KMA310 datasheet(44/71 Pages) NXP

44 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

44 / 71

16.3.3 Entering the command mode

After a power-on reset, the sensor provides a time slot tcmd(ent) for entering the command

mode. Send a specific command sequence (see Figure 26). If command mode is not

entered, the sensor starts in the normal operation mode. If the sensor stays in the

diagnostic mode, the master can write the signature without a power-on reset.

During the command mode sequence, the output is enabled. The external programming

hardware has to overdrive the output with current Iod. If command mode is activated, the

output is disabled and pin OUT/DATA operates as a digital interface.

VDD

OWI

signature

aaa-028148

command

B4h

START

STOP

64h

83h

tcmd(ent)

Figure 26. OWI command mode procedure

16.4 Cyclic redundancy check

As mentioned in Section 10.1, there is an individual 8-bit checksum for each non-volatile

memory area. Bit 8 of the CTRL1 register indicates a checksum error of customer area

1, 2 or 3 as well as the manufacturer area of the NVM including the traceability registers.

Generate the CRC with the MSB of the data word first over all corresponding addresses

in increasing order for the corresponding memory area, to calculate the checksums.

Read out all registers of the non-volatile memory area for calculating the checksum.

The LSB contains the previous checksum and must be overwritten with 0h before the

calculation can be started.

The generator polynomial for the calculation of the checksum is:

(9)

With a seed value of AAh and the data bits are XOR at the x8 point.

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