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Installation and Operation

2.3.1.6 VIEW THE STATE OF MCP1631HV DIGITALLY CONTROLLED

PROGRAMMABLE CURRENT SOURCE REFERENCE DESIGN

The MCP1631HV Digitally Controlled Programmable Current Source Reference

Design is able to show, using an oscilloscope, the system state. To use this feature,

connect the scope probe to test point TP1. Testpoint TP1 is output pin U2-8 of the

PIC16F616 microcontroller. There are nine status waveforms listed below. A pulse

stream of one to nine 10 µs pulses are generated at TP1 test point every one second

interval. The pulse stream indicates the current state of the system software. Note that

the first two states may complete immediately and thus may be difficult to capture on a

non-storage scope.

• 1 pulse - output power is switched ON

• 2 pulses - qualification charging

• 3 pulses - charging - NiMH / NiCd constant current mode

• 4 pulses - charging - NiMH / NiCd top off current mode

• 5 pulses - charging - Li-Ion constant current mode

• 6 pulses - charging - Li-Ion constant voltage mode

• 7 pulses - dimming - LED constant current mode

• 8 pulses - fault - overvoltage protection state

• 9 pulses - output power switched OFF (Standby)

2.3.1.7 PROGRAMMING THE PIC16F616 MICROCONTROLLER

To evaluate the board, the firmware package provides 3 hex files for the LED driver,

Li-Ion Battery Charger, and NiMH/NiCd Battery Charger. The board is factory

programmed with the LED driver firmware for 700 mA maximum current and 10:1

dimming (~70 mA/step). All parameters may be changed in firmware to the desired

value according to the output capability. The source code is commented extensively

and helps the user to define the board.

The header file,

00234R1.h, contains the pre-processor definitions which define the

system. The user may modify the definitions to change specific system parameters to

meet design goals.

mikroElektronika’s mikroC compiler was used to compile the source code and create

the hex files for downloading to the reference board. The mikroC compiler is available

at http://www.mikroe.com. The compiler is not included with the reference board kit.

Header J3 is provided for in-system circuit programming. A PICkit

2 programmer may

be connected to J3 to program the reference board.

1. Connect the PICkit

2 programmer to J3.

2. Start the PICkit

2 software.

3. Set Device to PIC16F616.

4. Erase the device.

5. Select “File” then “Import Hex” from the menu. Browse to the desired

*.hex

firmware file to download.

6. Write the file.

7. The status window should indicate success or failure of the download.