KMA321 datasheet(6/71 Pages) NXP

6 / 71 page

NXP Semiconductors

KMA321

Programmable angle sensor IC

KMA321

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Product data sheet

Rev. 3 — 28 January 2019

6 / 71

Table 4 describes the digital output behavior for a positive slope. A magnetic field angle

above the programmed maximum angle αmax but below the clamp switch angle αsw(CL)

sets the output to the upper clamping value. If the magnetic field angle is larger than

the clamp switch angle, the output value switches from upper to lower clamping value.

If there is a negative slope, the clamping levels are changed.

Table 4. Digital output behavior for a positive slope

Magnetic field angle

Data value

αmax < α < αsw(CL)

CLAMP_HIGH

αsw(CL) < α < αref + 180°

CLAMP_LOW

aaa-028823

αrng

0 αref

αmax

αsw(CL)

αref + 180°

α (deg)

180

4095

(LSB)

CLAMP_HIGH

CLAMP_LOW

αmax = αref + αrng

Figure 4. Characteristic of the digital output

8.1 Transmission of sensor messages

KMA321 encodes a 12-bit angular value into a sequence of pulses based on the

encoding scheme of the SAE J2716 SENT standard. Data is split into 4-bit nibbles that

are encoded in the time-domain as the duration between two falling edges. The message

frame is a sequence of 4-bit nibbles (SENT frame). The timebase of the SENT frame

is defined in clock ticks with a configurable duration of Tclk = 2.7 µs, 3 µs, 4.5 µs, and

6 µs each clock tick. A calibration pulse (SYNC nibble) followed by a STATUS nibble,

a constant number of fast channel DATA nibbles, a CRC nibble, and an optional PAUSE

pulse define one message frame of a SENT transmission as shown in Figure 5. The

KMA321 is compatible with revisions of the SENT specification listed below and supports

data formats in accordance with appendix A.1, H.1, A.3, H.4, and H.3.

General SENT specification can be found in:

• SAE J2716 FEB2008 SENT rev 2

• SAE J2716 JAN2010 SENT rev 3

• SAE J2716 APR2016 SENT rev 4

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