BPS120 datasheet(2/6 Pages) BOURNS

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3312 - 2 mm SMD Trimming Potentiometer

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BPS120 Series - 12 mm Digital Low Pressure Sensor

I2C Parameters

SCL Clock Frequency fSCL...............................................................................................................................................................100 to 400 kHz

Start Condition Hold Time Relative to SCL Edge tHDSTA...............................................................................................................................0.1 µs

Minimum SCL Clock Low Width1 tLOW ..........................................................................................................................................................0.6 µs

Minimum SCL Clock High Width1 tHIGH.........................................................................................................................................................0.6 µs

Start Condition Setup Time Relative to SCL Edge tSUSTA.............................................................................................................................0.1 µs

Data Hold Time on SDA Relative to SCL Edge tHDDAT..................................................................................................................................0.0 µs

Data Setup Time on SDA Relative to SCL Edge tSUDAT................................................................................................................................0.1 µs

Stop Condition Setup Time on SCL tSUSTO...................................................................................................................................................0.1 µs

Bus Free Time Between Stop Condition and Start Condition tBUS ...................................................................................................................2 µs

1 Combined low and high widths must equal or exceed minimum SCLK period.

I2C Parameters

I2C Communication

Communication to the Model BPS120 is read only. To read the pressure counts, the master performs a read request by asserting a start

condition, sending the 7-bit address of the part (if the part has an open address, 7 bits of anything is acceptable), and sets the read/write bit.

The master then waits for an acknowledgement. The acknowledgement is sent by the pressure sensor along with 2 bits of status and bits 13:8

of the pressure counts, the master acknowledges the first 8 bits, and the pressure sensor sends the remaining 8 bits of data. The master then

does not acknowledge and sends a stop condition, signaling the end of the transaction.

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