LTM4677 datasheet(65/110 Pages) AD

65 / 110 page

LTC3888-1

Rev. 0

For more information www.analog.com

APPLICATIONS INFORMATION

INTERFACING TO THE DC1613

The ADI DC1613 USB-to-I2C/SMBus/PMBus control-

ler can be interfaced to the LTC3888-1 on any board for

programming, telemetry and system debug. This includes

the DC2652 from Analog Devices, or any customer tar-

get system. The controller, when used in conjunction

with LTpowerPlay, provides a powerful way to debug an

entire power system. Faults are quickly diagnosed using

telemetry, status registers and the fault log. A final design

configuration can be quickly developed and stored to the

LTC3888-1 EEPROM and/or LTpowerPlay configuration file.

The DC1613 can communicate with, program and even

power one or more LTC3888-1devices, regardless of

whether system power is present. The DC2086 Powered

Programming Adapter can be used to extend the power

sourcing capability of the DC1613. Figure 45 illustrates

an application schematic for in-system programming

of multiple LTC3888-1 devices normally powered from

VIN. If the DC2086 is used, PFETs with lower RDS(ON),

such as the SiA907EDJT, should be used in place of the

Si2305CDS devices. If system power is not present, the

an Analog Devices demo circuit or user application.

LTpowerPlay can also be used offline (no hardware pres-

ent) to build multiple IC configuration files that can be

saved and later reloaded. LTpowerPlay uses the DC1613

USB-to-I2C/SMBus/PMBus controller to communicate

with a system for evaluation, development or debug. The

software also features automatic update to remain up-to-

date with the latest application code and documentation

available from Analog Devices. A great deal of context

Figure 44. Example of a Polling Loop to Write VOUT_COMMAND

// wait until bits 6, 5, and 4 of MFR_COMMON are all set

{

mfrCommonValue = PMBUS_READ_BYTE(0xEF);

partReady = (mfrCommonValue & 0x68) == 0x68;

}while(!partReady)

// now the part is ready to receive the next command

PMBUS_WRITE_WORD(0x21, 0x2000); //write VOUT_COMMAND to 2V

sensitive help is available within LTpowerPlay, along with

several tutorials.

Figure 45. DC1613 Connections

VIN

VDD33

VDD25

SDA

2.2µF

VGS MAX ON THE Si2305CDS IS 12V, IF VIN > 20V

CHANGE THE RESISTOR DIVIDER ON THE PFET GATE

1µF

388812 F45

10k

100k

Si2305CDS

ISOLATED

3.3V

SDA

SCL

Si2305CDS

100k

ADI

CONTROLLER

HEADER

TO DC1613

USB TO I2C/SMBus/PMBus

CONTROLLER

SCL

GND

LTC3888-1

VIN

VDD33

SDA

SCL

GND

LTC3888-1

10k

VDD25

LTM4677 Datasheet(PDF) 65 Page - Analog Devices

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