Linear Technology DC1605B Guida rapida alla configurazione

dc1605bf

DEMO MANUAL DC1605B

DESCRIPTION

Programmable Hex

Voltage Supervisor Featuring

the LTC2936 with EEPROM

The DC1605B is a demonstration system that showcases

the LT C

2936,a6-channel I2C/SMBus voltage supervisor

with EEPROM. The LTC2936 simultaneously monitors up

to six power supply voltages and detects undervoltage and

overvoltage conditions. In addition the LTC2936 monitors

two GPI pins and is able to drive three GPIO pins to indicate

OV, UV, system reset, system alert, or other control signal.

The DC1605B is a single circuit board that contains the

LTC2936andsupportcircuitry to provide the ability to dem-

onstrate features and capabilities of the LTC2936 without

the need for external power supplies. The DC1605B demo

boardprovidesanaccuratevoltagesupervisionofsixchan-

nels and offers over/undervoltage thresholds in various

ranges and increments that are digitally programmable.

This demonstration system is supported by the

LTpowerPlay™ graphical user interface (GUI) which en-

ables complete control of all the features of the device.

Together, the LTpowerPlay software and DC1605B hard-

ware system create a powerful development environment

for designing and testing configuration settings of the

LTC2936. These settings can be stored in the device’s

internal EEPROM or in a file. This file can later be used

to order pre-programmed devices or to program devices

in a production environment. The software displays all of

the configuration settings and real time measurements

from the system supervisor and peripheral ICs. Telemetry

allows easy access and decoding of the fault log created

by the LTC2936. The board comes pre-programmed with

the EEPROM values appropriate for the six power supply

rails on the DC1605B. Just plug and play!

The LTC2936 chip is mounted on the topside of the board

with support ADC and DAC circuitry on the back.

The ADC provides voltage readings for all six voltage

supervisor inputs on the LTC2936 and also reads the GPI

and GPIO voltages. The DAC drives six programmable

voltages that are used to emulate the user’s system rails.

The extra support circuitry allows the user to evaluate L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

the LTC2936 quickly and without the need for external

voltmeters or power supplies.

The DC1605B demo board can be powered by an external

power supply, such as a 12VDC supply. Communication

with the software is provided through the DC1613 USB-to-

I2C/SMBus/PMBus Controller. The following is a checklist

of items which can be obtained from the LT C website or

LT C Field Sales.

nUSB-to-I2C/SMBus/PMBus Controller (DC1613)

nLTpowerPlay Software

DC1605B Features

nSupervise Six Power Supplies

nPowered from USB Dongle, Power Jack, or VIN

nI2C Adjustable OV/UV Trip Points

nGuaranteed Threshold Accuracy: ±1%

nI2C/SMBus Serial Interface

nInternal EEPROM

nSix Comparator Outputs

n256 Programmable Thresholds per Channel

nUp to Three Range Settings per Channel

nTw o General Purpose Inputs

nThree General Purpose Inputs/Outputs

nProgrammable Output Delays

nAutonomous Operation without Additional Software

nSupported by LTpowerPlay GUI

nLTC2936 Available in 24-Lead QFN and SSOP Packages

Design files for this circuit board are available at

http://www.linear.com/demo/DC1605B

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DEMO MANUAL DC1605B

PERFORMANCE SUMMARY

Specifications are valid over the full operating temperature range.

Common Characteristics

PARAMETER CONDITIONS MIN TYP MAX UNITS

Supply Input Voltage Range VPWR 3.4 13.9 V

VPWR = VDD33 3.2 3.4 V

V1 to V6 Threshold Accuracy ±1.0 %

V1 to V6 Monitoring Range Precision Range 0.2 1.2 V

Low Range 0.5 3.0 V

Medium Range 1.0 5.8 V

Table 1. Default Thresholds and GPIO Mappings

Vn_THR_LO Vn_THR_HI GPIO1 GPIO2 GPIO3 CMP

Default Thresholds OV ALERT UV

V1 3.2 3.4 Comp_Hi Comp_Hi Comp_Lo Comp_Lo

V2 2.4V 2.6V Comp_Hi Comp_Hi Comp_Lo Comp_Lo

V3 1.7V 1.9V Comp_Hi Comp_Hi Comp_Lo Comp_Lo

V4 1.4V 1.6V Comp_Hi Comp_Hi Comp_Lo Comp_Lo

V5 1.1V 1.3V Comp_Hi Comp_Hi Comp_Lo Comp_Lo

V6 0.95V 1.05V Comp_Hi Comp_Hi Comp_Lo Comp_Lo

Table 2. Default GPI Settings

MANUAL RESET MARGIN UVDISABLE AUX COMP

GPI1 ü

GPI2 ü

The following list contains terms used throughout the

document.

