KMA320 datasheet(40/71 Pages) NXP

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NXP Semiconductors

KMA320/A

Dual channel programmable angle sensor IC

16 Programming

16.1 General description

The device provides an OWI to enable programming of the device which uses

pin OUTn/DATAn bidirectionally.

In general the device runs in analog or SENT mode, the normal operation mode. The

embedded programming data configures this mode. After a power-on reset once time

ton has elapsed, it starts. In this mode, the magnetic field angle is converted into the

corresponding output voltage per channel.

A second mode, the command mode enables programming. In this mode, the customer

can adjust all required parameters (for example zero angle and angular range) to meet

the application requirements. Data is stored in the non-volatile memory. After changing

the contents of the memory, recalculate and write the checksum (see Section 16.4).

In order to enter the command mode keep pin OUTn/DATAn HIGH for at least tto and

send a specific command sequence after a power-on reset and during the time slot

tcmd(ent). The external source used to send the command sequence must overdrive the

output buffer of the device. In doing so, it provides current Iod. This signature can be sent

to each channel separately or in parallel.

During communication, the channels of the KMA320/A are always the slaves and the

external programming hardware is always the master. Figure 21 illustrates the structure

of the OWI data format.

001aag742

write

IDLE

START

STOP

COMMAND DATA BYTE 1 DATA BYTE 2

IDLE START COMMAND HANDOVER

TAKEOVER STOP IDLE

DATA BYTE 1 DATA BYTE 2

read

Figure 21. OWI data format

The master provides the start condition, which is a rising edge after a LOW level. Then a

command byte which can be either a read or a write command is sent. Depending on the

command, the master or the slave has to send the data immediately after the command

sequence. If there is a read command, an additional handover or takeover bit is inserted

before and after the data bytes. The master must close each communication with a stop

condition. If the slave does not receive a rising edge for a time longer than tto, a timeout

condition occurs. The bus is reset to the idle state and waits for a start condition and a

new command. This behavior can be used to synchronize the device regardless of the

previous state.

All communication is based on this structure (see Figure 21), even for entering the

command mode. The customer can access the non-volatile memory, CTRL1, and

SIGNATURE registers (described in Section 16.5). Only a power-on reset leaves the

command mode. A more detailed description of the programming is given in the next

sections.

KMA320_A

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

Product data sheet

Rev. 6 — 18 May 2022

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