MCZ33977EGR2 Freescale Semiconductor, MCZ33977EGR2 Datasheet - Page 12

• Manufacturer Part Number: MCZ33977EGR2
• Description: IC DRIVER SGL GAUGE SPI 24-SOIC
• Manufacturer: Freescale Semiconductor
• Type: Single Gauge Driverr

Specifications of MCZ33977EGR2

• Applications: Stepper Motor Driver, 2 Phase
• Number Of Outputs: 1
• Current - Output: 100mA
• Voltage - Supply: 6.5 V ~ 26 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Operating Supply Voltage: 4.5 V to 5.5 V
• Supply Current: 1.8 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Load: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

STATE MACHINE OPERATION
requiring distributed and flexible stepper motor gauge driving.
The device also eases the transition to stepper motors from
air core motors by emulating the air core pointer movement
with little additional processor bandwidth utilization. The two-
phase stepper motor has maximum allowable velocities and
acceleration and deceleration. The purpose of the stepper
motor state machine is to drive the motor with the maximum
performance while remaining within the motor’s voltage,
velocity, and acceleration constraints.
deceleration phase begins at the correct time and pointer
position. When commanded, the motor [will deleted PV]
accelerates constantly to the maximum velocity, and then it
moves toward the commanded position at the maximum
velocity. Eventually, the pointer reaches the calculated
location where the movement has to decelerate, safely
slowing to a stop at the desired position. During the
deceleration phase, the motor does [will deleted PV] not
exceed the maximum deceleration.
microstepped at 24 steps per electrical revolution, illustrated
in
degrees of pointer movement. There is a second smaller
[parentheses removed-unnecessary] state machine in the IC
controlling these microsteps. The smaller state machine
receives clockwise or counter-clockwise index commands at
timed intervals, thereby stepping the motor in the appropriate
direction by adjusting the current in each coil. Normalized
values are provided in
12
33977
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Figure
The 33977 is ideal for use in instrumentation systems
A requirement of the state machine is to ensure the
During normal operation, both stepper motor rotors are
7. A complete electrical revolution results in two
Table
5.
FUNCTIONAL DEVICE OPERATION
OPERATIONAL MODES
Table 5. Coil Step Value
Step Angle
10
0
1
2
3
4
5
6
7
8
9
105
120
135
150
0.0
15
30
45
60
75
90
Figure 7. Clockwise Microsteps
(Angle)*
0.259
0.707
0.866
0.966
0.966
0.866
0.707
SINE
0.0
0.5
1.0
0.5
Analog Integrated Circuit Device Data
COS (Angle -30)*
PE6=0
-0.259
-0.707
-0.866
0.965
0.866
0.707
0.259
-0.5
1.0
0.5
0.0
Freescale Semiconductor
COS (Angle -30)*
PE6=1
-0.259
-0.500
0.866
0.966
0.966
0.866
0.707
0.500
0.259
1.0
0.0