KMA310 datasheet(8/71 Pages) NXP

8 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3 — 27 February 2019

8 / 71

8.4 CRC nibble

The CRC nibble contains the 4-bit checksum of the DATA nibbles only. The CRC

calculation does not cover the STATUS nibble.

The CRC is calculated using polynomial x4 + x3 + x2 + 1 with seed value of 0101b. The

KMA310 supports both the legacy CRC defined in SENT SAE J2716 FEB2008 and

earlier revisions and the recommended CRC defined in SENT SAE J2716 JAN2010 and

later.

The CRC version can be selected via CRC type bit in the SENT_SETTING1 register;

see Table 51. CRC in accordance with SAE J2710 JAN2010 is the default configuration.

8.5 PAUSE pulse

A PAUSE pulse can be optionally attached to the SENT frame to generate messages

with a constant frame length via register; see Table 51. The frame length depends on the

protocol format:

• A.1 and H.1: 239 clock ticks

• A.3 and H.4: 269 clock ticks

• H.3: 196 clock ticks

Additionally, the frame length with PAUSE pulse can be set to 297 clock ticks for all

protocol formats via register.

8.6 DATA nibbles

In general, the DATA nibbles contain the fast channel angular value of the device. The

DATA nibble content depends on the selected protocol format. KMA310 supports the

following different protocol formats as defined in the SAE J2716 SENT specification:

• Single secure sensor format A.3 (rev 3), H.4 (rev 4)

• Dual throttle position sensor format A.1 (rev 3), H.1 (rev 4)

• High-speed 12-bit message format H.3 (rev 4)

A detailed frame format description can be found in the corresponding subsection.

8.7 Single secure sensor formats A.3 and H.4

KMA310 generates the sequence defined in Table 6 repeatedly in accordance with

the single secure sensor format defined in SAE J2716 JAN2010 SENT appendix A.3,

respectively J2716 APR2016 SENT appendix H.4. DATA nibbles D0 to D2 contain

the 12-bit angular value. D3 and D4 reflect the value of an 8-bit loop counter. D5 is an

inverted copy of the most significant nibble (MSN) DATA0. The difference between

A.3 and H.4 is that A.3 uses the whole 12-bit data range for angular values while H.4

excludes the values 0 and 4089 to 4095 from the angular data range for diagnostic

purposes; see Table 7.

KMA310 Datasheet(PDF) 8 Page - NXP Semiconductors

KMA310 Datasheet(HTML) 8 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71

Datasheet Download

Link URL