AUXC – Auxiliary Comparator. A GPI pin may be pro-

grammed to this function and map behavior to a GPIO

pin. Nominal VTH = 0.5V.

EEPROM – Non-volatile memory (NVM) storage used to

retain data after power is removed.

Margin – Term used typically in board level testing that

increases/decreases the output voltage to look for sensi-

tivity/marginality problems.

MARG – Ignore margining (OV and UV) when active (low).

A GPI pin may be programmed to this function and map

behavior to a GPIO pin. Nominal VTH = 1.0V.

GLOSSARY OF TERMS

MR – Manual Reset, Active Low. A GPI pin may be pro-

grammed to this function and map behavior to a GPIO pin,

and optionally clear the fault history. Nominal VTH = 1.0V.

NVM – Non-volatile memory, see EEPROM.

OV – Overvoltage, the result of a voltage comparison that

a pin voltage is above a programmable threshold voltage.

Rail– The final output voltage that theLTC2936supervises.

Supervise – The act of quickly responding (compared to

a fault setting) to a voltage condition that is compared to

pre-programmed values.

UV – Undervoltage, the result of a voltage comparison that

a pin voltage is below a programmable threshold voltage.

UVDIS – UV Disable. Ignore UVs when the pin is low. A

GPI pin may be programmed to this function and map

behavior to a GPIO pin. Nominal VTH = 1.0V.

dc1605bf

DEMO MANUAL DC1605B

THEORY OF OPERATION

GENERAL DESCRIPTION

The LTC2936 is a hex voltage supervisor which detects

an overvoltage or undervoltage and signals the system of

a fault condition. The chip has a dedicated power supply

pin, VPWR, and has an internal 3.3V regulator. The chip

may be powered either by powering VPWR with the on-

board 5V supply, with an external 3.4V to 13.9V supply,

or with an external 3.3V supply by tying VPWR and VDD33

pins together.

THE CHIP

The LTC2936 integrates six voltage supervisors with as-

sociated comparator outputs, two GPIs, and three GPIOs.

The V1-V6 supervisors are comprised of OV/UV window

comparators that can be programmed to map the detec-

tion of a fault to one or more GPIO pin.

In LTpowerPlay, the user programs each voltage supervi-

sor’s range, polarity, mapping, and high and low threshold

voltages.

Each channel’s high/low comparators may be mapped

to any GPIO pin, and any comparator may be mapped to

multiple GPIO pins. Typically the high comparator is used

for the overvoltage condition and the low comparator is

usedfor the undervoltage condition.Thehigh comparator is

notdedicatedas the OV detection nor is the

lowcomparator

dedicated forUVdetection. For example, both comparators

maybe configuredasOV with theVn_THR_HIsetto indicate

an OV Fault and the Vn_THR_LO set for an OV Warning.

Figure 1. Simplified Block Diagram of Voltage Supervisor Input

GPIO & CMP

MAPPING

(Vn_CONFIG)

HIGH THR

SETTING

LOW THR

SETTING

HIGH

COMPARATOR

LOW

COMPARATOR

LOW FAULT

HIGH FAULT

CMP1–CMP6

GPIO1–CPIO3

GPI1 GPI2 DC1605B F01

GPIO

INPUT OPTIONS

INPUT/INPUT

OUTPUT OPTIONS

OUTPUT/OUTPUT WITH OPEN DRAIN

OUTPUT/OUTPUT WITH PULL-UP

SMBALERT (LATCHED) WITH OPEN DRAIN OR WITH PULL-UP

INTERNAL

LOGIC

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DEMO MANUAL DC1605B

THEORY OF OPERATION

Figure 2. Simplified Block Diagram of the DC1605B

The GPI input pins can be used to override fault conditions

by configuring them as MARG or UVDIS. The active-low

MARG function allows the LTC2936 to ignore OV and UV

conditions. The active-low UVDIS function is a special

case of the MARG function. It allows the device to ignore

UV conditions.

voltages for a total of eleven. Although the ADC updates

at a relatively slow rate, it provides the equivalent of

eleven 4½-digit digital multimeters. Think of the ADC as

a collection of independent voltage readings, whereas the

LTC2936 simply makes a comparison to each of the Vn

inputvoltages. The simplestdemonstrationof the DC1605B

is to power and control the board via the DC1613 USB

controller. The controller provides 5V supply and I2C/

SMBus read/write control. This setup provides an easy

quick way to demonstrate the LTC2936’s capabilities.

