motor holding current switching pin. Motor holding current switching pin. Excitation mode switching pin 2. Excitation mode switching pin 1. CW / CCW switching signal input pin. Equivalent Circuit VCC GND 4 PS Power save signal input pin. VCC 4 GND 16 17 18 20 21 23 OUT2B RNF2 OUT2A OUT1B RNF1 OUT1A Channel 2 OUTB output pin. Channel 2 current-sense resistor connection pin. Channel 2 OUTA output pin. Channel 1 OUTB output pin. Channel 1 current-sense resistor connection pin. Channel 1 OUTA output pin.Power VM 23 18 20 16 21 17 GND 6 VREF Constant current control reference voltage input pin. VCC 6 GND Continued on next page. No.A1674-5/14 LV8712T Continued from preceding page. Pin No. 3 Pin Name REG5 Pin Functtion Internal power supply capacitor connection pin. Equivalent Circuit VM 3 GND 5 MONI Position detection monitor pin. VCC 5 GND 10 CHOP Chopping frequency setting capacitor connection pin. VCC GND 10 No.A1674-6/14 LV8712T Description of operation Stepping motor control (1) Power save function This IC is switched between standby and operating mode by setting the PS pin. In standby mode, the IC is set to power-save mode and all logic is reset. In addition, the internal regulator circuit do not operate in standby mode. PS Low or Open High Mode Standby mode Operating mode Internal regulator Standby Operating (2) The order of turning on recommended power supply The order of turning on each power supply recommends the following. VCC power supply order → VM power supply order → PS pin = High It becomes the above-mentioned opposite for power supply OFF. However, the above-mentioned is a recommendation, the overcurrent is not caused by not having defended this, and IC is destroyed. (3) STEP pin function Input PS Low High High STP * Standby mode Excitation step proceeds Excitation step is kept Operating mode (4) Excitation mode setting function(initial position) MD1 MD2 Excitation mode Channel 1 Low High Low High Low Low High High 2 phase excitation 1-2 phase excitation W1-2 phase excitation 2W1-2 phase excitation 100% 100% 100% 100% Initial position Channel 2 -100% 0% 0% 0% This is the initial position of each excitation mode in the initial state after power-on and when the counter is reset. (5) Position detection monitoring function The MONI position detection monitoring pin is of an open drian type. When the excitation position is in the initial position, the MONI output is placed in the ON state. (Refer to "(12) Examples of current waveforms in each of the excitation modes.") No.A1674-7/14 LV8712T (6) Reset function RST High Low Operating mode Normal operation Reset state RST STEP MONI RESET 1ch output 0% 2ch output Initial position When the RST pin is set to Low, the excitation position of the output is forcibly set to the initial position, and the MONI output is placed in the ON state. When RST is then set to High, the excitation position is advanced by the next STEP input. (7) Output enable function OE Low High Operating mode Output ON Output OFF OE STEP MONI Power save mode 1ch output 0% 2ch output Output is high-impedance When the OE pin is set High, the output is forced OFF and goes to high impedance. However, the internal logic circuits are operating, so the excitation position proceeds when the STEP signal is input. Therefore, when OE is returned to Low, the output level conforms to the excitation position proceeded by the STEP input. No.A1674-8/14 LV8712T (8) Forward/reverse switching function FR Low High Operating mode Clockwise (CW) Counter-clockwise (CCW) FR CW mode CCW mode CW mode STEP Excitation position (1) (2) (3) (4) (5) (6) (5) (4) (3) (4) (5) 1ch output 2ch output The internal D/A converter proceeds by one bit at the rising edge of the input STEP pulse. In addition, CW and CCW mode are switched by setting the FR pin. In CW mode, the channel 2 current phase is delayed by 90° relative to the channel 1 current. In CCW mode, the channel 2 current phase is advanced by 90° relative to the channel 1 current. (9) Setting constant-current control The setting of STM driver's constant current control is decided the VREF voltage from the resistance connected between RNF and GND by the following expression. IOUT = (VREF/5)/RNF resistance * The above setting is the output current at 100% of each excitation mode. The voltage input to the VREF pin can be switched to four-step settings depending on the statuses of the two inputs, ATT1 and ATT2. This is effective for reducing power consumption when motor holding current is supplied. Attenuation function for VREF input voltage ATT1 Low High Low High ATT2 Low Low High