LNBH221 software description (same for both section)

LNBH221

14/27

6.3

When the R/W bit in the chip address is set to 0, the main µP can write on the System

by the µP, since the remaining 2 are left to the diagnostic flags, and are read-only.

X= don't care.

Values are typical unless otherwise specified.

6.4

The LNBH221 can provide to the Master a copy of the SYSTEM REGISTER information via

R/W bit set to 1.

At the following master generated clocks bits, the LNBH221 issues a byte on the SDA data

bus line (MSB transmitted first).

At the ninth clock bit the MCU master can:

- acknowledge the reception, starting in this way the transmission of another byte from the

LNBH221;

- no acknowledge, stopping the read mode communication.

While the whole register is read back by the µP, only the two read-only bits OLF and OTF

convey diagnostic informations about the LNBH221.

Values are typical unless otherwise specified.

PCL

TTX

TEN

LLC VSEL

EN

OTF

OLF

Function

001

X

X

011

X

X

101

X

X

111

X

X

0

1

X

X

22KHz tone is controlled by DSQIN pin

1

1

X

X

22KHz tone is ON, DSQIN pin disabled

01

X

X

and LLC

1X

1X

X

output voltage level controlled by VSEL and LLC

0

1

X

X

Pulsed (dynamic) current limiting is selected

1

1

X

X

Static current limiting is selected

XXXX

X

0

XX

Power blocks disabled

PCL

ISEL

TEN

LLC VSEL

EN

OTF

OLF

Function

These bits are read exactly the same as

they were left after last write operation