MA780 – 8-BIT TO 12-BIT LOW-POWER ANGLE SENSOR

MA780 Rev. 1.2

MonolithicPower.com

10

8/30/2021

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 Insert an RC low-pass filter on SCLK (see

Figure 11). This RC filter must be located

close to the sensor. It is recommended to use

a 200

Ω serial resistor with a 10pF shunt

capacitor in order to have a filter cutting

frequency that is about 80MHz.

 Use a star topology for the GND connection,

and keep it as direct and short as possible to

avoid ground loops.

 Insert RC low-pass filters on the MISO and

MOSI signals. The RC filter on MOSI must

be located close to the controller, while the

filter on MISO must be located close to the

sensor. It is recommended to use a 200

Ω

resistor with a 10pF capacitor.

 Avoid significant trace length mismatch

between the SPI signals, especially between

the MISO, MOSI, and SCLK signals.

 If possible, avoid placing vias on the SCLK

signal.

Figure 11: Example of an RC Low-Pass Filter on the SPI Signals

/CS

MA780

SCLK

MISO

Host/Master

Processor

10pF

200

10pF

10pF

MOSI

SPI

Interface

Master

200

200