Analog Signal Calibration In The Production Application; Nvram Programming Via 3-Pin Uart Programming Cable - Performance Motion Devices Juno MC74113 User Manual

Juno IC Configuration in the Production Application
6
1x3 3-pin 2 mm header component on the other. A representative PCB mounted header component is Samtec
MTMM-103-04-x-S-150.
Figure 6-1:
NVRAM
Programming
Via 3-pin UART
Programming
Cable
The table below shows the required wiring for the on-board connector if it is to be used with the PMD Corp.
programming cable:
Connector
Pin #
1
2
3
6.1.3
Some PMD Corp. distributors and sales outlets provide an NVRAM programming service for Juno ICs. Contact your
PMD Corp. sales representative for availability, terms, and conditions.
6.2
After integration into a PCB, it is recommended that the external analog signal processing circuitry that inputs to the
Juno IC be calibrated. While some applications will not need these calibrations, for applications where the quietest,
smoothest, and most accurate motion is desired, calibration of the analog inputs is recommended. The signals that can
be calibrated for the Juno step motor ICs are
Signal Calibration."
When a microprocessor is on the user PCB, generally this microprocessor is used to send the serial host commands
needed to calibrate the analog inputs as part of the power up sequence.
Another approach is to have the Juno IC execute the calibration procedure during its NVRAM-based initialization
startup. This is done by embedding an initialization sequence that executes the calibration during the NVRAM startup
at each power cycle. This approach can only be used when the startup condition of the PCB and connected motors is
controllable. For example if the calibration occurs when the motors are still spinning, the calibration will not give
accurate results.
36
PMD
USB Programming Cable
Windows PC
USB Port
Juno Pin #
(64-pin TQFP
Pin Name Package)
SrlXmt 27
SrlRcv 32
GND 28 (or other ground
signal)
Purchasing Pre-Configured Parts
Analog Signal Calibration in the
Production Application
CurrentA-CurrentD
MC74113
MC74113N
MC75113
MC75113N
SrlRcv
SrlXmt
Gnd
3-Pin 2 mm
Header On
Production PCB
Juno Pin #
(56-pin VQFN
Package)
24
28
25
. For more information refer to
Juno Step Motor Control IC User Guide
Section 9.2.3, "Current