GPIO

INPUT OPTIONS

MANUAL RESET

MARGIN

UV DISABLE

AUXC (NO PULL-UP)

INTERNAL

LOGIC

LTC2936

6-CH VOLTAGE

SUPERVISOR

WITH EEPROM

VPWR

GPIO1

GPIO2

GPIO3

GPI1

GPI2

BLUE/RED

GREEN

3.3VOUT

INT 5V,

EXT 3.3V,

OR EXT 4V TO 14V

V1-V6, GPI1-2, GPIO1-3

V1-V6

I2C BUS

24-BIT ADC

(LTC2499)

12-BIT ADC

(LTC2637)

POWER

SWITCH

(LTC4415)

5V LDO

(LT1761-5)

POWER JACK

6V TO 14V

GREEN

+5V FROM USB 5V

DC1605B F02

BLUE/RED

TOPSIDE COMPONENT

BOTTOM COMPONENT

COMP (1:6)

VDD33

EXT

INT

THE BOARD

The LTC2936 chip is mounted on the topside of the board

with support ADC and DAC circuitry on the back. The sup-

port circuitry is powered from 5V.

The ADC provides voltage readings for all six voltage

inputs to the LTC2936 and also reads the GPI and GPIO

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DEMO MANUAL DC1605B

THEORY OF OPERATION

may notice some lag in the update rate of the displayed

voltages.

SELECTING A DEVICE ADDRESS

The DC1605B has jumpers (JP7, JP8) labeled ASEL0 and

ASEL1 which allow the user to select one of nine I2C ad-

dresses. See Table 3.

Table 3. Address Selection of LTC2936

I2C ADDRESS (7-BIT)

ASEL1

POSITION

ASEL0

POSITION DEFAULT

0x50 L L •

0x51 L Z

0x52 L H

0x53 Z L

0x54 Z Z

0x55 Z H

0x58 H L

0x59 H Z

0x5A H H

Regardless of the jumper setting, the part will always

respond to the I2C global 7-bit addresses 0x0C and 0x73.

STATUS_WORD REGISTER

The STATUS_WORD register is a read-only register that

provides a summary of fault status on all six HI and LO

comparatoroutputs, and are determinedbythecomparator

threshold/configuration settings and Vnvoltages. Faults

may be disabled by setting GPI pins to MARG or UVDIS.

RESTORING RAM AND GUI FROM LTC2936

To restorethe operating memory (RAM)from the LTC2936

EEPROM contents, click the “R” NVM-to-RAM icon in the

toolbar. To read the RAM registers into the GUI, click the

“R” RAM-to-PC icon in the toolbar.

DC1605B LEDs

TheDC1605Bboard has two green LEDs. When USB power

(DC1613 Controller) or external power (6V to 14V jack) is

applied, the +5V green LED will illuminate. The +5V supply

provides power to the support circuitry, not necessarily to

the LTC2936. Jumper JP9 determines how the LTC2936

Themultichannel DAC emulates a6-channel programmable

power supply that is used to place “rail” voltages at levels

that replicate the user’s system rails. This avoids the need

for the user to wire actual supply rails to the demo board,

however the board was designed to allow this use case.

The DAC output range is 0V to 4V. This is sufficient for

demo purposes. Simply place the V1-V6 jumpers to “INT”

for internal DAC use, and ensure the LTC2936 is powered

by setting JP9 appropriately.

POWERING THE BOARD

The DC1605B board can be powered from the DC1613

USB’s 5V power or from a wall-powered 12V supply

(jack). The LTC2936 hex supervisor can be powered in a

number of different ways. The chip itself is powered from

the on-board 5V supply or an external supply. There is a

table silk-screened onto the board as a reminder. If the

USB power or jack power is present, the +5V LED will

illuminate. The LTC2936 can then be powered by setting

the jumper to “INT .” Alternatively set the jumper to “EXT”

to connect an external power supply voltage to the VPWR

turret. With JP9 set to “EXT,” apply an external 3.3V sup-

ply. If the jumper is removed, apply an external voltage in

the range 3.4V to 13.9V. The board comes pre-configured

with jumpers JP1-JP6 set to the INTERNAL position which

allows the on-board 5V LDO regulator to power all circuits.

NOTE: Turrets V1-V6 are tied directly to the LTC2936

independent of the jumper settings.

The DC1605B uses a multiplexed ADC that is used to

provide voltage readback values. The telemetry plot in

the GUI is similar to a multichannel oscilloscope which is

capable of displaying any parameter that is displayed in

the telemetry window. Due to the nature of a multiplexed

ADC converter, it has an associated ADC loop time. The

total ADC loop time is ~400ms for a given channel. You

dc1605bf

DEMO MANUAL DC1605B

THEORY OF OPERATION

is powered. The default setting of jumper JP9 is set to

internal 5V and the 3.3VOUT LED will illuminate, indicating

the LTC2936 is powered. If this LED is not illuminated,

the LTC2936 is not in a functioning state, the I2C bus will

not communicate with the GUI, and the LTC2936 will be

grayed out in the system tree.

