KMA310 datasheet(42/71 Pages) NXP

42 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

42 / 71

16.3.1 Write access

To write data to the non-volatile memory, perform the following procedure for write

access:

1. Start condition: The master drives a rising edge after a LOW level

2. Command: The master sends a write command (CMD0 = 0)

3. Data: The master sends two data bytes

4. Stop condition: The master drives a rising edge after a LOW level

Figure 24 shows the write access of the digital interface. The signal OWI represents

the data on the bus from the master or slave. The signals: master output enable and

slave output enable indicate when the master or the slave output is enabled or disabled,

respectively.

001aag743

master

output

enable

slave

output

enable

START

CMD7

CMD0

STOP

(1)

(2)

IDLE

WDATA15

WDATA0

OWI

1. Missing rising edges generate a timeout condition and the written data is ignored.

2. If the master does not drive the bus, the bus-pull defines the bus.

Figure 24. OWI write access

Note: As already mentioned in Section 16.1, use the write procedure to enter the

command mode. If command mode is not entered, communication is not possible and

the sensor operates in normal operation mode. After changing an address, the time

tprog must elapse before changing another address. After changing the contents of the

non-volatile memory, recalculate and write the checksum (see Section 16.4).

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