RT8750 4+2 CH Motor Driver for DSC General Description The RT8750 is a 4+2 (two exclusive control modes) channel motor driver for DSC application. In total, it provides 4+1 full swing channels, 3+1 constant voltage channels, and 1 constant current channel. It includes dedicated control mode for stepping motors in 1-2 phase or 2-2 phase operation. The RT8750 also provides two photo-interrupters for motor position detection. The RT8750 can be controlled via 3 parallel input ports and a serial input interface. The voltage setting of the constant voltage drivers and the current setting of the constant current driver can be configured by 4-bit DACs via serial input interface. Other features include UVLO, thermal shutdown, power save mode, and software reset. Hence, the RT8750 can cover most of the motor applications in a DSC system. The RT8750 comes in a small WQFN-20L 3x3 package to save board space. Ordering Information RT8750 Package Type QW : WQFN-20L 3x3 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Features Built-in 4+1 Full-Swing Drivers Controlled by Serial or Parallel Input Data with Brake Function Built-in 3+1 Constant Voltage Drivers Controlled by Serial or Parallel Input Data with Brake Function Built-in 1 Constant Current Driver for Shutter or IRIS Application Low On-Resistance (1.2Ω Ω, Sum of Upper and Bottom Side Drivers) Output Current : IOUT ≤ 800mA per Channel CH1/2 STM Control Mode Operable in 2-2 Phase or 1-2 Phase CH13/23 Exclusive Control Mode (STM-2, CH5) CH35 Exclusive Control Mode (DCM, CH6) Built-in 2 PI Channels (for Photo Interrupter Driver) Built-in 4-Bit DAC Circuits Built-in Thermal Shutdown Protection Under Voltage Lockout Protection Power Save Mode Setup by Serial Input Data Constant Current Value Set by Serial Input Data 20-Lead WQFN Package RoHS Compliant and Halogen Free Applications DSC Note : Richtek products are : ` Pin Configurations (TOP VIEW) RoHS compliant and compatible with the current require- ` OUT3A OUT5A PI2 VCC IN1 ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. 20 19 18 17 16 K1= : Product Code K1=YM DNN YMDNN : Date Code 1 15 2 14 GND 3 4 21 5 13 12 11 6 7 8 IN2 IN3 VM PI1 SDAT 9 10 RNF4 OUT4B OUT4A CS SCLK Marking Information OUT3B OUT2B OUT2A OUT1B OUT1A WQFN-20L 3x3 DS8750-01 April 2011 www.richtek.com 1 RT8750 Typical Application Circuit RT8750 VCC Power Supply 5 OUT1A OUT1B 4 17 VCC 10µF 14 IN3 15 IN2 16 IN1 Parallel Control Signal AutoFocus ( STM-1 ) OUT2A 3 OUT2B 2 ZOOM/IRIS ( STM-2 ) MCU 9 CS 10 SCLK 11 SDAT Serial Control Signal OUT3A 20 OUT3B 1 ZOOM/IRIS ( DCM ) 19 ZOOM/IRIS ( DCM ) 13 VM VM Power Supply OUT5A 10µF RNF OUT4A 8 OUT4B 7 6 RNF4 12 18 PI1 GND PI2 Shutter ( COIL ) 21 (Exposed Pad) FS : Full-swing CV : Constant Voltage CC : Constant Current Serial Data Setup Timing <Timing of writing data to internal register> 16 bits of data sent after a rising edge of CS are latched and written to an internal register on a falling edge of CS. CS 16 bits D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 SDAT SCLK Figure 1. Input Setting of Serial Data 50% 50% CS D15 D14 D13 D1 D0 D15 D14 D13 50% SDAT SCLK D2 50% 50% Testd 60n Tholdd 20n Tsetc 30n Tsets Sclk 200n Tholdc 30n Tholds 100n Tnegs 200n Figure 2. Timing for Writing Serial Data www.richtek.com 2 DS8750-01 April 2011 RT8750 Functional Pin Description Pin No. Pin Name Pin Function OUT3B CH3 H-Bridge Output B Terminal. 2 OUT2B CH2 H-Bridge Output B Terminal. 