Revision 1.3

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AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

Datasheet

4.3.4

I²C Slave address

Figure 1 3 Sla ve address construction

The slave address consists of the hardware setting on pins A1, A2 and upper MSBs programmable by the user. The MSB of

the slave address (yellow) is internally inverted. This means that by default the resulting data is ‘1’. A read of the I²C slave

address register 21 will return a ‘0’ at the MSB.

4.4

PWM interface

The AS5048 provides a pulse width modulated output (PWM), whose duty cycle is proportional to the measured angle. The

PWM frequency is internally trimmed to an accuracy of

±10% over full temperature range. This tolerance can be cancelled

by measuring the complete duty cycle.

The PWM signal consists of different sections:

•

Init:

12 clocks

-> PWM = ‘high’

•

Error_n:

4 clocks

-> PWM = ‘not(system_error)’

•

Data:

4095 clocks -> PWM = ‘angle_zero’ / ‘low’ (in case of error)

•

Exit:

8 clocks

-> PWM = ‘low’

In case of an error the data section is set to zero.

1

0

0

0

0

A

2

A

1

OTP cotent

(Default)

Slave Address

X

X

X

X

X

X

X

X

Register Address

random read

1

0

0

0

0

A

2

A

1

Slave Address

X

X

X

X

X

X

X

X

Data Byte (n)

X

X

X

X

X

X

X

X

Register Address

X

X

X

X

X

X

X

X

Data Byte (n)

HW

Pins

HW

Pins

1

0

0

0

0

A

2

A

1

OTP cotent

(Default)

Slave Address

random write

HW

Pins