L297 ,STEPPER MOTOR CONTROLLERSL297®STEPPER MOTOR CONTROLLERSNORMAL/WAVE DRIVEHALF/FULL STEP MODESCLOCKWISE/ANTICLOCKWISE DIRECTIO ..
L297/1 ,STEPPER MOTOR CONTROLLERSL297®STEPPER MOTOR CONTROLLERSNORMAL/WAVE DRIVEHALF/FULL STEP MODESCLOCKWISE/ANTICLOCKWISE DIRECTIO ..
L297D ,STEPPER MOTOR CONTROLLERSL297®STEPPER MOTOR CONTROLLERSNORMAL/WAVE DRIVEHALF/FULL STEP MODESCLOCKWISE/ANTICLOCKWISE DIRECTIO ..
L297D013TR ,STEPPER MOTOR CONTROLLERSBLOCK DIAGRAM (L297/1 - L297D)2/11L297PIN FUNCTIONS - L297/1 - L297DN NAME FUNCTION°1 SYNC Output o ..
L297D013TR ,STEPPER MOTOR CONTROLLERSL297®STEPPER MOTOR CONTROLLERSNORMAL/WAVE DRIVEHALF/FULL STEP MODESCLOCKWISE/ANTICLOCKWISE DIRECTIO ..
L298 ,DUAL FULL-BRIDGE DRIVERELECTRICAL CHARACTERISTICS (V = 42V; V = 5V, T = 25°C; unless otherwise specified)S SS jSymbol Para ..
LB11967V-TLM-H , For Variable Speed Fan Motor Single-Phase Full-Wave Pre-Driver
LB11967V-TLM-H , For Variable Speed Fan Motor Single-Phase Full-Wave Pre-Driver
LB11975 ,High-Speed CD-ROM Spindle Motor Driver ICElectrical Characteristics at Ta = 25°C, V 1 = 5 V, V 2 = V = 12 VCC CC SRatingsParameter Symbol Co ..
LB11983 ,Sensorless Motor Drivers i3-phase bipolarj: Refrigerator fan motor driverAbsolute Maximum Ratings at Ta = 25°CParameter Symbol Conditions Ratings UnitSupply voltage V max 1 ..
LB11985 ,VCR Capstan Motor Brushless Motor DriverElectrical Characteristics at Ta = 25°C, V = 5 V, V = 15 VCC SRatingsParameter Symbol Conditions Un ..
LB11988 ,Refrigerator Fan Motor DriverElectrical Characteristics at Ta = 25°C, V = 12 V, V = 12 VCC S RatingsParameter Symbol Conditions ..
L297-L297D013TR
STEPPER MOTOR CONTROLLERS
L297STEPPER MOTOR CONTROLLERS
NORMAL/WAVE DRIVE
HALF/FULL STEP MODES
CLOCKWISE/ANTICLOCKWISE DIRECTION
SWITCHMODE LOAD CURRENT REGULA-
TION
PROGRAMMABLE LOAD CURRENT
FEW EXTERNAL COMPONENTS
RESET INPUT & HOME OUTPUT
ENABLE INPUT
DESCRIPTIONThe L297 Stepper Motor Controller IC generates
four phase drive signals for two phase bipolar and
four phase unipolar step motors in microcomputer-
controlled applications. The motor can be driven in
half step, normal and wawe drive modes and on-
chip PWM chopper circuits permit switch-mode
control of the current in the windings. A feature of
December 2001
ABSOLUTE MAXIMUM RATINGSthis device is that it requires only clock, direction
and mode input signals. Since the phase are gen-
erated internally the burden on the microprocessor,
and the programmer, is greatly reduced. Mounted
in DIP20 and SO20 packages, the L297 can be
used with monolithic bridge drives such as the
L298N or L293E, or with discrete transistors and
darlingtons.
TWO PHASE BIPOLAR STEPPER MOTOR CONTROL CIRCUIT1/11
PIN CONNECTION (T op view)
BLOCK DIAGRAM (L297/1 - L297D)2/11
L297
PIN FUNCTIONS - L297/1 - L297D3/11
L297
PIN FUNCTIONS - L297/1 - L297D (continued)
CIRCUIT OPERATIONThe L297 is intended for use with a dual bridge
driver, quad darlington array or discrete power
devices in step motor driving applications. It re-
ceives step clock, direction and mode signals from
the systems controller (usually a microcomputer
chip) and generates control signals for the power
stage.
The principal functions are a translator, which gen-
erates the motor phase sequences, and a dual
PWM chopper circuit which regulates the current in
the motor windings. The translator generates three
different sequences, selected by the HALF/FULL
input. These are normal (two phases energised),
wave drive (one phase energised) and half-step
(alternately one phase energised/two phases en-
ergised). Two inhibit signals are also generated by
the L297 in half step and wave drive modes. These
signals, which connect directly to the L298’s enable
inputs, are intended to speed current decay when
a winding is de-energised. When the L297 is used
to drive a unipolar motor the chopper acts on these
lines.
An input called CONTROL determines whether the
chopper will act on the phase lines ABCD or the
inhibit lines INH1 and INH2. When the phase lines
are chopped the non-active phase line of each pair
(AB or CD) is activated (rather than interrupting the
line then active). In L297 + L298 configurations this
technique reduces dissipation in the load current
sense resistors.
A common on-chip oscillator drives the dual chop-
per. It supplies pulses at the chopper rate which set
the two flip-flops FF1 and FF2. When the current in
a winding reaches the programmed peak value the
voltage across the sense resistor (connected to
one of the sense inputs SENS1 or SENS2) equals
Vref and the corresponding comparator resets its
flip flop, interrupting the drive current until the next
oscillator pulse arrives. The peak current for both
windings is programmed by a voltage divider on the
Vref input.
Ground noise problems in multiple configurations
can be avoided by synchronising the chopper os-
cillators. This is done by connecting all the SYNC
pins together, mounting the oscillator RC network
on one device only and grounding the OSC pin on
all other devices.
THERMAL DATA4/11
L297
MOTOR DRIVING PHASE SEQUENCESThe L297’s translator generates phase sequences
for normal drive, wave drive and half step modes.
The state sequences and output waveforms for
these three modes are shown below. In all cases
the translator advances on the low to high transis-
tion of CLOCK.
Clockwise rotation is indicate; for anticlockwise ro-
tation the sequences are simply reversed RESET
restores the translator to state 1, where ABCD =
HALF STEP MODE
Half step mode is selected by a high level on the HALF/FULL input.
NORMAL DRIVE MODE
Normal drive mode (also called "two-phase-on" drive) is selected by a low level on the HALF/FULL input
when the translator is at an odd numbered state (1, 3, 5 or 7). In this mode the INH1 and INH2 outputs
remain high throughout.
5/11
L297
MOTOR DRIVING PHASE SEQUENCES (continued)WAVE DRIVE MODE
Wave drive mode (also called "one-phase-on" drive) is selected by a low level on the HALF/FULL input
when the translator is at an even numbered state (2, 4, 6 or 8).
ELECTRICAL CHARACTERISTICS (Refer to the block diagram Tamb = 25°C, Vs = 5V unless otherwisespecified)
6/11
L297
