KMA310 datasheet(40/71 Pages) NXP

40 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

40 / 71

16 Programming

16.1 General description

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

pin OUT/DATA 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.

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 OUT/DATA 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.

During communication, the KMA310 is always the slave 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.

16.2 Timing characteristics

As described in the previous section, a start and stop condition is necessary for

communication. The LOW-level duration before the rising edge of the start condition

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