DM164130-2 Microchip Technology, DM164130-2 Datasheet - Page 16

• Manufacturer Part Number: DM164130-2
• Description: DEV F1 ACCY BLDC MOTOR ADD-ON
• Manufacturer: Microchip Technology
• Series: PICkit™r

Specifications of DM164130-2

• Accessory Type: Interface Board, Motor
• Processor To Be Evaluated: PIC16LF1937
• Operating Supply Voltage: 1.8 V to 3.6 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: DM164130-1
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

F1 Evaluation Platform User’s Guide
DS41401B-page 16
2.7.4
The time, temperature, pot position and motor speed are displayed on the LCD. The
LCD is a 3.5-digit multimeter display with icons for amps, volts, ohms, etc. The display
uses 4 commons and 10 segment drives. The Timer1 oscillator is used to clock the
display peripheral and allow the LCD to display data even in Sleep. The LCD peripheral
was configured for a Type B waveform for this demo. This mode provides an interrupt
when the LCD can be updated. This interrupt is not required for Type A waveforms, but
the extra complexity of the interrupt allows the LCD peripheral to be used to provide the
real-time clock periodic interrupt. The different waveform types are described in section
21.9 of the PIC16LF193X data sheet (DS41364). Normally, the Timer1 counter would
be used, but this timer is required for the BLDC software. Because the LCD is clocked
from the 32.768 kHz crystal, the LCDIF operates at a multiple of the crystal frequency,
providing a very accurate time base for the real-time clock.
2.7.5
Due to the extreme simplicity of this board, only a single button and a single pot are
available for user input. These two elements allow the user to cycle through the display
elements, change the motor speed and change the time.
Pressing and releasing the button cycles through the 4 display modes:
1. Time
2. Temperature
3. Pot ADC value
4. RPM
Turning the pot will change the motor speed or set the time.
If the display is showing the time, and the button is held down for 3 seconds, turning
the pot clockwise will increase the time, and counter clockwise will decrease the time.
Placing the pot in the center of the range will leave the time unchanged. A feature that
could be added as a simple programming exercise would be to allow the time change
to be faster or slower depending upon pot position.
LCD Display
User Interface
 2010 Microchip Technology Inc.