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                2 X 1.1A FULL BRIDGE OUTPUTS
                INTEGRATED CHOPPING CURRENT REGU-
                LATION
                MINIMIZED POWER DISSIPATION DURING
                FLYBACK
                OUTPUT STAGES WITH CONTROLLED
                OUTPUT VOLTAGE SLOPES TO REDUCE
                ELECTROMAGNETIC RADIATION
                SHORT-CIRCUIT PROTECTION OF ALL
                OUTPUTS
                ERROR-FLAG FOR OVERLOAD, OPEN LOAD
                AND OVERTEMPERATURE PREALARM
                DELAYED CHANNEL SWITCH-ON TO RE-
                DUCE PEAK CURRENTS
                MAX. OPERATING SUPPLY VOLTAGE 24V
                STANDBY CONSUMPTION TYPICALLY 40
                μ
                A
                SERIAL INTERFACE (SPI)
                DESCRIPTION
                The L9935 is a two-phase stepper motor driver
                circuit suited to drive bipolar stepper motors. The
                device can be controlled by a serial interface
                (SPI). All protections required to design a well
                protected system (short-circuit, overtemperature,
                cross conduction etc.) are integrated.
                April 2003
                .
                COMMON
                LOGIC
                OSCILLATOR
                DIAGNOSTIC
                BIASING
                DRIVER
                LOGIC
                DRIVER
                LOGIC
                ~
                ~
                D99AT415
                GND
                20
                1
                GND
                19
                SR
                A
                18
                17
                OUT
                A2
                16
                V
                S
                N.C.
                15
                OSC
                14
                C
                DRV
                13
                OUT
                B2
                12
                SR
                B
                11
                GND
                OUT
                A1
                2
                SCK
                3
                EN
                8
                CSN7
                VCC
                6
                SDO
                5
                SDI
                4
                OUT
                B1
                9
                GND
                10
                BLOCK DIAGRAM
                PowerSO20
                ORDERING NUMBER: L9935
                L9935
                TWO-PHASE STEPPER MOTOR DRIVER
                1/19
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