KMA310 datasheet(41/71 Pages) NXP

41 / 71 page

NXP Semiconductors

KMA310

Programmable angle sensor IC

KMA310

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Product data sheet

Rev. 3 — 27 February 2019

41 / 71

is defined as tstart. The HIGH-level duration after the rising edge of the stop condition

is defined as tstop. These parameters, together with all other timing characteristics are

shown in Table 45.

001aag817

tstart

tstop

Figure 22. OWI start and stop condition

Figure 23 shows the coding of a single bit with a HIGH level of VIH and a LOW level of

VIL. Here the pulse width tw1 or tw0 represents a logic 1 or a logic 0 of a full bit period Tbit,

respectively.

001aag818

0.175

bit = 0

bit = 1

0.25

0.375

Tbit

tw0

tw1

0.625

0.75

0.825

Tbit

Figure 23. OWI timing

16.3 Sending and receiving data

The master has to control the communication during sending or receiving data. The

command byte defines the address and type of command the master requests. Read

commands need an additional handover or takeover bit. Insert this bit before and after

the two data bytes (see Figure 21). However, the OWI is a serial data transmission,

whereas the MSB is sent at first.

Table 47. Format of command byte

CMD7

CMD6

CMD5

CMD4

CMD3

CMD2

CMD1

CMD0

Table 48. Command byte description

Bit

Symbol

Description

7 to 1

CMD[7:1]

address bits

0 = write

CMD0

1 = read

A more detailed description of all customer accessible registers is given in Section 16.5.

Both default value and the complete command including the address and write or read

request are also listed.

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