HCTL-1101 Datasheet, PDF (2/40 Pages) AVAGO TECHNOLOGIES LIMITED – General Purpose Control ICs Position and Velocity Control Low Power CMOS

System Block Diagram
HOST
PROCESSOR
HCTL-
1101
AMP
M
E
Description
Max. Supply Current
Max. Power Dissipation
Max. Tri-State Output
Leakage Current
Operating Frequency
Operating Temperature
Range
Storage Temperature Range
Synchronize 2 or More ICs
Preset Actual Position Reg-
isters
Read Flag Register
LIMIT and STOP Pins
Hard Reset
PLCC Package Available
HCTL-1101
30 mA
165 mW
5 µA
100 kHz-2 MHz
-20°C to +85°C
-55°C to +125°C
Yes
Yes
Yes
Must be pulled up to VDD if
not used.
Required
Yes
Theory of Operations
The HCTL-1101 is a general purpose motor controller
which provides position and velocity control for DC, DC
brushless and stepper motors. The internal block dia-
gram of the HCTL-1101 is shown in Figure 1. The HCTL-
1101 receives its input commands from a host processor
and position feedback from an incremental encoder with
quadrature output. An 8-bit bi-directional multiplexed ad-
dress/data bus interfaces the HCTL-1101 to the host pro-
cessor. The encoder feedback is decoded into quadrature
counts and a 24-bit counter keeps track of position. The
HCTL-1101 executes any one of four control algorithms
selected by the user.
The four control modes are:
• Position Control
• Proportional Velocity Control
• Trapezoidal Profile Control for point to point moves
• Integral Velocity Control with continuous velocity
profiling using linear acceleration.
The resident Position Profile Generator calculates the nec-
essary profiles for Trapezoidal Profile Control and Integral
Velocity Control. The HCTL-1101 compares the desired
position (or velocity) to the actual position (or veloc-
ity) to compute compensated motor commands using a
programmable digital filter D(z). The motor command is
externally available at the Motor Command port as an 8-
bit byte and at the PWM port as a Pulse Width Modulated
(PWM) signal.
The HCTL-1101 has the capability of providing electronic
commutation for DC brushless and stepper motors. Using
the encoder position information, the motor phases are
enabled in the correct sequence. The commutator is fully
programmable to encompass most motor/encoder com-
binations. In addition, phase overlap and phase advance
can be programmed to improve torque ripple and high
speed performance. The HCTL-1101 contains a number
of flags including two externally available flags, Profile
and Initialization, which allow the user to see or check the
status of the controller. It also has two emergency inputs,
LIMIT and STOP, which allow operation of the HCTL-1101
to be interrupted under emergency conditions.
The HCTL-1101 controller is a digitally sampled data sys-
tem. While information from the host processor is accept-
ed asynchronously with respect to the control functions,
the motor command is computed on a discrete sample
time basis. The sample timer is programmable.
2