AS5046 Programmable 360° Magnetic Angle Encoder – Preliminary Data Sheet

Revision 1.1

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9.4

Analog-Digital Converter Outputs, SIN/COS Signal Bus (Type ID: 0100)

Type ID:

0100

Byte 1

Byte 2

Byte 3

Addr. 000

12-bit ADC output: COS signal bus

Upper 8 bits

12-bit ADC output: SIN signal bus

Upper 8 bits

COS signal bus

Lower 4 bits

SIN signal bus

Lower 4 bits

11

10

9

8

7

6

5

4

11

10

9

8

7

6

5

4

3

2

1

0

3

2

1

0

The analog signals on the SIN- and COS- buses are converted into a signed 12-bit digital value by two ADC’s, one for each

bus.

To read the signal from one or more Hall Sensors, first assign a signal bus (SIN, COS) for each Hall Sensor in the Hall

Sensor front-end and then read the corresponding amplitude value from the ADC output register.

Note that the ADC’s are 14-bit (see Block diagram, Figure 2), but only 12-bit are available to the user. The available

12-bit ADC output is again split into an upper 8-bit block (available in bytes 1 & 2) and a lower 4-bit block in byte 3.

The resulting 12-bit value is formatted as a signed 12-bit value and has a range from -2048…+2047 (decimal). Bit 11

(MSB) is the sign bit; if this bit is set, the Sin/Cos value is negative.

9.5

Automatic Gain Control Register (Type ID: 0111)

The Automatic Gain Control is active in the “green” range of the magnetic field, when the magnetic field is within

~35…63mT. If the magnetic field is too low, e.g. when the magnet is too far away from the chip, the AGC register will be

Automatic Gain control can be disabled by writing a value into this register. It will be enabled by reading from this register.

Type ID: 0111

Byte 1

Addr. 000

AGC7

AGC6

AGC5

AGC5

AGC3

AGC2

AGC1

AGC0