ISO8200B datasheet(19/33 Pages) STMICROELECTRONICS

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ISO8200B

Functional description

Doc ID 023802 Rev 1

19/33

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 the outputs of different devices at the same time.

In SCM the LOAD signal is forced low in order to update the input buffer while the SYNC

signal is high. After that, 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 devices.

INX

SYNC

LOAD

OUTX

Internal

refresh

th(IN)

tdis(DMC)

tINLD

tLDIN

td(ON)DCM

td(OFF)DCM

1/frefresh

tsu(IN)

tw(IN)

AM14898v1

ISO8200B Datenblatt(PDF) 19 Page - STMicroelectronics