ADBMS6821 datasheet(25/28 Pages) AD

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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.

ADBMS6821 bảng dữ liệu(PDF) 25 Page - Analog Devices