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KivApple / dell-charger-emulator Public

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Emulator of original Dell charger using ATTINY85

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dell-charger-emulator Reading and writing EEPROM

README.md

 dell-charger-emulator

Emulator of original Dell charger using ATTINY85

Power adapter for Dell laptops contains IC to determine adapter
capabilities (watts, voltage, current). If you connect an unoriginal
adapter, the laptop refuses to charge the battery. This project
allows to use the cheap and small microcontroller ATTINY85 for
emulating the answers of the original adapter to the requests of the
laptop.

You can configure adapter settings in the file eeprom-data.hex. This
file contains EEPROM data in Intel Hex format. Format of Dell charger
identification shown below:

Offset Length         Content               Description
0      4      DELL                    Manufacturer identifier
4      4      00AC                    Adapter type
8      3      045                     Watts (45W)
11     3      195                     Tenths of a volt (19.5V)
14     3      023                     Tenths of amps (2.3A)
17     23     CN0CDF577243865Q27F2A05 Serial number
40     2      0x3D 0x94               CRC-16/ARC (LSB first)

The description may not be entirely accurate. I'll be glad if you
clarify.

You can use Python utility dell-charger-data-editor.py to easily
change this values.

You must flash the EEPROM data together with the program code. Later
you can only re-write EEPROM.

Warning: do not mask the weak power adapter to a more powerful one.
This can lead to hardware damage.

Schematic

You need ATTINY25, ATTINY45 or ATTINY85 MCU (you may need to change
compiler flags in Makefile) running at 8 MHz (the internal
RC-oscillator is suitable, but if desired, you can use an external
crystal - adjust the fuses accordingly). The Dell power adapter
connector has three pins - GND, VOUT (19V) and ID. Connect the ID to
the PB2 pin of the microcontroller. Also provide 3.3V power for MCU
(you can use a simple linear regulator 78L33 to make the desired
voltage from 19V).

 Reading and writing EEPROM

You can read and write EEPROM using dell-charger-data-editor.py (see
console menu of this utility).

You need connect OneWire bus to any USB-UART adapter using simple
schematic with diode:

TXD --------|<|----*-------- ID
                   |
RXD ----------------

GND ------------------------ GND

Warning: USB-UART adapter should use 3.3V or 5V logic levels. 12V
levels will damage EEPROM IC.

You can read by this utility both original EEPROM and emulated by
AVR. You can write only emulated EEPROM.

About

Emulator of original Dell charger using ATTINY85

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  * Python 45.8%
  * Makefile 3.9%

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