L9935 Datasheet, PDF (1/19 Pages) STMicroelectronics – TWO-PHASE STEPPER MOTOR DRIVER

®
L9935
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 40µA
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.
1
GND
~
20
GND
19
SR_A
2
OUT_A1
3
SCK
4
SDI
5
SDO
6
VCC
7
CSN
8
EN
DRIVER
LOGIC
COMMON
LOGIC
OSCILLATOR
DIAGNOSTIC
BIASING
18
OUT_A2
17 N.C.
16
V_S
15
OSC
14
C_DRV
9
OUT_B1
10
GND
November 1999
DRIVER
LOGIC
~
13
OUT_B2
12
SR_B
11
GND
D99AT415
1/19