3 OUT2A CH2 H-Bridge Output A Terminal. 4 OUT1B CH1 H-Bridge Output B Terminal. 5 OUT1A CH1 H-Bridge Output A Terminal. 6 RNF4 CH4 Current Detect Terminal for CC or FS Ground. 7 OUT4B CH4 H-Bridge Output B Terminal. 8 OUT4A CH4 H-Bridge Output A Terminal. 9 CS Serial Data Latch Control. 10 SCLK Serial Clock Input. 11 SDAT Serial Data Input. 12 PI1 PI1 Driver Output. 13 VM Power Supply for Motor Blocks. 14 IN3 Parallel Input Control. 15 IN2 Parallel Input Control. 16 IN1 Parallel Input Control. 17 VCC IC Analog Input Power Pin. 18 PI2 PI2 Driver Output. 19 OUT5A CH5 Push-pull Output A Terminal. 20 OUT3A CH3 H-Bridge Output A Terminal. Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation. CS IN1 IN2 IN3 VCC Function Block Diagram SCLK 21 (Exposed Pad) GND SDAT 1 Bias Low Voltage Detection TSD VREF PI1 4-bit DAC Control Logic PI2 VC4 VC3 VC12 Exclusive 2 GND OUT1A OUT1B 1CH FS/CV VM 2CH FS/CV OUT2A Exclusive 1 OUT2B OUT3A 3CH FS/CV OUT3B 5CH FS/CV OUT5A OUT4B DS8750-01 April 2011 OUT4A RNF4 4CH FS/CC www.richtek.com 3 RT8750 Absolute Maximum Ratings (Note 1) Supply Input Voltage, VCC, VM (Note 2) ------------------------------------------------------------------------Control Input Voltage (Note 2) --------------------------------------------------------------------------------------Direct Current, IOD ------------------------------------------------------------------------------------------------------Instantaneous Output Current, IOP -----------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C WQFN-20L 3x3 ----------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 3) WQFN-20L 3x3, θJA ----------------------------------------------------------------------------------------------------WQFN-20L 3x3, θJC ----------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------Junction Temperature --------------------------------------------------------------------------------------------------Storage Temperature Range ------------------------------------------------------------------------------------------ESD Susceptibility (Note 4) HBM -----------------------------------------------------------------------------------------------------------------------MM -------------------------------------------------------------------------------------------------------------------------- Recommended Operating Conditions −0.3V to 6V −0.3V to VCC 600mA/CH 800mA/CH 1.471W 68°C/W 7.5°C/W 260°C 150°C −65°C to 150°C 2kV 200V (Note 5) Supply Input Voltage, VCC -------------------------------------------------------------------------------------------Supply Input Voltage, VM ---------------------------------------------------------------------------------------------Junction Temperature Range -----------------------------------------------------------------------------------------Ambient Temperature Range ------------------------------------------------------------------------------------------ 2.5V to 5.5V 3V to 5.5V −40°C to 125°C −40°C to 85°C Electrical Characteristics (VCC = 3.3V, VM = 5V, TA = 25°C, unless otherwise specified) Parameter Power Supply Current VCC Standby Current Symbol Test Conditions Min Typ Max Unit ICC0 PS1 = Low, all input pin open -- 3 10 μA VM Standby Current IM01 PS1 = Low -- 0.1 5 μA Consuming Current when Driver Operation ICC1 PS1 = High, All CH drivers in operation PI1 to PI2 ON, no load -- 0.6 2 -- 0.6 2 2 -- -- -- -- 0.8 VCC x 0.6 -- -- -- -- VCC x 0.5 -- 2 6 μA IN1 to IN3 Input Threshold Voltage CS, SDAT, SCLK Input Threshold Voltage IM1 Logic-High VIH Logic-Low VIL VCC = 2.7 to 3.6V Logic-High VIH Logic-Low VIL SDAT, SCLK, IN1 to 3 Sink Current CS Sink Current mA V V VCC > 2V -- 6 20 μA VCC, UVLO Threshold VUVLO VM = 5V 1.55 1.65 1.8 V VCC, POR Threshold VPOR VM = 5V 1.8 2 2.2 V RON1 VM = 5V, IOUT = 100mA sum of on-resistance -- 1.2 1.6 Ω CH1, CH2, CH3, CH5 On-Resistance 1 To be continued www.richtek.com 4 DS8750-01 April 2011 RT8750 Parameter Symbol On-Resistance 2 RON2 Constant Voltage Output VOUT Test Conditions VM = 3V, I OUT = 100mA sum of on-resistance DAC accuracy with no load between a setting output and GND Min Typ Max Unit -- 1.5 2 Ω −5 0 5 % -- 1.1 1.4 Ω -- 1.3 1.8 Ω 190 200 210 mA Constant Current Driver (CH4) IOUT = 100mA VRNF4 = 0V VM = 5V, sum of on resistance IOUT = 100mA VRNF4 = 0V VM = 3V, sum of on resistance RNF4 = 1Ω VM = 5V DAC : 200mV On-Resistance 1 RION1 On-Resistance 2 RION2 Constant Current Accuracy (200mA) IOUT_ACC RNF4 Voltage1 VRNF1 RNF4 = 1Ω DAC : 300mV −5 0 5 % RNF4 Voltage2 VRNF2 RNF4 = 1Ω DAC : 150mV −8 0 8 % On-Voltage VPION IOUT_ACC = 30mA -- 0.2 0.4 V Off-State Leakage Current Thermal Shutdown Temperature IOFF −2 0 2 μA 125 160 -- °C Thermal Shutdown Hysteresis ΔTSD VCC ≥ PIOUT Chip temperature when the H-bridge output turns OFF. Hysteresis temperature when the H-bridge output returns ON. -- 20 - °C PI Driver TSD Serial Control Pin SCLK Frequency fsclk -- 5 6.2 MHz CS Setup Time tsets 200 -- -- ns CS Hold Time tholds 100 -- -- ns CS Negate Time tnegs 200 -- -- ns SDAT Setup Time tsetd 60 -- -- ns SDAT Hold Time thold 20 -- -- ns Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. As a rule, do not apply reverse power supply voltages. Note 3. θJA is measured in natural convection at TA = 25°C on a high-effective thermal conductivity four-layer test board of JEDEC 51-7 thermal measurement standard. The measurement case position of θJC is on the exposed pad of the package. Note 4. Devices are ESD sensitive. Handling precaution is recommended. Note 5. The device is not guaranteed to function outside its operating conditions. DS8750-01 April 2011 www.richtek.com 5 RT8750 Applications Information Serial Control Register Map No. Address b15 b14 b13 b12 b11 A0 0 0 A1 0 1 A2 1 0 A3 1 1 b10 b9 b8 b7 Data b6 b5 b4 b3 b2 b1 b0 CH1/2/3 CH3/5 PI1 PI2 CH1/2 CH3 CH4 exclusive exclusive control control control mode control mode control mode control control CH1/2 CH3/5 CH3/5 CH1/2 DAC CH3 DAC Input pin select CV/FS CV/FS Disable CH4 CH4 CH4 DAC No use No use Disable CC/FS CH3 CH4 CH1/2 CH1/2 , CH13/23 S/W serial serial CH1/2 No use PS1 DCM/ serial control input Reset control input control input disable STM IN1A IN1B IN2A IN2B IN3A IN3B IN4A IN4B Note : FS : Full Swing, CC : Constant Current, CV : Constant Voltage www.richtek.com 6 S/W Reset (Serial Control) Internal Logic 0 Enable (Input signal readable) 1 Initial clear (Software reset) DS8750-01 April 2011 RT8750 Serial Control Function Table Address <0 0> CH 1, 2, 3, 4 Control Mode Setup/PI Control No. Address Data b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 A0 0 0 CH1/2 control mode 0 0 0 CH3 control mode 0 0 The lower shows the initial value of each register Data bit Bit name b13 to b11 CH1/2 control mode select b10 to b8 CH3 control mode select b7 to b5 CH4 mode setup b4 CH3/5 exclusive control b3 PI1 control b2 PI2 control b1 to b0 CH1/2/3 