Rainbow-electronics MAX6871 Instrukcja Użytkownika Pobierz pdf (Strona 1)

General Description

The MAX6870/MAX6871 EEPROM-configurable, multi-

voltage supply sequencers/supervisors monitor several

voltage detector inputs, two auxiliary inputs, and four

general-purpose logic inputs. The MAX6870/MAX6871

feature programmable outputs for highly configurable

power-supply sequencing applications. The MAX6870

features six voltage detector inputs and eight program-

mable outputs, while the MAX6871 features four voltage

detector inputs and five programmable outputs. Manual

reset and margin disable inputs offer additional flexibility.

All voltage detectors offer two configurable thresholds

for undervoltage/overvoltage or dual undervoltage

detection. One high voltage input (IN1) provides detec-

tor threshold voltages from +2.5V to +13.2V in 50mV

increments, or from +1.25V to +7.625V in 25mV incre-

ments. A bipolar input (IN2) provides detector threshold

voltages from ±2.5V to ±15.25V in 50mV increments, or

from ±1.25V to ±7.625V in 25mV increments. Positive

inputs (IN3–IN6) provide detector threshold voltages

from +1V to +5.5V in 20mV increments, or from +0.5V

to +3.05V in 10mV increments.

Programmable output stages control power-supply

sequencing or system resets/interrupts. Programmable

output options include: active-high, active-low, open-

drain, weak pullup, push-pull, and charge pump.

Programmable timing delay blocks configure each output

to wait between 25µs and 1600ms before deasserting. A

fault register logs the condition that caused each output

to assert (undervoltage, overvoltage, manual reset, etc.).

An internal 10-bit ADC monitors the voltage detector

inputs, and two auxiliary inputs through a multiplexer

that automatically sequences through all inputs every

200ms. A SMBus

-/I

-compatible, serial data inter-

face programs and communicates with the configuration

EEPROM, the configuration registers, the internal 4kb

user EEPROM, the ADC registers, and the fault registers

of the MAX6870/MAX6871.

The MAX6870/MAX6871 are available in a 7mm x 7mm

x 0.8mm 32-pin thin QFN package and operate over

the extended -40°C to +85°C temperature range.

Applications

Telecommunications/Central Office Systems

Networking Systems

Servers/Workstations

Basestations

Storage Equipment

Multimicroprocessor/Voltage Systems

Features

♦ Six (MAX6870) or Four (MAX6871) Configurable

Input Voltage Detectors

One High Voltage Input (+1.25V to +7.625V or

+2.5V to +13.2V Thresholds)

One Bipolar Voltage Input (±1.25V to ±7.625V

or ±2.5V to ±15.25V Thresholds)

Four (MAX6870) or Two (MAX6871) Positive

Voltage Inputs (+0.5V to +3.05V or +1V to

+5.5V Thresholds)

♦ Four General-Purpose Logic Inputs

♦ Two Configurable Watchdog Timers

♦ Eight (MAX6870) or Five (MAX6871)

Programmable Outputs

Active-High, Active-Low, Open-Drain, Weak

Pullup, Push-Pull, Charge-Pump

Timing Delays from 25µs to 1600ms

♦ 10-Bit Internal ADC Monitors the Input Voltage

Detectors and Two Auxiliary Inputs

♦ Margining Disable and Manual Reset Controls

♦ Internal 1.25V Reference or External Reference

Input

♦ 4kb Internal User EEPROM

Endurance: 100,000 Erase/Write Cycles

Data Retention: 10 Years

♦ I

C/SMBus-Compatible Serial

Configuration/Communication Interface

♦ ±1% Threshold Accuracy

MAX6870/MAX6871

EEPROM-Programmable Hex/Quad

Power-Supply Sequencers/Supervisors with ADC

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3384; Rev 1; 9/04

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

EVALUATION KIT

AVAILABLE

Pin Configurations, Typical Operating Circuit, and Selector

Guide appear at end of data sheet.

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX6870ETJ

-40°C to +85°C 32 Thin QFN

T3277-2

MAX6871ETJ

-40°C to +85°C 32 Thin QFN

T3277-2

SMBus is a trademark of Intel Corp.

C is a trademark of Philips Corp.

Purchase of I

C components from Maxim Integrated Products,

Inc., or one of its sublicensed Associated Companies, conveys

a license under the Philips I

C Patent Rights to use these com-

ponents in an I

C system, provided that the system conforms

to the I

C Standard Specification as defined by Philips.

