MA710 – 12-BIT, DIGITAL ANGLE SENSOR WITH ABZ & PWM OUTPUTS

MA710 Rev. 1.0

www.MonolithicPower.com

14

9/27/2017

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SPI Read Register

A read register operation is constituted of two

16-bit frames. The first frame sends a read

request,

which

contains

the

3-bit

read

command (010) followed by the 5-bit register

address. The last eight bits of the frame must

be all set to 0. The second frame returns the 8-

bit register value (MSB byte).

The first 16-bit SPI frame (read request) is:

MSB

LSB

MISO

Angle(15:0)

command

reg. address

MOSI

0

1

0

A4 A3 A2 A1 A0

0 0 0 0 0 0 0 0

The second 16-bit SPI frame (response) is:

reg. value

MISO V7 V6 V5 V4 V3 V2 V1 V0

0 0 0 0 0 0 0 0

MSB

LSB

MOSI

0

See Figure 11 for a complete transmission

overview.

For example, to get the value of the magnetic

level high and low flags (MGH and MGL), read

register 27 (bit 6, bit 7) by sending the following

first frame:

MSB

LSB

MISO

Angle(15:0)

command

reg. address

MOSI

0

1

0

1

1

0

1

1

0 0 0 0 0 0 0 0

In the second frame, the MagAlpha replies:

reg. value

MISO MGH MGL X X X X X X

0 0 0 0 0 0 0 0

MSB

LSB

MOSI

0

See Figure 12 for a complete example overview.

Figure 11: Two 16-Bit Frames Read Register Operation

Figure 12: Example Read Magnetic Level Flags High and Low (MGH, MGH) on Register 27, Bit 7-6