exclusive control 0 b5 CH4 control mode 0 0 0 b4 b3 b2 b1 b0 CH1/2/3 CH3/5 PI2 PI1 exclusive exclusive control control control control 0 0 0 0 0 Function CH1/2 control mode select 000 : PWM Mode1 001 : PWM Mode2 010 : PWM Mode3 011 : PWM Mode4 100 : Serial mode 101 : Set prohibition (CH1/2 Hi-Z) 110 : CH1/2 3 lines control (STM 1-2 phase drive) 111 : CH1/2 2-lines control (STM 2-2 phase drive) CH3 control mode select 000 : PWM Mode1 001 : PWM Mode2 010 : PWM Mode3 011 : PWM Mode4 100 : Serial mode 101 : Parallel mode 110 : Set prohibition (CH3 Hi-Z) 111 : Set prohibition (CH3 Hi-Z) CH4 control mode select 000 : PWM Mode1 001 : PWM Mode2 010 : PWM Mode3 011 : PWM Mode4 100 : Serial mode 101 : Parallel mode 110 : Set prohibition (CH4 Hi-Z) 111 : Set prohibition (CH4 Hi-Z) 0: Normal mode 1: CH3/5 exclusive control mode 0: OFF (Output = Hi-Z) 1: ON (Output = L) 0: OFF (Output = Hi-Z) 1: ON (Output = L) 00 : Normal mode 01 : CH13 Exclusive control mode 10 : CH23 Exclusive control mode 11 : CH13/23 Exclusive control mode Note : CH1/2 can't support parallel mode. DS8750-01 April 2011 www.richtek.com 7 RT8750 Address <0 1> CH1, 2, 3 DAC & mode setup/Input pin select No. Address Data b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 A1 0 CH1/2 DAC 1 0 0 Data bit 0 CH3 DAC 0 0 0 0 0 b5 b4 b3 b2 b1 b0 CH1/2 CH3 CH3/5 Input pin select CV/FS CV/FS Disable 0 0 0 0 0 0 Bit name b13 to b10 CH1/2 constant voltage value setup 1.80 to 4.80V, 0.2V/bit b9 to b6 CH3 constant voltage value setup 1.80 to 4.80V, 0.2V/bit b5 CH1/2 CV/FS drive mode setup* b4 CH3/5 CV/FS drive mode setup* b3 CH3/5 disable setting b2 to b0 Input PIN selection 0000 : 4.80V 0001 : 4.60V 0010 : 4.40V 0011 : 4.20V 0100 : 4.00V 0101 : 3.80V 0110 : 3.60V 0111 : 3.40V 0000 : 4.80V 0001 : 4.60V 0010 : 4.40V 0011 : 4.20V 0100 : 4.00V 0101 : 3.80V 0110 : 3.60V 0111 : 3.40V CH1/2 drive mode setup 0 : Constant voltage 1 : Full swing Function 1000 : 3.20V 1001 : 3.00V 1010 : 2.80V 1011 : 2.60V 1100 : 2.40V 1101 : 2.20V 1110 : 2.00V 1111 : 1.80V 1000 : 3.20V 1001 : 3.00V 1010 : 2.80V 1011 : 2.60V 1100 : 2.40V 1101 : 2.20V 1110 : 2.00V 1111 : 1.80V CH3/5 drive mode setup 0 : Constant voltage 1 : Full swing CH3/5 disable setting 0 : Disable 1 : Enable Defined by input pin selection table * : When A0, b [1 , 0] = 01, 10 or 11 If A1, b[5] was set to “1”, then A1, b[4] must also be set to “1”. Input pin selection table Serial Data Bit Input Pin b2 b1 b0 IN1 IN2 IN3 0 0 0 CH1 CH2 CH3 0 0 1 CH1 CH2 CH4 0 1 0 IN1A IN1B IN2A 0 1 1 IN3A IN3B CH4 1 0 0 IN4A IN4B CH3 1 0 1 IN1A IN1B CH4 1 1 0 IN2A IN2B CH4 www.richtek.com 8 DS8750-01 April 2011 RT8750 Address <1 0> CH4 DAC & mode setup No. Address b15 b14 b13 b12 b11 b10 A2 1 b9 b8 CH4 DAC 0 0 0 Data bit b7 No use 0 0 0 0 0 CH4 constant current value setup (RNF voltage) b9 to b6 No Use b5 CH4 disable setting b4 CH4 CC/FS drive mode b3 to b0 No Use 0 Data bit b2 b1 b0 No use 0 0 0 0 Set prohibition CH1/2, CH13/23 serial control input 1 b3 Function 1000 : 220mV 1001 : 210mV 1010 : 200mV 1011 : 190mV 1100 : 180mV 1101 : 170mV 1110 : 160mV 1111 : 150mV 0000 : 300mV 0001 : 290mV 0010 : 280mV 0011 : 270mV 0100 : 260mV 0101 : 250mV 0110 : 240mV 0111 : 230mV Set prohibition CH4 disable setting 0 : Disable 1 : Enable CH4 drive mode setup 0 : Constant current 1 : Full swing Address <1 1> Serial data select/Power save/Reset control No. Address b15 b14 b13 b12 b11 b10 b9 b8 b7 1 0 b5 b4 CH4 CH4 Disable