High Current setting reference voltage attenuation ratio 100% 80% 60% 40% The formula used to calculate the output current when using the function for attenuating the VREF input voltage is given below. IOUT = (VREF/5) × (attenuation ratio)/RNF resistance Example : At VREF of 1.0V, a reference voltage setting of 100% [(ATT1, ATT2) = (L, L)] and an RNF resistance of 0.5Ω, the output current is set as shown below. IOUT = 1.0V/5 × 100%/0.5Ω = 400mA If, in this state, (ATT1, ATT2) is set to (H, H), IOUT will be as follows : IOUT = 400mA × 40% = 160mA In this way, the output current is attenuated when the motor holding current is supplied so that power can be conserved. No.A1674-9/14 LV8712T (10) Chopping frequency setting For constant-current control, this IC performs chopping operations at the frequency determined by the capacitor (Cchop) connected between the CHOP pin and GND. The chopping frequency is set as shown below by the capacitor (Cchop) connected between the CHOP pin and GND. Tchop ≒ C × V × 2 / I (s) V : Width of suresshu voltage, typ 0.5V I : Charge/discharge current, typ 10μA For instance, when Cchop is 200pF, the chopping frequency will be as follows : Fchop ≒ 1 / Tchop (Hz) (11) Output current vector locus (one step is normalized to 90 degrees) 100.0 θ0 θ1 θ2 θ3 θ4' (2-phase) Channel 1 phase current ratio (%) 66.7 θ4 θ5 θ6 33.3 θ7 0.0 0.0 θ8 33.3 66.7 100.0 Channel 2 current ratio (%) Setting current ration in each excitation mode STEP 2W1-2 phase (%) Channel 1 θ0 θ1 θ2 θ3 θ4 θ5 θ6 θ7 θ8 100 98 92 83 70 55 38 20 0 Channel 2 0 20 38 55 70 83 92 98 100 0 100 0 100 38 92 70 70 70 70 100 100 92 38 W1-2 phase (%) Channel 1 100 Channel 2 0 1-2 phase (%) Channel 1 100 Channel 2 0 2-phase (%) Channel 1 Channel 2 No.A1674-10/14 LV8712T (12) Typical current waveform in each excitation mode 2-phase excitation (CW mode) STEP MONI (%) 100 l1 0 -100 (%) 100 I2 0 -100 1-2 phase excitation (CW mode) STEP MONI (%) 100 I1 0 -100 (%) 100 I2 0 -100 No.A1674-11/14 LV8712T W1-2 phase excitation (CW mode) STEP MONI (%) 100 I1 0 -100 (%) 100 I2 0 -100 2W1-2 phase excitation (CW mode) STEP MONI (%) 100 50 I1 0 -50 -100 (%) 100 50 I2 0 -50 -100 No.A1674-12/14 LV8712T (13) Current control timing chart(Chopping operation) (Sine wave increasing direction) STEP Set current Set current Coil current Chopping cycle fchop BLANKING section BLANKING section Current mode CHARGE SLOW FAST CHARGE SLOW FAST (Sine wave decreasing direction) STEP Set current Coil current Set current Chopping cycle fchop BLANKING section Chopping cycle BLANKING section BLANKING section Current mode CHARGE SLOW FAST Forced CHARGE section FAST CHARGE SLOW In each current mode, the operation sequence is as described below : • At rise of chopping frequency, the CHARGE mode begins. (The Blanking section in which the CHARGE mode is forced regardless of the magnitude of the coil current (ICOIL) and set current (IREF) exists for 1μs.) • The coil current (ICOIL) and set current (IREF) are compared in this blanking time. When (ICOIL < IREF) state exists ; The CHARGE mode up to ICOIL ≥ IREF, then followed by changeover to the SLOW DECAY mode, and finally by the FAST DECAY mode for approximately 1μs. When (ICOIL < IREF) state does not exist ; The FAST DECAY mode begins. The coil current is attenuated in the FAST DECAY mode till one cycle of chopping is over. Above operations are repeated. Normally, the SLOW (+FAST) DECAY mode continues in the sine wave increasing direction, then entering the FAST DECAY mode till the current is attenuated to the set level and followed by the SLOW DECAY mode. No.A1674-13/14 LV8712T Application Circuit Example 1 2 3 Logic input Short-circuit state detection monitor -+ 1.0V Clock input 4 5 6 7 8 9 220pF 3.3V -+ 10 11 12 RST OE REG5 PS MONI VREF STEP ATT1 ATT2 CHOP VCC GND FR OUT1A PGND RNF1 OUT1B VM 24 23 22 21 20 19 +- Logic input The formulae for setting the constants in the examples of the application circuits above are as follows : Constant current (100%) setting When VREF = 1.0V IOUT = VREF/5/RNF resistance = 1.0V/5/0.51Ω = 0.392A Chopping frequency setting Fchop = Ichop/ (Cchop × Vtchop × 2) = 10μA/ (220pF × 0.5V × 2) = 45kHz SANYO Semiconductor Co.,Ltd. assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein. 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SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above. This catalog provides information as of February, 2011. Specifications and information herein are subject to change without notice. PS No.A1674-14/14 LV8712T 12V OUT2A 18 M RNF2 OUT2B PGND 17 16 15 MD1 14 Logic input MD2 13