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Communication Interface

I²C Communication

Application Note

• PUBLIC

AN000710

• v1-00 • 2020-Jul-21

12

│ 4

2

I²C Communication

2.1

Activate Communication Interface

After powering up, the sensor is automatically in functional mode and the pin 11(SIN+/SDA) and

pin 9 (COS+/SCL) are driven as analog output.

For changing into I²C Communication mode, the rma procedure has to be executed.

CAUTION

rma procedure can only be done, when the OTP section is not burned

Figure 2:

rma Procedure

The rma procedure consists of particular time frames, which starts when the sensor notices an

overvoltage (OV Detection). Therefore, the supply voltage increases until the threshold voltage

after “OV Detection time”.

After 1

ms “waiting time” there is a “time window”, where the programmer can send the rma-pulses.

After this procedure and at normal voltage supply, the sensor reaches communication mode.

At overvoltage, the sensor is in “safe state” (for safety reasons the output goes into high-Z). First, the

supply voltage must decrease under the threshold voltage and its typical value, then the outputs/ I²C

are reactivate.

For detailed information

on “Overvoltage detection” see datasheet (AS5715R_DS000511_2-00),

chapter “Power Supply”.

rma procedure

time window (1ms)

SIN+/SDA

COS+/SCL

OV condition triggered

OV Detection time

Functional mode

communication mode

wait time (1ms)

communication mode

Functional mode