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ADBMS6821 Datasheet(PDF) 25 Page - Analog Devices |
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ADBMS6821 Datasheet(HTML) 25 Page - Analog Devices |
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25 / 28 page  Data Sheet ADBMS6821/ADBMS6822 THEORY OF OPERATION analog.com Rev. B | 25 of 28 Average LPCM Supply Current=IVPLSTN+ IVDD/VPRDY_LPCM×1ms/Heartbeat Period (1) Thus, for instance, when VP = 12 V, VDD = 0 V, and heartbeat period = 1 sec, the average LPCM supply current is approximately 12 µA. SPI PINS DURING LPCM When the MSTR pin transitions low to begin LPCM operation, the CS, SCK, and PICO pins of the transceiver cease to operate as input pins and begin to operate as low impedance output pins. The POCI pin ceases to operate as a low impedance output pin and begins to operate as an input pin, which can cause contention if the VDDS supply remains powered and the attached microcontrol- ler continues to drive the CS, SCK, and PICO pins. To prevent contention on these pins, disable the VDDS supply or stop the microcontroller from driving these pins before driving the MSTR pin low. |
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