L6364 datasheet(14/60 Pages) STMICROELECTRONICS

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DIO pin

The DIO pin is a fully protected I/O which is driven or sampled independently via SPI. This pin may be operated in

one of two modes:

•

JOIN mode (DCTL:DIO bit = '0').

This is the default configuration for DCTL:DIO bit. The DIO/CQ outputs function together to provide a single,

double drive strength, IO-Link conformal output. The outputs, DIO and CQ, must be externally shorted

together. When in this mode, the DCTL:HS and DCTL:LS no longer have any effect on the output state.

•

DIO mode (DCTL:DIO bit = '1').

The DIO line functions as independent high voltage digital input output pin. Setting bit DCTL:IEN in this

mode, enables a signal level change interrupt, informing the microcontroller that a level change has occurred

on the DIO line.

7.1

DIO mode output control

In DIO mode there are two alternatives for controlling the pin output state: via SPI (DCTL:EXT reset) or

directly via pin CTLD (DCTL:EXT set). Table 16 and Table 17 show how the output is controlled in both cases

respectively.

Table 16. DIO control via SPI-DCTL:EXT=’0’

Mode

DCTL:HS

DCTL:LS

DIO Channel Output State

Off

HiZ

Low

High

Illegal

HiZ

If bit DCTL:EXT is set, bits DCTL:HS and DCTL:LS function as configuration bits, which configure the DIO output

to be a PNP, NPN or Push-Pull driver.

Table 17. Direct DIO control via pin CTLD – DCTL:EXT=’1’

DIO Channel Output State

Mode

DCTL:HS

DCTL:LS

CTLD=’1’

CTLD=’0’

Inactive

HiZ

NPN

HiZ

PNP

HiZ

Push-Pull

The high- and low-side switches are identical and have an on-state resistance of RSW. Any inactive switch acts as

a Zener diode limiting the voltage on the DIO line to VZEN above VVPLUS (high-side switch), or VZEN below GND

(low-side switch). This allows rapid switch-off for inductive loads.

The DIO data level is monitored for signals, filtering out pulses with a duration of less than (1/16) * TBIT, see

Table 5.

The decision threshold for the DIO data level is determined by the CFG:RF bit. Where this is '0', the IO-link

standard absolute levels are used, and where the bit is '1' the threshold is referred to VVPLUS/1.8.

L6364

DIO pin

DS13363 - Rev 4

page 14/60

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