KMA310 datasheet(12/71 Pages) NXP

12 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

12 / 71

A.1

H.1

D5[1]

D3[2]

12-bit value

Angle

12-bit value Angle/mode

1111

4095

reserved

4095

initialization message

[1]

MSN.

[2]

LSN.

[3]

For detailed diagnostic information, the serial data communication can be enabled.

For the dual throttle position sensor formats A.1 and H.1, the clamping levels must

be set to the correct values to comply with the SAE J2716 SENT specification.

A.1: CLAMP_HIGH = 4094, CLAMP_LOW = 1. H.1: CLAMP_HIGH = 4088,

CLAMP_LOW = 1. Otherwise angular values overwrite the reserved data range for

diagnostic information.

8.9 High-speed 12-bit message format H.3

The KMA310 generates the sequence defined in Table 12 repeatedly in accordance with

the high-speed 12-bit message format H.3 defined in SAE J2716 APR2016. This mode

realizes almost a doubling of the update rate compared to other modes. The increase

of the update rate is achieved by transmitting 12-bit angular data with only four DATA

nibbles using only 3 bit of the available 4 bit per nibble. The MSB of each nibble is always

zero. Additionally, the clock tick length shall be set to 2.7 µs typically with a maximum

variation of ±10 %. The SYNC, STATUS, and CRC nibble and the serial communication

are the same as for the other protocol formats.

aaa-008204

12-bit message

fast channel

56 ticks

4-bit

3-bit

4-bit

overall message - 131 clock ticks to 187 clock ticks (depending on data values)

Figure 8. High-speed 12-bit message format frame H.3

Table 12. High-speed 12-bit message format: frame

SYNC

STATUS

DATA0

DATA1

DATA2

DATA3

CRC

D0[1]

D3[2]

diagnostic and

pre-warning

12-bit angular value

[1]

MSN.

[2]

LSN.

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