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ATECC508A Datasheet(PDF) 94 Page - Microchip Technology |
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ATECC508A Datasheet(HTML) 94 Page - Microchip Technology |
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94 / 109 page  11. Mechanical 11.1 Wiring Configuration for Single-Wire Interface Using the Single-Wire Interface allows the connection of ATECC508A to a host using only a single pin (SDA) to transfer data in both directions. This interface does not use the SCL pin, which should be tied to ground. To prevent forward biasing the internal diode and drawing current across power planes in the system, the resistor pull-up on the SDA pin should either be connected to the same supply that is connected to the VCC pin or to a lower voltage rail. If the signal levels for SDA are different than the VCC voltage, consult the parametric specifications section of this document to ensure that the signal levels are such that excessive leakage current will be minimized when in sleep modes. This situation might occur if the ATECC508A device is physically distant from the bus master device and the supply voltage for the bus master is different than the supply voltage for ATECC508A. Figure 11-1. 3-wire Configuration for Single-Wire Interface ATECC508A Mechanical © 2017 Microchip Technology Inc. Datasheet Complete DS20005927A-page 94 |
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