LTC4449 datasheet(35/48 Pages) AD

35 / 48 page

LTC7872

Rev. 0

For more information www.analog.com

Multidrop Configuration

Several LTC7872s may share the serial bus. In this multidrop configuration, SCLK, SDI, and SDO are common between

all parts. The serial bus master must use a separate CSB for each LTC7872 and ensure that only one device has CSB

asserted at any time during the serial port read sequence. It is recommended to attach a high value resistor to SDO to

ensure the line returns to a known level during Hi-Z states.

Serial Port Register Definition

Table 7. Register Summary

Address

(7 bits)

Description

TYPE

DEFAULT

VALUE

MFR_FAULT

0x01

One byte summary of the unit’s fault condition.

MFR_OC_FAULT

0x02

One byte summary of the unit’s overcurrent fault condition.

MFR_NOC_FAULT

0x03

One byte summary of the unit’s negative overcurrent fault condition.

MFR_STATUS

0x04

One byte summary of the unit’s operation status.

MFR_CONFIG1

0x05

One byte summary of the unit’s configuration

MFR_CONFIG2

0x06

One byte summary of the unit’s configuration

MFR_CHIP_CTRL

0x07

[3] = Communication Fault, [1] = Sticky Bit, [0] = Write Protection

R/W

0x00

MFR_IDAC_VLOW

0x08

Adjust the IDAC_VLOW to program VLOW voltage.

R/W

0x00

MFR_IDAC_VHIGH

0x09

Adjust the IDAC_VHIGH to program VHIGH voltage.

R/W

0x00

MFR_IDAC_SETCUR

0x0A

Adjust the IDAC_SETCUR to program SETCUR pin’s sourcing current.

R/W

0x00

MFR_SSFM

0x0B

Adjust the spread spectrum frequency modulation parameters.

R/W

0x00

RESERVED

0x0C

0x0D

0x0E

0x0F

SERIAL PORT REGISTER DETAILS

MFR_FAULT

The MFR_FAULT returns a one-byte summary of the most critical faults.

MFR_FAULT Register Contents:

BIT

NAME

VALUE MEANING

Reserved

VLOW_OV

The OVLOW pin is higher than 1.2V threshold.

VHIGH_OV

The OVHIGH pin is higher than 1.2V threshold.

VHIGH_UV

The UVHIGH pin is less than 1.2V threshold.

DRVCC_UV

The DRVCC pin is undervoltage.

V5_UV

The V5 pin is undervoltage.

VREF_BAD

The internal reference self-check fails.

OVER_TEMP

An over temperature fault has occurred.

APPLICATIONS INFORMATION

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