1 2 3 4 5 6 ... 50 51

Podsumowanie treści

Strona 1 - EEPROM-Programmable Hex/Quad

General DescriptionThe MAX6870/MAX6871 EEPROM-configurable, multi-voltage supply sequencers/supervisors monitor severalvoltage detector inputs, two au

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MAX6870/MAX6871Detailed DescriptionThe MAX6870/MAX6871 EEPROM-configurable, multi-voltage supply sequencers/supervisors monitor severalvoltage-detecto

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC12 ____________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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Set the primary and secondary threshold voltages foreach voltage-detector input with registers 00h–0Bh.Each primary threshold voltage must be an under

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where VTHis the desired threshold voltage and x is thedecimal code for the desired threshold (Table 3).IN3–IN6IN3–IN6 offer positive voltage detectors

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC16 ____________________________________________________________

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AUXIN1 and AUXIN2The AUXIN1 and AUXIN2 high-impedance analog inputsare intended to monitor two additional system voltagesnot required for power-supply

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MAX6870/MAX6871MARGINMARGIN allows system-level testing while power sup-plies exceed the normal ranges. Registers 41h and 42hdetermine whether the pro

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REFINThe MAX6870/MAX6871 feature an internal +1.25V volt-age reference. The voltage reference sets the thresholdof the voltage detectors and provides

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC2 _____________________________________________________________

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MAX6870/MAX6871Table 10 only applies to PO1 of the MAX6870. Write a 0to a bit to make the PO1 output independent of therespective signal (IN1–IN6 prim

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Table 11 only applies to PO2 of the MAX6870. Write a 0to a bit to make the PO2 output independent of therespective signal (IN1–IN6 primary or secondar

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MAX6870/MAX6871Table 12 only applies to PO3 of the MAX6870 and PO1of the MAX6871. Write a 0 to a bit to make the PO3/PO1output independent of the resp

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Table 13 only applies to PO3 of the MAX6870 and PO1of the MAX6871. Write a 0 to a bit to make the PO3/PO1output independent of the respective signal (

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MAX6870/MAX6871Table 14 only applies to PO4 of the MAX6870 and PO2of the MAX6871. Write a 0 to a bit to make the PO4/PO2output independent of the resp

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Table 15 only applies to PO4 of the MAX6870 and PO2of the MAX6871. Write a 0 to a bit to make the PO4/PO2output independent of the respective signal (

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MAX6870/MAX6871Table 16 only applies to PO5 of the MAX6870 and PO3of the MAX6871. Write a 0 to a bit to make the PO5/PO3output independent of the resp

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Table 17 only applies to PO5 of the MAX6870 and PO3of the MAX6871. Write a 0 to a bit to make the PO5/PO3output independent of the respective signal (

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MAX6870/MAX6871Table 18 only applies to PO6 of the MAX6870 and PO4of the MAX6871. Write a 0 to a bit to make the PO6/PO4output independent of the resp

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Table 19 only applies to PO6 of the MAX6870 and PO4of the MAX6871. Write a 0 to a bit to make the PO6/PO4output independent of the respective signal (

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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MAX6870/MAX6871Table 20 only applies to PO7 of the MAX6870 and PO5of the MAX6871. Write a 0 to a bit to make the PO7/PO5output independent of the resp

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Table 21 only applies to PO8 of the MAX6870. Write a 0to a bit to make the PO8 output independent of therespective signal (IN1–IN6 primary or secondar

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC32 ____________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC34 ____________________________________________________________

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condition frees the bus for another transmission. The busremains active if a REPEATED START condition is gener-ated, such as in the block read protoco

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MAX6870/MAX6871SA7 through SA4 represent the standard interfaceaddress (1010) for devices with EEPROM. SA3 and SA2correspond to the A1 and A0 address

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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MAX6870/MAX6871directed into the user EEPROM. If the command code is80h, the data byte must be in the range of 00h to 45h. Ifthe command code is 81h o

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address pointer automatically increments after eachdata byte, except when the address pointer is alreadyat 45h. If the address pointer is already 45h,

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC4 _____________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC40 ____________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC42 ____________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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MAX6870/MAX6871and WDI_ bits assert if any of the GPI_ inputs are config-ured as watchdog inputs (WDI_) and a watchdog faultoccurs. Configuration Lock

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Applications InformationConfiguration Download at Power-upThe configuration of the MAX6870/MAX6871 (undervolt-age/overvoltage thresholds, PO_ timeout

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MAX6870/MAX6871Forcing ProgrammableOutputs High During Power-UpA weak 10µA pulldown holds all programmable outputslow during power-up until ABP exceed

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Temperature Sensor OutputsFigure 11 shows the MAX6870/MAX6871 in a tempera-ture-sensing application with the DS600. The DS600generates an analog outpu

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC48 ____________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC50 ____________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADCMaxim cannot assume responsibility for use of any circuitry oth

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC6 _____________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC8 _____________________________________________________________

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MAX6870/MAX6871EEPROM-Programmable Hex/QuadPower-Supply Sequencers/Supervisors with ADC_______________________________________________________________

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