CC/FS 0 0 Bit name b13 to b10 A3 Data b6 0 0 0 Data b6 CH3 serial CH4 serial control input control input 0 0 0 0 b5 b4 No use 0 0 b3 PS1 0 b2 b1 b0 CH1/2 S/W CH1/2 DCM/ Reset disable STM 0 0 0 Function b13 : IN1A b12 : IN1B b13 to b10 CH1/2 serial input b11 : IN2A b10 : IN2B b9 : IN3A b9 to b8 CH3 serial input b8 : IN3B b7 : IN4A b7 to b6 CH4 serial input b6 : IN4B b5 to b4 No use Set prohibition 0 : All motor channels OFF b3 PS1 (Power Saving) 1 : All motor channels ON CH1/2 setting b2 CH1/2 disable* 0 : Disable 1 : Enable 0 : DC motor control b1 CH1/2 DCM/STM 1 : STM control 0 : Nothing is done b0 S/W Reset 1 : RESET * (CH1/2 mode setup = 110, 111), (CH1/2 mode setup = 100 and A3 bit1 = “1”) DS8750-01 April 2011 Bit name www.richtek.com 9 RT8750 Serial and Parallel Control Function Table * : Channel number (* = 1 or 2...) # : Define by “input pin selection table” X : Don't care, H : HIgh level, L : Low level PWM Mode 1 Serial Control Input IN*A IN*B 0 0 0 1 0 1 1 0 1 0 1 1 Input Terminal IN# X L H L H X Output Terminal OUT*A OUT*B Z Z L L H L L L L H L L PWM Mode 2 Serial Control Input IN*A IN*B 0 0 0 1 0 1 1 0 1 0 1 1 Input Terminal IN# X L H L H X Output Terminal OUT*A OUT*B Z Z H L L L L H L L L L PWM Mode 3 Serial Control Input IN*A IN*B X 0 0 1 0 1 1 1 Input Terminal IN# X L H X Output Terminal OUT*A OUT*B Z Z L H H L L L PWM Mode 4 Serial Control Input IN*A IN*B X 0 Input Terminal IN# X Output Terminal OUT*A OUT*B Z Z 0 0 1 www.richtek.com 10 1 1 1 L H X H L L L H L Mode Off Brake Forward Brake Reverse Brake Mode Off Forward Brake Reverse Brake Brake Mode Off Reverse Forward Brake Mode Off Forward Reverse Brake DS8750-01 April 2011 RT8750 Serial Mode Serial Control Input IN*A IN*B 0 0 0 1 1 0 1 1 Parallel Mode Input Terminal IN# (IN*A) IN# (IN*B) L L H L L H H H Output Terminal OUT*A OUT*B Z Z H L L H L L Mode Off Forward Reverse Brake Output Terminal OUT*A OUT*B Z Z H L L H L L Mode Off Forward Reverse Brake CH1/2 3-lines stepping motor control (1-2 phase control) Input pin selection table = 010; CH1/2 disable = 1 Input Terminal Output Terminal Mode IN1A (IN1) IN1B (IN2) IN2A (IN3) OUT1A OUT1B OUT2A OUT2B CH1 CH2 H L L L L H H H H H H L L L L H L H L H L H L H H Z L L L Z H H L Z H H H Z L L H H H Z L L L Z L L L Z H H H Z Forward Off Reverse Reverse Reverse Off Forward Forward Forward Forward Forward Off Reverse Reverse Reverse Off CH1/2 2-lines stepping motor control (2-2 phase control) Input pin selection table = 010 Input Terminal Output Terminal Mode IN1A (IN1) IN1B (IN2) OUT1A OUT1B OUT2A OUT2B CH1 CH2 H L L H H H L L H L L H L H H L H H L L L L H H Forward Reverse Reverse Forward Forward Forward Reverse Reverse DS8750-01 April 2011 www.richtek.com 11 RT8750 CH1/2 More control Mode of Stepping Motor Input terminal PWM control (STM 1-2 phase control) CH1/2 mode setup = 000 : PWM Mode 1 Serial Control Input bit IN1A IN1B IN2A IN2B 0 0 0 0 0 1 0 1 0 0 0 1 1 0 0 1 1 0 0 0 1 0 1 0 0 0 1 0 0 1 1 0 0 1 0 0 0 1 0 1 0 0 0 1 1 0 0 1 1 0 0 0 1 0 1 0 0 0 1 0 0 1 1 0 0 1 0 0 Input Terminal IN1 IN2 X X H H X H H H H X H H X H H H H X L L X L L L L X L L X L L L L X Output Terminal OUT1A OUT1B OUT2A OUT2B Z Z Z Z H L H L Z Z H L L H H L L H Z Z L H L H Z Z L H H L L H H L Z Z L L L L Z Z L L L L L L L L Z Z L L L L Z Z L L L L L L L L Z Z Mode CH1 Off Forward Off Reverse Reverse Reverse Off Forward Forward Brake Off Brake Brake Brake Off Brake Brake CH2 Off Forward Forward Forward