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부품번호 | 1334 기능 |
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기능 | STEPPER MOTOR CONTROLLERS | ||
제조업체 | STMicroelectronics | ||
로고 | |||
전체 11 페이지수
L297
L297D
STEPPER MOTOR CONTROLLERS
NORMAL/WAWE 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
DIP20
SO20
ORDERING NUMBERS : L297 (DIP20)
L297D (SO20)
DESCRIPTION
The L297/A/D Stepper Motor Controller IC gener-
ates four phase drive signals for two phase bipolar
and four phase unipolar step motors in microcom-
puter-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 this device is that it requires only clock,
direction and mode input signals. Since the phase
are generated internally the burden on the micro-
processor, 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.
ABSOLUTE MAXIMUM RATINGS
Symbol
Vs
Vi
Ptot
Tstg, Tj
Parameter
Supply voltage
Input signals
Total power dissipation (Tamb = 70°C)
Storage and junction temperature
TWO PHASE BIPOLAR STEPPER MOTOR CONTROL CIRCUIT
Value
10
7
1
-40 to + 150
Unit
V
V
W
°C
August 1996
1/11
L297-L297D
PIN FUNCTIONS - L297/L297D (continued)
N° NAME
FUNCTION
19
HALF/FULL
Half/full step select input. When high selects half step operation,
when low selects full step operation. One-phase-on full step mode
is obtained by selecting FULL when the L297’s translator is at an
even-numbered state.
Two-phase-on full step mode is set by selecting FULL when the
translator is at an odd numbered position. (The home position is
designate state 1).
20
RESET
Reset input. An active low pulse on this input restores the
translator to the home position (state 1, ABCD = 0101).
THERMAL DATA
Symbol
Rth-j-amb
Parameter
Thermal resistance junction-ambient
DIP20 SO20 Unit
max 80
100 °C/W
CIRCUIT OPERATION
The 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 generatesthree
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’senable
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 configurationsthis
technique reduces dissipation in the load current
sense resistors.
A common on-chip oscillator drives the dual chop-
per.It suppliespulses 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
windingsis programmedby a voltage divideron 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.
4/11
4페이지 ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test conditions
Ileak Leakage current (pin 3)
VCE = 7 V
Vsat Saturation voltage (pin 3)
I = 5 mA
Voff Comparators offset voltage
(pins 13, 14, 15)
Vref = 1 V
Io Comparator bias current
(pins 13, 14, 15)
Vref Input reference voltage (pin 15)
tCLK Clock time
tS Set up time
tH Hold time
tR Reset time
tRCLK Reset to clock delay
L297-L297D
Min.
Typ Max. Unit
1 µA
0.4 V
5 mV
-100
10 µA
0 3V
0.5 µs
1 µs
4 µs
1 µs
1 µs
Figure 1.
7/11
7페이지 | |||
구 성 | 총 11 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |