Functional description

ISO8200B

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Doc ID 023802 Rev 1

6.2

Direct control mode (DCM)

When SYNC and LOAD inputs are driven by the same signal, the device operates in direct

control mode (DCM).

In DCM the SYNC / LOAD signal operates as an active low input enable:

●

when the signal is high, the current output configuration is kept regardless of the input

values

●

when the signal is low, each channel input directly drives the respective output

This operation mode can also be set by shorting both the signals to the digital ground; in this

case the channel outputs are always directly driven by the inputs except when OUT_EN is

low (outputs disabled).

Figure 9.

Direct control mode IC configuration

Table 14.

Interface signal operation in direct control mode

SYNC / LOAD

OUT_EN

Device behavior

Don’t care

1.

The outputs are turned off on OUT_EN falling edge and they are kept disabled as long as it is low.

The outputs are disabled (turned off).

High

High

The outputs are left unchanged.

Low

High

The channel inputs drive the outputs.

Vdd

Vdd

GNDdd

GND

Vdd

LOAD

OUT_EN

IN1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

SYNC

FAULT

Vdd

MCU

ISO8200

LOAD

OUT_EN

Vdd

Vdd

IN1

IN2

IN3

IN4

IN5

IN6

IN7

IN8

GNDdd

GND

SYNC

FAULT

Vdd

Vdd

MCU

ISO8200

Inputs are enabled by MCU through

the SYNC/LOAD signals

Inputs are always enabled

(outputs can be disabled through OUT_EN)

GPIO

GPIO

AM14897v1