Off Reverse Reverse Reverse Off Brake Brake Brake Off Brake Brake Brake Off Input terminal PWM control (STM 2-2 phase control) CH1/2 mode setup = 000 : PWM Mode 1 Serial Control Input bit Input Terminal IN1A IN1B IN2A IN2B IN1 IN2 0 0 0 0 X X 0 1 0 1 H H 1 0 0 1 H H 1 0 1 0 H H 0 1 1 0 H H 0 1 0 1 L L 1 0 0 1 L L 1 0 1 0 L L 0 1 1 0 L L www.richtek.com 12 Output Terminal OUT1A OUT1B OUT2A OUT2B Z Z Z Z H L H L L H H L L H L H H L L H L L L L L L L L L L L L L L L L Mode CH1 Off Forward Reverse Reverse Forward Brake Brake Brake Brake CH2 Off Forward Forward Reverse Reverse Brake Brake Brake Brake DS8750-01 April 2011 RT8750 Input terminal forward/reverse control (STM 2-2 phase drive) CH1/2 mode setup = 010 : PWM Mode 3 Serial Control Input bit IN1A IN1B IN2A IN2B Input Terminal IN1 IN2 Output Terminal OUT1A OUT1B OUT2A OUT2B Mode CH1 CH2 0 0 0 0 X X Z Z Z Z Off Off 0 1 0 1 H H H L H L Forward Forward 0 1 0 1 L H L H H L Reverse Forward 0 1 0 1 L L L H L H Reverse Reverse 0 1 0 1 H L H L L H Forward Reverse Serial Control (STM 1-2 phase control) CH1/2 mode setup = 100 : serial mode; DCM/STM mode setup = 1 (IN1A, IN1B, IN2A) = (1, 1, 0) (0, 1, 0) (0, 0, 0) (1, 0, 0) = STM 2-2 phase control Serial Control Input bit IN1A IN1B IN2A 1 1 0 0 1 1 0 1 0 0 0 1 0 0 0 1 0 1 1 0 0 1 1 1 OUT1A H Z L L L Z H H Output Terminal OUT1B OUT2A L H Z H H H H Z H L Z L L L L Z Mode OUT2B L L L Z H H H Z CH1 Forward OFF Reverse Reverse Reverse Off Forward Forward CH2 Forward Forward Forward Off Reverse Reverse Reverse Off CH1/2/3, CH3/5 Exclusive control function table OUT1A OUT1B OUT2A OUT2B OUT3A OUT3B OUT5A STM-1 DCM-1 OUT1A OUT1B OUT2A OUT2B OUT3A OUT3B OUT5A STM-1 DCM-2 DCM-3 DCM-3 STM-2 Figure 3. CH1/3, CH2/3, CH3/5 exclusive control mode Figure 4. CH1/2/3, CH3/5 exclusive control mode Note 6. The CH1/3 exclusive mode constitutes one DCM motor and the electrical current in the OUT1A → OUT3A direction is assigned as“forward direction”. Note 7. The CH2/3 exclusive mode constitutes one DCM motor and the electrical current in the OUT2A → OUT3B direction is assigned as “forward direction”. Note 8. The CH3/5 exclusive mode constitutes one DCM motor and the electrical current in the OUT3A → OUT5A direction is assigned as “forward direction”. Note 9. The CH13/23 exclusive mode constitutes one STM motor and the electrical current in the OUT1A OUT3A and OUT2A → OUT3B direction is assigned as “forward direction”. DS8750-01 April 2011 www.richtek.com 13 RT8750 CH13 Exclusive Control Function Table PWM Mode 1 Serial Control Input IN1A Input Terminal IN1B Output Terminal IN# OUT1A OUT3A Mode 0 0 0 1 1 0 1 1 0 0 X L H L H Z L H L L Z L L L H Off Brake Forward Brake Reverse 1 1 X L L Brake PWM Mode 2 Serial Control Input IN1A Input Terminal IN1B Output Terminal IN# OUT1A OUT3A Mode 0 0 0 1 X L Z H Z L Off Forward 0 1 1 1 0 0 H L H L L L L H L Brake Reverse Brake 1 1 X L L Brake PWM Mode 3 Serial Control Input IN1A Input Terminal IN1B Output Terminal IN# OUT1A OUT3A Mode X 0 0 1 X L Z L Z H Off Reverse 0 1 1 1 H X H L L L Forward Brake PWM Mode 4 Serial Control Input IN1A Input Terminal IN1B Output Terminal IN# OUT1A OUT3A Mode X 0 0 1 X L Z H Z L Off Forward 0 1 1 1 H X L L H L Reverse Brake Serial Mode Serial Control Input IN1A IN1B Output Terminal OUT1A OUT3A Mode 0 0 0 1 Z H Z L Off Forward 1 1 0 1 L L H L Reverse Brake www.richtek.com 14 DS8750-01 April 2011 RT8750 Parallel Mode Input Terminal IN# (IN1A) L