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| ezlinx:isolated-i2c [13 May 2012 13:55] – Approved Hein Marais | resources:eval:ezlinx:isolated-i2c [28 May 2012 12:54] – Approved Hein Marais |
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| [[http://wiki.analog.com/ezlinx|ezLINX™ iCoupler® Isolated Interface Development Platform Homepage]] | [[resources/eval/ezlinx|ezLINX™ iCoupler® Isolated Interface Development Environment Homepage]] |
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| ====== ezLINX™ Isolated I2C Implementation====== | ====== ezLINX™ Isolated I2C Implementation====== |
| The Isolated I2C port is implemented using the [[http://www.analog.com/adum1250|ADuM1250]] I2C Isolator and [[http://www.analog.com/adum5000|ADuM5000]] //iso//Power Isolated DC to DC converter. The [[http://www.analog.com/adum1250|ADuM1250]] connects to TW1 of the ADSP-BF548 and is capable of functioning at a maximum frequency of 1MHz. Figure 1 below shows a circuit diagram of the implementation of the [[http://www.analog.com/adum1250|ADuM1250]] and [[http://www.analog.com/adum5000|ADuM5000]] on the //ez//LINX hardware. | The Isolated I2C port is implemented using the [[http://www.analog.com/adum1250|ADuM1250]] I2C Isolator and [[http://www.analog.com/adum5000|ADuM5000]] //iso//Power Isolated DC to DC converter. The [[http://www.analog.com/adum1250|ADuM1250]] connects to TW1 of the ADSP-BF548 and is capable of functioning at a maximum frequency of 1MHz. Figure 1 below shows a circuit diagram of the implementation of the [[http://www.analog.com/adum1250|ADuM1250]] and [[http://www.analog.com/adum5000|ADuM5000]] on the //ez//LINX hardware. |
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| | {{ :ezlinx:isolatedi2c.png?nolink&600 |Figure 1. Isolated I2C schematic}} |
| {{ :ezlinx:i2c.jpg?nolink&600 |Figure 1. Isolated I2C schematic}} | |
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| VDD1 of the [[http://www.analog.com/adum1250|ADuM1250]] and VDD1 of the [[http://www.analog.com/adum5000|ADuM5000]] are both powered by 3.3V. The ADuM5000 will generate an isolated 3.3V which is used to supply power to VDD2 of the [[http://www.analog.com/adum1250|ADuM1250]]. | VDD1 of the [[http://www.analog.com/adum1250|ADuM1250]] and VDD1 of the [[http://www.analog.com/adum5000|ADuM5000]] are both powered by 3.3V. The ADuM5000 will generate an isolated 3.3V which is used to supply power to VDD2 of the [[http://www.analog.com/adum1250|ADuM1250]]. |
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| A three pin screw terminal connector, J22, is used for easy access to the SDA (Pin 1), SCL (Pin 2) and I2C_ISO_GND (Pin 3) connections. | A three pin screw terminal connector, J22, is used for easy access to the SDA (Pin 1), SCL (Pin 2) and I2C_ISO_GND (Pin 3) connections. |
