ENS210 datasheet(13/43 Pages) AMSCO

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[v1-02] 2018-Feb-19

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ENS210 − Functional Description

The I²C Interface

The ENS210 is an I²C slave device. The I²C interface supports

standard (100kbit/s) and fast (400kbit/s) mode.

Details on I²C protocol is according to I²C-bus specifications

[UM10204, I²C-bus specification and user manual, Rev. 6, 4 April

2014].

The device applies all mandatory I²C protocol features for

slaves: START, STOP, Acknowledge, 7-bit slave address. ENS210

does not use clock stretching.

None of the other optional features (10-bit slave address,

General Call, Software reset, or Device ID) are supported, nor

are the master features (Synchronization, Arbitration, START

byte).

I²C Operations on Registers

The ENS210 uses a register model to interact with it. This means

that an I²C master can write a value to one of the registers of a

slave, or that it can read from one of the registers of the slave.

In the ENS210, registers are addressed using 1 byte. The values

stored in a register are also 1 byte. However, the ENS210

implements “auto increment” which means that it is possible to

read, for example, two bytes by supplying the address of the

first byte and then reading two bytes.

Figure 16:

I²C Transaction Formats

A typical write transaction (see Figure 16 a) therefore has the

following format. The master initiates a transaction with a

so-called start condition “s”. This blocks the bus. Next, the

master sends the 7 bits ENS210 slave address followed by a 1 bit

direction (a 0 indicating write “w”). This byte is acknowledged

“a” by the slave. The master continues by sending the 8 bit

master

slave

start/stop

read/write

ack/nack

s slave

address w a

s slave

address w a

s slave

address r

reg val

n p

(a)

(b)

reg addr

reg val

a p

reg addr

reg val

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