UM0934 datasheet(20/113 Pages) STMICROELECTRONICS

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Physical layer

UM0934

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Doc ID 17389 Rev 2

SPY_SubframeIndication, Section 5.3.18, SPY_No_SubframeIndication, Section 5.3.17).

Such gain value is useful to estimate the input signal amplitude.

3.6.4

Electrical delta-phase detection

During the reception of a valid sequence of preamble and SSD bytes, the ST7570

automatically performs a measurement of the mains phase difference between the local

zero-crossing reference and the received sequence. The result is then written into the MIB

object 000Eh (S1, N1, phase, Section 6.5.15) and automatically provided through

unsolicited indications (CMD_DataIndication, Section 5.3.11,

SPY_SubframeIndication,Section 5.3.18, SPY_No_SubframeIndication, Section 5.3.17).

The meaning of each code is described in Table 4:

3.6.5

Transmitting digital gain

The level of the output signal can be digitally adjusted by accessing the MIB object 0082h

(TX output gain and current limiting, Section 6.5.24), controlling the gain control block

depicted in Figure 6.

Figure 6.

ST7570 transmission path block diagram

The amplitude of the transmitted signal can be set on a 32-step logarithmic scale through

the target output gain parameter of the MIB object 0082h, introducing an attenuation ranging

from 0 dB (typ.), down to -31 dB (typ.).

For further details refer to [1].

Table 4.

Electrical delta-phase coding

Value returned

by the ST7570

Delta-phase [degree °]

1200 bps

2400 bps

Not valid

0 or +180

+60

+60 or -120

+120

+120 or -60

+180

+180 or 0

-120

-120 or +60

-60

-60 or +120

TX AFE

DAC

Gain

Control

TX_OUT

Target

Output Gain

BPF

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