1-Wire Interface on the i.MX21 Applications Processor
●The 1-Wire® Interface on the i.MX21 Applications Processor is an on-chip peripheral device that establishes bi-directional communication with one or more external 1-Wire devices. This application note illustrates the steps required to establish communication between the on-chip 1-Wire Interface and an external MAXIM/Dallas Semiconductor Multichemistry Battery Fuel Gauge device, DS2751.
●The i.MX21 General Purpose I/O (GPIO) port E can be configured for use as a 1-Wire port. A 1-Wire system consists of an I/O data pin that can be driven to logic high, driven to logic low, or can act as an input. There is also an associated ground pin. The system requires one bus master, and can support multiple slave devices. There is only one slave device (the DS2751) for the scenario considered in this application note, with the i.MX21 acting as the bus master.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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10/2005 |
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Rev. 1 |
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AN2681 |
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339 KB |
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