UM0934 datasheet(90/113 Pages) STMICROELECTRONICS

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Management information base (MIB)

UM0934

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Doc ID 17389 Rev 2

6.5.35

00D1h (ZC delay compensation)

This object stores the delay (

Δt) between the power line zero-crossing and the ST7570 zero-

crossing internal reference. The step is 13 µs.

The ST7570 changes its internal ZC reference as soon as the value is written on the MIB

object.

Equation 3

Figure 22.

ZC delay compensation

The confirm message of a CMD_ReadDBRequest returns the current constant without

changing it. The CMD_WriteDBRequest sets the corresponding time value and the confirm

message returns it.

Read/write confirm data format:

The same as request.

Table 146.

MIB object 00C2h: Write error data format

Byte

Returned value

Error description

ERR_ILLEGAL_DATA_COMMAND

Wrong number of data bytes

ERR_REQUEST_NOT_ALLOWED

The writing request failed

Table 147.

MIB object 00D1h: Write request data format

Byte

Label

Description

Available range

Factory default

0..2

ZC delay compensation

b0..19: 13µs delay steps

000000h .. 0FFFFFh

000000h

b20..23: unused

---

compensati

⋅

external ZC

events

internal ZC

reference

Δt

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