DC1605B ToolWindow and GUI Indicators

The ToolWindow displays the ADC readings on the left and

DAC voltage settings on the right. The blue/red indicators

next to the GPIs and GPIOs display the state (H vs. L) and

voltage reading from the ADC (LT2499). Blue indicates a

logic high and red indicates a logic low. The ToolWindow

is automatically populated when LTpowerPlay detects the

DC1605B demo board when it starts. Note that when you

save aproject, the DAC settings are saved in the project file.

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DEMO MANUAL DC1605B

LTpowerPlay GUI SOFTWARE

LTpowerPlay is a powerful Windows-based development

environment that supports Linear Technology power

system management ICs with EEPROM, including the

LTC2936 6-channel voltage supervisor. The software

supports a variety of different tasks. You can use LTpow-

erPlay to evaluate Linear Technology ICs by connecting

to a demo board system. LTpowerPlay can also be used

in an offline mode (with no hardware present) in order to

build a multi-chip configuration file that can be saved and

re-loaded at a later time. LTpowerPlay provides unprec-

edented system level diagnostic and debug features. It

becomes a valuable diagnostic tool during board bring-up

to program or tweak the power management scheme in

a system or to diagnose power issues when bringing up

rails. LTpowerPlay utilizes the DC1613 I2C/SMBus/PMBus

controller to communicate with one of many potential tar-

gets, including the DC1605B demo system or a customer

board. The software also provides an automatic update

feature to keep the software current with the latest set

of device drivers and documentation. The LTpowerPlay

software can be downloaded from:

http://www.linear.com/ltpowerplay

To access technical support documents for LT C power

system management products visit “Help, View Online

Help” on the L

TpowerPlay menu.

Figure 3. Screenshot of the LTpowerPlay GUI

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DEMO MANUAL DC1605B

QUICK START PROCEDURE

Thefollowing proceduredescribeshow tosetup aDC1605B

demo system.

1. Downloadand install the LTpowerPlay GUI: www.linear.

com/ltpowerplay

2. Remove the board from the ESD protective bag and

place it on a level surface. Connect the DC1613 I2C/

SMBus/PMBus controller to the DC1605B board using

the 12-pin ribbon cable.

3. Plug the USB-to-I2C/SMBus/PMBus Controller into a

USB port on your PC. The board should power up with

+5V and +3.3VOUT LEDs illuminated green. The GPIO

and CMP LEDs will illuminate blue.

Figure 4. Connecting DC1605B Board and the DC1613 USB to I2C/SMBus/PMBus Controller

dc1605bf

DEMO MANUAL DC1605B

QUICK START PROCEDURE

4. Launch the LTpowerPlay GUI.

a. The GUI automatically identifies the DC1605B and

builds a system tree for each I2C device. The system

tree on the left hand side will look like this:

b. A green message box will be displayed momentarily

in the lower left hand corner confirming that the

DC1605B is communicating. The board at this point

is fully operational.

5. Load the Demo Configuration.

In the upper left hand corner of the GUI, select File >

Initialize DC1605B Demo > Demo Config (or Factory

Defaults). This will load the configuration settings into

the working RAM of the LTC2936, set the DAC outputs,

clear the status registers, and store the settings into

NVM (EEPROM). The ‘Demo Config’ file is the starting

point for the use cases. The ‘Factory Defaults’ file sets

the Vnthresholds that accommodate the initial powerup

state of the DAC outputs (2.048V).

SAVING A CONFIGURATION

You can make changes to the LTC2936 register values

and DAC settings. Save the demo board configuration to

a(*.proj) file by clicking the "Save" icon. This creates a

backup file. Name it whatever you like. Note that the DAC

settings are saved in the project file.

QUICK START VIDEO

There is a Quick Start Video that covers the basic features

of the LTC2936 chip and DC1605B demo board. The video

can be accessed via LTpowerPlay by navigating to the Help

menu > DC1605B Content.

LOADING A DC1605B CONFIGURATION (*.proj) FILE

WITH THE GUI

1. In the upper left hand corner of the GUI, File > Open

> browse to your *.proj file. This will load the file into

the GUI.

2. Click on the “Go Online” icon, then click on the “PC →

RAM” icon to write all registers. This loads the configu-

ration into the working RAM of the LTC2936. The DAC

settings are stored and retrieved from the .proj file.

3. To store the configuration to NVM (EEPROM), click on

the “RAM → NVM” icon

dc1605bf

DEMO MANUAL DC1605B

DC1605B DETAILS – TOP SIDE

Table 2. Default Jumper Configuration

REFERENCE

DESIGNATOR SIGNAL NAME USAGE DEFAULT

JP1 – JP6 V1 – V6 Selects internal vs external voltage INT

JP7, JP8 ASEL1, ASEL0 Selects H/Z/L for LTC2936 slave address L

JP9 VPWR Selects internal 5V, external 3.3V, or remove to apply 3.4V to 14V turret. INT

Figure 5. DC1605B Top Side Details

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