67 lines
1.8 KiB
Markdown
67 lines
1.8 KiB
Markdown
Document version: 2015-12-29
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HOWTO connect the Microchip enc28j60 module
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===========================================
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It's possible to to add Ethernet to most microcontrollers having a SPI inter-
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face. In the Atmel world the SPI pins are used for the ISP programming. Usually
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a 6-pin header. Named MOSI, MISO, SCK, CS (Chup Select), Vcc, GND
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One popular Ethernet chip is Microchip ENC28J60. It been used for quite some
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time and is easy to program and are also supported by many platforms and
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projects. Contiki has files under:
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Most focus fon AVR platforms. The SPI is used by Atmel ISP-progammings
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interface. In addition to those pins you to selects a pin for chip
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select (CS).
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dev/enc28j60/
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The low-level SPI drives is platform or rather CPU-specific. The avr-rss2
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platform adds the low-level drivers for Atmel.
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platform/avr-rss2/enc28j60_avr.[ch]
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This should be usable on most 8-bit avr platforms.
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The power consumption might be a problem. The enc28j60 consumes 160mA at 3.3V
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when transmitting. The LDO (voltage reg. LP2950) on the mote can only handle
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100mA. So external power is needed. Below is a description of a prototype.
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Used components:
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----------------
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Externel power supply 5V.
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Small breadboard
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DC-jack
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Voltage Reg. LCP1700 3.3V
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Capacitor 4.7uF
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enc28j60 (From Ebay)
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Pin-headers
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Cables 2x5 (enc28j60) 2x3 SPI (AtMega node)
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Used colors:
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Black GND
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Red VCC 3.3V
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Yellow SCK
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Green MISO
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White MOSI
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Blue CS (Chip select)
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SPI (Connector view)
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--------------------
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GREEN YELLOW NC
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RED WHITE BLACK
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CS is connected to external temp sensor middle pin. Consequently the
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external temp sensor can not be used in this application.
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Pictures
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--------
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![Module] ( http://www.radio-sensors.com/pictures/enc28j60.jpg)
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![Connector] (http://www.radio-sensors.com/pictures/enc28c60-cable.jpg)
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References
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