Instructions

Table Of Contents

4 Digital interface

The sensor supports standard I

C (Inter-IC) bus protocol. I

C is a serial 8-bit protocol with

two-wire interface that supports communication between different ICs, for example, between

microcontrollers and other peripheral devices. Further information about the I

C interface

can be found at https://www.nxp.com/docs/en/user-guide/UM10204.pdf .

4.1 General characteristics

A serial data line (SDA) and a serial clock line (SCL) are required for the communication

between the devices connected via I

C bus. Both SDA and SCL lines are bidirectional. The

output stages of devices connected to the bus must have an open-drain or open-collector.

Hence, the SDA and SCL lines are connected to a positive supply voltage via pull-up resis-

tors. In I

C protocol, the communication is realized through master-slave principle. A master

device generates the clock pulse, a start command and a stop command for the data trans-

fer. Each connected device on the bus is addressable via a unique address. Master and

slave can act as a transmitter (master-transmitter or slave transmitter) or a receiver (master

receiver or slave receiver) depending upon whether the data needs to be sent or received.

This sensor behaves like a slave device on the I

C bus

Microcontroller

(Master)

Sensor

(Slave-1)

Sensor

(Slave-2)

+VDD

SCL

(serial clock)

SDA

(serial data)

Pull up resistors

Figure 3: Master-slave concept

Differential Pressure Sensor, Part Nr. 25131308xxx01