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L9935
TWO-PHASE STEPPER MOTOR DRIVER
gerTpra'
TWO-PHASE STEPPER MOTOR DRIVER
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 40pA
n SERIAL INTERFACE (SPI)
BLOCK DIAGRAM
PowerSO20
ORDERING NUMBER: L9935
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.
DRIVER
OSCILLATOR
COMMON
LOGIC DIAGNOSTIC
BIASING
DRIVER
D99AT4 15
October 2002
PIN CONNECTION
GND 10 GND
OUTB1 9 SRB
a 8 OUTB2
CSN 7 CDRV
VCC 6 OSC
SDO 5 vs
SDI 4 N.C.
SCK 3 OUTA2
OUTA1 2 SRA
GND 1 GND
D99AT416
PIN FUNCTIONS
Pin N2 Name Description
1,10,11,20 GND Ground. (All ground pins are internally connected to the frame of the device).
2 OUTA1 Output 1 of full bridge 1
3 SCK Clock for serial interface (SPI)
4 SDI Serial data input
5 SDO Serial data output
6 VCC 5V logic suplly voltage
7 CSN Chip select (Low active)
8 a Enable (Low active)
9 OUTB1 Output 1 of full bridge 2
12 SR3 Cyrrent sense resistor of the chopper regulator for OUTB
13 OUTB2 Output 2 of full bridge 2
14 CDRV Charge pump buffer capacitor
15 OSC Oscillator capacitor or external clock
16 VS Supply voltage
17 NC Not connected
18 OUTA2 Output of full bridge 1
19 SRA Current sense resistor of the chopper regulator for OUTA
2/19 gr,
