LNBP21 datasheet(7/20 Pages) STMICROELECTRONICS

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LNBP21

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LNBP1 SOFTWARE DESCRIPTION

INTERFACE PROTOCOL

The interface protocol comprises:

- A start condition (S)

- A chip address byte = hex 10 / 11 (the LSB bit

determines read(=1)/write(=0) transmission)

- A sequence of data (1 byte + acknowledge)

- A stop condition (P)

ACK= Acknowledge

S= Start

P= Stop

R/W= Read/Write

SYSTEM REGISTER (SR, 1 BYTE)

R,W= read and write bit

R= Read-only bit

All bits reset to 0 at Power-On

TRANSMITTED DATA (I2CBUS WRITE MODE)

When the R/W bit in the chip address is set to 0,

the main µP can write on the System Register

(SR) of the LNBP21 via I2C bus. Only 6 bits out of

the 8 available can be written by the µP, since the

re-maining 2 are left to the diagnostic flags, and

are read-only.

X= don't care.

Values are typical unless otherwise specified

RECEIVED DATA (I2C bus READ MODE)

The LNBP21 can provide to the Master a copy of

the SYSTEM REGISTER information via I2C bus

in read mode. The read mode is Master activated

by sending the chip address with R/W bit set to 1.

At the following master generated clocks bits, the

LNBP21 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

another

byte

from

the

LNBP21;

CHIP ADDRESS

DATA

MSB

LSB

MSB

LSB

0001000

R/W ACK

ACK

MSB

LSB

R, W

PCL

ISEL

TEN

LLC

VSEL

OTF

OLF

PCL

ISEL

TEN

LLC

VSEL

OTF

OLF

Function

001

VOUT=13V, VUP=16V Loopthrough switch open

011

VOUT=18V, VUP=21V Loopthrough switch open

101

VOUT=14V, VUP=17V Loopthrough switch open

111

VOUT=19V, VUP=22V Loopthrough switch open

22KHz tone is controlled by DSQIN pin

22KHz tone is ON, DSQIN pin disabled

IOUT(min)=500mA, IOUT(max)=650mA ISC=300mA

IOUT(min)=400mA, IOUT(max)=550mA ISC=300mA

Pulsed (dynamic) current limiting is selected

Static current limiting is selected

Power blocks disabled, Loopthrough switch closed

LNBP21 数据表(PDF) 7 Page - STMicroelectronics

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