ISO8200BQ datasheet(19/37 Pages) STMICROELECTRONICS

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ISO8200BQ

Functional description

DocID027303 Rev 4

19/37

Figure 10: Direct control mode time diagram

6.3

Synchronous control mode (SCM)

When SYNC

and LOAD

inputs are independently driven, the device can operate in

synchronous control mode (SCM). The SCM is used to reduce the jittering of the outputs

and to drive all outputs of different devices at the same time.

In SCM the LOAD

signal is forced low to update the input buffer while the SYNC

signal is high. The LOAD

signal is raised and the SYNC

one is forced low for at least

tSYNC(SCM). During this period, the internal refresh is disabled and any pending transmission

between the low voltage and the isolated side is completed. When the SYNC

signal is

raised the channel output configuration is changed according to the one stored in the input.

If the tSYNC(SCM) limit is met, the maximum jitter of the channel outputs is tjitter(SCM).

If more devices share the same SYNC

signal, all device outputs change simultaneously

with a maximum jitter related to maximum delay and maximum jitter for single device.

Table 14: Interface signal operation in synchronous control mode

LOAD

SYNC

OUT_EN

Device behavior

Don’t

care

Don’t care

Low (1)

The outputs are disabled (turned off)

High

The outputs are left unchanged

Low

High

The input buffer is enabled

The outputs are left unchanged

High

Low

High

The internal refresh signal is disabled

The transmission buffer is updated

The outputs are left unchanged

High

Rising

edge

High

The outputs are updated according to the current transmission

buffer value

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