Board Mount Pressure Sensor

AMS 6915 SERIES

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www.analog-micro.com

Datasheet AMS 6915

– Rev. 2.0

7/13

I2C-INTERFACE

AMS 6915 pressure sensors have a digital output (I²C-interface). When connected to a bidirectional I²C-bus,

the current corrected digital pressure and temperature values can be read from AMS 6915

’s output register

via the I²C-interface.

Communication via the I²C-bus follows a simple master-slave principle. Data transfer is always initialized by

a master (such as a microcontroller), which sends a data request to the sensor; the AMS 6915 sensor

–

which always operates as slave

– answers then.

The I²C-bus requires just two bus lines: a serial data line (SDA) and a serial clock line (SDL). SDA and SCL

are bidirectional lines, which are connected to the positive supply voltage using pull-up resistors.

AMS 6915 communication protocol adheres to a standard I²C communication protocol (given in Figure 3)

1.

1 There are three differences of AMS 6915’s communication protocol compared to the original I²C communication

protocol:

1.

A stop condition directly after a start condition without clock pulses in between is not allowed. This creates a

communication error for the next communication.

2.

A second start condition (restart) during data transmission when SCL is still high is not allowed.

3.

Between the start condition and the first rising SCL edge a falling SDA edge is not allowed.

Figure 3: Standard I²C protocol