MPL115A2 datasheet(7/16 Pages) FREESCALE

7 / 16 page

Sensors

Freescale Semiconductor, Inc.

MPL115A2

The polynomial can be evaluated (Equation 1) as a sequence of 3 MACs:

Please refer to Freescale application note AN3785 for more detailed notes on implementation.

3.4

I2C Device Read/Write Operations

All device read/write operations are memory mapped. Device actions e.g. “Start Conversions” are controlled by writing to the

appropriate memory address location.

•For I2C the 7-bit Device Address (from Table 2) has a read/write toggle bit, where the least significant bit is ‘1’ for read

operations or ‘0’ for write operations. The Device Address is 0xC0 for a Write and the Device Address is 0xC1 for a Read.

•

The most significant bit in the Command tables below is not used and is don't care (X). In examples given it’s set to ‘0’.

Refer to Sensor I2C Setup and FAQ Application Note AN4481 for more information on I2C communication between the sensor

and host controller.

X = Don’t care

1 = The command byte needs to be paired with a 0x00 as part of the I2C exchange to complete the passing of Start Conversions.

Table 3. I2C Write Commands

Command

Binary

HEX(1)

Devices Address + Write bit

1100 0000

0xC0

Start Conversions

X001 0010

0x12

Pcomp

c12 Tadc

⋅

() Padc b2 Tadc

⋅

c12

Tadc

Padc

PComp

MPL115A2 데이터시트(PDF) 7 Page - Freescale Semiconductor, Inc