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3.2 Digital Interface The digital I/O blocks of the UMSI chip include a multi-node sensor bus interface to a microcontroller that is fully hardware compatible with the IEEE P1451.2 standard, a Serial Peripheral Interface (SPI) with a 4b chip select for communication with optional external components, a bi-directional 8b digital I/O port, SPI Bus Sensor Bus IM Sensor Bus Interface Temperature Sensor SPI Interface Serial D/A 2 I/O Port Serial A/D Mode Set EEPROM (TEDS) UMSI Chip Sensor Readout voltage-output readout provides control over the signal range/sensitivity by attenuating the input voltage and feeding it to the programmable gain amplifier stage.
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