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

MA710 Rev. 1.0

www.MonolithicPower.com

16

9/27/2017

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Figure 14: Example Write Output Rotation Direction (RD) to Counterclockwise (High), on Register 9, Bit 7

SSI

SSI is a 2-wire synchronous serial interface for

data reading only. The sensor operates as a

slave to the external SSI master and supports

only angle reading. It is not possible to read or

write registers by SSI.

SSI Communication

Unlike SPI, the sensor SSI only supports angle

reading operation. It is not possible to read or

write

registers

using

SSI.

SSI

timing

communication is shown in Figure 15 and Table

5.

Figure 15: SSI Timing

Table 5: SSI Timing

Parameter

Description

Min

Max

Unit

tssd

15

ns

tssck

SSCK period

0.04

16

µs

tssckL

Low level of SSCK signal

0.02

8

µs

tssckH

High level of SSCK signal

0.02

8

µs

tm

Transfer timeout (monoflop time)

25

µs

tp

Dead time: SSCK high time for next data reading

40

µs

SSI Read Angle

The bit order of the transmitted data is MSB first

and

LSB

last.

Every

1µs,

new

data

is

transferred into the output buffer. The master

device triggers the reading by driving SSCK

high. A full reading requires up to 17 clock

counts (see Figure 16).

The first clock is a dummy clock to start the

transmission. The data length is up to 16 bits

long. See the data output length section in the

General Characteristics table on page 5 for the

number of useful bits delivered at the serial

output.