LC898240 Datasheet, PDF (8/23 Pages) ON Semiconductor – Smooth Stepper Motor Controller

LC898240
Continued from preceding page
Parameter
Symbol
MOTOR SIGNAL INPUTS (OUTAI, OUTBI)
Condition
Min
Typ
Max
Unit
Input voltage range
VOUTI
Ta: -40 to 85°C
0
AVDD
V
AMPLIFIER OUTPUT (AMPO)
Output voltage range
VAMPO
Ta: -40 to 85°C
0
AVDD
V
Maximum gain
GHAMPO
Ta = 25°C
16
V/V
Minimum gain
GLAMPO
Ta = 25°C
1
V/V
ADC INPUTS (ADCI)
Input voltage range
VADCI
Ta: -40 to 85°C
0
AVDD
V
ADC offset error
ILADCI
ADC differential
non-linearity
DILADCI
REFERENCE VOLTAGE INPUT (VREFI)
Ta = 25°C
Ta = 25°C
±2.0
LSB
±1.0
LSB
Input voltage range
VVREFI
Ta: -40 to 85°C
AVDD AVDD
V
REFERENCE VOLTAGE OUTPUT (VREFO)
Output voltage range
DAC integral
non-linearity
DAC differential
non-linearity
VVREFO
INLVREFO
DNLVREFO
Ta: -40 to 85°C
AVDD = 3.3V
VREFI = 3.3V
Ta = 25°C
Ta = 25°C
0.24
3.07
V
±2.0
LSB
±1.0
LSB
DAC zero scale voltage VZVREFO
Ta = 25°C
0.14
0.24
0.34
V
DAC full scale voltage
VFVREFO
Ta = 25°C
2.97
3.07
3.17
V
2. Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted.
Product performance may not be indicated by the Electrical Characteristics if operated under different conditions.
FUNCTIONAL DESCRIPTON
Control Functions
LC898240 provides the following control functions.
(1) Driver Control: It controls a stepper motor driver
connected to LC898240.
(2) Programmable Speed Control: The step pulses
are generated based on the target speed and
acceleration/deceleration curve.
(3) Smooth Current Control: The motor driving
current is adapted against the load, and it gives
high power efficiency.
Power On/Off
Ideally, he power should be supplied to DVDD1, AVDD,
DVDD2 and driver at the same time. But, if the
simultaneity is impossible, the power-on sequence must
be conformed to the following order within 100ms.
DVDD1 > AVDD > DVDD2 > driver
The power-off should also be done at the same time as
well as power-on. And, the power-off sequence must be
conformed to the following order within 100ms.
Driver > DVDD2 > AVDD > DVDD1
Speed Acceleration Control
This function is activated by set 1 to the bit STPSEL.
When the pin START is set H, or bit START_REG is set
1, the step pulses are generated and output to the pin STP,
based on the acceleration curve data written in the
E2PROM.
Smooth Current Control
The motor current is adjusted by the reference voltage at
the pin VREFO driven by 8-bit DAC.
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