MAQ473

– 9-BIT TO 14-BIT, AUTOMOTIVE ANGLE SENSOR W/ ABZ & PWM OUTPUTS

MAQ473 Rev. 1.0

MonolithicPower.com

13

5/12/2021

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SPI Read Register

A read register operation consists 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

8 bits of the frame must all be set to 0. The

second frame returns the 8-bit register value

(MSB byte).

First 16-bit SPI frame (read request):

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

Second 16-bit SPI frame (response):

Register Value

MISO V7 V6 V5 V4 V3 V2 V1 V0

0 0 0 0 0 0 0 0

MSB

LSB

MOSI

0

Figure 11 shows 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:

Register Value

MISO MGH MGL X X X X X X

0 0 0 0 0 0 0 0

MSB

LSB

MOSI

0

Figure 12 shows 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, Bits[6:7]

SPI Write Register

The Register Map section on page 18 shows

the programmable 8-bit registers. Data written

to these registers is stored in the on-chip non-

volatile

memory

(NVM)

and

reloaded

automatically at start-up.