H L H IN# (IN1B) L L H H Output Terminal OUT1A OUT3A Z H L L Z L H L Mode Off Forward Reverse Brake CH23 Exclusive Control Function Table PWM Mode 1 Serial Control Input IN2A IN2B Input Terminal Output Terminal IN# OUT2A OUT3B Mode 0 0 0 1 X L Z L Z L Off Brake 0 1 1 1 0 0 H L H H L L L L H Forward Brake Reverse 1 1 X L L Brake PWM Mode 2 Serial Control Input IN2A IN2B Input Terminal Output Terminal IN# OUT2A OUT3B Mode 0 0 0 1 X L Z H Z L Off Forward 0 1 1 1 0 0 H L H L L L L H L Brake Reverse Brake 1 1 X L L Brake PWM Mode 3 Serial Control Input IN2A IN2B Input Terminal Output Terminal IN# OUT2A OUT3B Mode X 0 0 1 X L Z L Z H Off Reverse 0 1 1 1 H X H L L L Forward Brake PWM Mode 4 Serial Control Input IN2A IN2B Input Terminal Output Terminal IN# OUT2A OUT3B Mode X 0 0 1 X L Z H Z L Off Forward 0 1 1 1 H X L L H L Reverse Brake DS8750-01 April 2011 www.richtek.com 15 RT8750 Serial Mode Serial Control Input IN2A IN2B Output Terminal OUT2A OUT3B Mode 0 0 0 1 Z H Z L Off Forward 1 1 0 1 L L H L Reverse Brake Parallel Mode Input Terminal IN# (IN1A) Output Terminal IN# (IN1B) OUT2A OUT3B Mode L H L L Z H Z L Off Forward L H H H L L H L Reverse Brake CH13/23 Exclusive Control Function Table CH13/23 3-lines stepping motor control (1-2 phase control) Input pin selection table = 010; CH1/2 disable = 1 Input Terminal Output Terminal Mode IN1A (IN1) IN1B (IN2) IN2A (IN3) OUT1A OUT3A OUT2A OUT3B CH13 CH23 H H L H L H L Forward Forward L H H Z Z H L Off Forward L H L L H H L Reverse Forward L L H L H Z Z Reverse Off L H L L L H L Z H Z L L H H Reverse Off Reverse Reverse H L L H L L H Forward Reverse H H H H L Z Z Forward Off CH13/23 2-lines stepping motor control (2-2 phase control) Input pin selection table = 010 Input Terminal Output Terminal Mode IN1A (IN1) IN1B (IN2) OUT1A OUT3A OUT2A OUT3B CH13 CH23 H H H L H L Forward Forward L H L H H L Reverse Forward L L L H L H Reverse Reverse H L H L L H Forward Reverse www.richtek.com 16 DS8750-01 April 2011 RT8750 More Control Mode of Stepping Motor Input terminal PWM control (STM 1-2 phase control) CH1/2 mode setup = 000 : PWM Mode 1 Serial Control Input bit Input Terminal IN1A IN1B IN2A IN2B IN1 IN2 0 0 0 0 X X 0 1 0 1 H H 0 0 0 1 X H 1 0 0 1 H H 1 0 0 0 H X 1 0 1 0 H H 0 0 1 0 X H 0 1 1 0 H H 0 1 0 0 H X 0 1 0 1 L L 0 0 0 1 X L 1 0 0 1 L L 1 0 0 0 L X 1 0 1 0 L L 0 0 1 0 X L 0 1 1 0 L L 0 1 0 0 L X Output Terminal OUT1A OUT3A OUT2A OUT3B Z Z Z Z H L H L Z Z H L L H H L L H Z Z L H L H Z Z L H H L L H H L Z Z L L L L Z Z L L L L L L L L Z Z L L L L Z Z L L L L L L L L Z Z Mode CH13 Off Forward Off Reverse Reverse Reverse Off Forward Forward Brake Off Brake Brake Brake Off Brake Brake Output Terminal OUT1A OUT3A OUT2A OUT3B Z Z Z Z H L H L L H H L L H L H H L L H L L L L L L L L L L L L L L L L Mode CH13 CH23 Off Off Forward Forward Reverse Forward Reverse Reverse Forward Reverse Brake Brake Brake Brake Brake Brake Brake Brake CH23 Off Forward Forward Forward Off Reverse Reverse Reverse Off Brake Brake Brake Off Brake Brake Brake Off Input terminal PWM control (STM 2-2 phase control) CH1/2 mode setup = 000 : PWM Mode 1 Serial Control Input bit Input Terminal IN1A IN1B IN2A IN2B IN1 IN2 0 0 0 0 X X 0 1 0 1 H H 1 0 0 1 H H 1 0 1 0 H H 0 1 1 0 H H 0 1 0 1 L L 1 0 0 1 L L 1 0 1 0 L L 0 1 1 0 L L DS8750-01 April 2011 www.richtek.com 17 RT8750 Input terminal forward/reverse (STM 2-2 phase control) CH1/2 mode setup = 010 : PWM Mode 3 Serial Control Input bit Input Terminal IN1A IN1B IN2A IN2B IN1 IN2 Output Terminal OUT1A OUT3A OUT2A OUT3B Mode CH13 CH23 0 0 0 0 X X Z Z Z Z Off Off 0 1 0 1 H H H L H L Forward Forward 0 1 0 1 L H L H H L Reverse Forward 0 1 0 1 L L L H L H Reverse Reverse 0 1 0 1 H L H L L H Forward Reverse Serial Control (STM 1-2 phase drive) CH1/2 mode setup = 100 : serial mode; DCM/STM mode setup = 1 Serial Control Input bit Output Terminal Mode IN1A IN1B IN2A OUT1A OUT3A OUT2A OUT3B CH13 CH23 1 0 0 0 0 1 1 1 1 1 1 0 0 0 0 1 0 1 0 1 0 1 0 1 H Z L L L Z H H L Z H H H Z L L H H H Z L L L Z L L L Z H H H Z Forward OFF Reverse Reverse Reverse Off Forward Forward Forward Forward Forward Off Reverse Reverse Reverse Off CH3/5 Exclusive Control Function Table PWM Mode 1 Serial Control Input Input Terminal IN3A IN3B Output Terminal IN# OUT3A OUT5A Mode 0 0 0 1 X L Z L Z L Off Brake 0 1 1 1 0 0 H L H H L L L L H Forward Brake Reverse 1 1 X L L Brake PWM Mode 2 Serial Control Input IN3A IN3B Input Terminal Output Terminal IN# OUT3A OUT5A Mode 0 0 0 1 X L Z H Z L Off Forward 0 1 1 1 0 0 H L H L L L L H L Brake Reverse Brake 1 1 X L L Brake www.richtek.com 18 DS8750-01 April 2011 RT8750 PWM Mode 3 Serial Control Input IN3A Input Terminal IN3B Output Terminal IN# OUT3A OUT5A Mode X 0 0 1 X L Z L Z H Off Reverse 0 1 1 1 H X H L L L Forward Brake PWM Mode 4 Serial Control Input IN3A Input Terminal IN3B Output Terminal IN# OUT3A OUT5A Mode X 0 0 1 X L Z H Z L Off Forward 0 1 1 1 H X L L H L Reverse Brake Serial Mode Serial Control Input IN3A IN3B Output Terminal OUT3A OUT5A Mode 0 0 0 1 Z H Z L Off Forward 1 1 0 1 L L H L Reverse Brake Parallel Mode Input Terminal IN# (IN1A) IN# (IN1B) Output Terminal OUT3A OUT5A Mode L H L L Z H Z L Off Forward L H H H L L H L Reverse Brake DS8750-01 April 2011 www.richtek.com 19 RT8750 Address = A0 b1 0 0 1 1 Mode b0 0 1 0 1 Normal CH13 Exclusive CH23 Exclusive CH13/23 Exclusive 10µF Application Circuit Application for type 1 to 2 Application for type 3 Application for type 4 10µF 10µF VM VCC IN1 DCM OUT1B OUT2A OUT1A VM VCC OUT1A IN2 10µF IN1 OUT1B OUT2A IN2 OUT2B DCM IN3 OUT2B OUT3A IN3 DCM OUT3A DCM CS CS OUT3B DCM SCLK OUT5A OUT4A SDAT OUT4B DCM OUT3B SCLK DCM DCM / Shutter OUT5A OUT4A SDAT Figure 5. Application for Type 1 Figure 7. Application for Type 3 10µF 10µF VM VCC OUT1B OUT2A IN2 VM IN1 STM OUT2B OUT3A IN3 10µF VCC OUT1A IN1 CS OUT3B SCLK OUT5A OUT4A IN2 OUT2B OUT3A STM-2 OUT3B CS SCLK DCM OUT5A OUT4A SDAT OUT4B Figure 6. Application for Type 2 20 STM-1 IN3 DCM GND www.richtek.com OUT1A OUT1B OUT2A DCM SDAT OUT4B GND GND 10µF STM-1 GND OUT4B Figure 8. Application for Type 4 DS8750-01 April 2011 RT8750 Outline Dimension 1 1 2 2 DETAIL A Pin #1 ID and Tie Bar Mark Options Note : The configuration of the Pin #1 identifier is optional, but must be located within the zone indicated. Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 0.700 0.800 0.028 0.031 A1 0.000 0.050 0.000 0.002 A3 0.175 0.250 0.007 0.010 b 0.150 0.250 0.006 0.010 D 2.900 3.100 0.114 0.122 D2 1.650 1.750 0.065 0.069 E 2.900 3.100 0.114 0.122 E2 1.650 1.750 0.065 0.069 e L 0.400 0.350 0.016 0.450 0.014 0.018 W-Type 20L QFN 3x3 Package Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 5F, No. 95, Minchiuan Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)86672399 Fax: (8862)86672377 Email: [email protected] Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek. DS8750-01 April 2011 www.richtek.com 21