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General Description

The MAX1361/MAX1362 low-power, 10-bit, 4-channel,

analog-to-digital converters (ADCs) feature a digitally

programmable window comparator with an interrupt out-

put for automatic system-monitoring applications. Once

configured, monitor mode automatically asserts an inter-

rupt when any analog input exceeds the programmed

upper or lower thresholds, without interaction to the

host. The MAX1361/MAX1362 respond to the SMBus™

alert, allowing quick identification of the alarming device

on a shared interrupt. A programmable delay between

monitoring intervals lowers power consumption at

reduced monitoring rates.

In addition, the MAX1361/MAX1362 integrate an inter-

nal voltage reference, a clock, and a 1.7MHz, high-

speed, I

C™-compatible, 2-wire, serial interface. The

optimized interface allows a maximum conversion rate

of 94.4ksps in normal mode while reading back the

conversion results. Each of the four analog inputs is

configurable for single-ended or fully differential opera-

tion and unipolar or bipolar operation. Two scan modes

utilize on-chip random access memory (RAM) to allow

eight conversions of a selected channel or scanning of

a group of channels to reduce interface overhead.

These devices operate from a single 2.7V to 3.6V

(MAX1361) or 4.5V to 5.5V (MAX1362) supply and

require only 436µA at the maximum sampling rate of

150ksps in monitor mode and 670µA at the maximum

sampling rate of 94.4ksps. AutoShutdown™ powers

down the devices between conversions, reducing sup-

ply current to less than 0.5µA when idle.

The full-scale analog-input range is determined by the

internal reference or by an externally applied reference

voltage ranging from 1V to V

. The MAX1361 features

a 2.048V internal reference, and the MAX1362 features

a 4.096V internal reference.

The MAX1361/MAX1362 are available in a 10-pin

µMAX

package and are specified over the extended

(-40°C to +85°C) temperature range. For 12-bit applica-

tions, refer to the pin-compatible MAX1363/MAX1364

data sheet.

Applications

System Monitoring/Supervision

Servers/Workstations

High Reliability Power Supplies

Medical Instrumentation

Features

♦ Monitor Mode

Programmable Lower/Upper Trip Threshold

Alarm-Status Register Records Fault Events

SMBus Alert Response

Programmable Sampling Intervals

♦ 10-Bit I

C-Compatible ADC

±1 LSB INL, ±1 LSB DNL

♦ 4-Channel Single-Ended or 2-Channel Fully

Differential Inputs

♦ Software Programmable Bipolar/Unipolar

Conversions

♦ Fast Sampling Rate

94.4ksps While Continuously Reading

Conversions

150ksps in Monitor Mode

♦ High-Speed I

C-Compatible Serial Interface

100kHz/400kHz Standard/Fast Mode

Up to 1.7MHz High-Speed Mode

6 Available I

C Slave Addresses

♦ Single Supply

2.7V to 3.6V (MAX1361)

4.5V to 5.5V (MAX1362)

♦ Internal Reference

2.048V (MAX1361)

4.096V (MAX1362)

♦ External Reference: 1V to V

♦ Low Power

436µA in Monitor Mode (150ksps)

670µA at 94.4ksps

6µA at 1ksps

0.5µA in Power-Down Mode

♦ Small Package

10-Pin µMAX

MAX1361/MAX1362

4-Channel, 10-Bit, System Monitors with Programmable

Trip Window and SMBus Alert Response

________________________________________________________________ Maxim Integrated Products 1

Ordering Information/Selector Guide

19-3268; Rev 1; 7/04

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.

PART TEMP RANGE PIN-PACKAGE I

C SLAVE ADDRESS

SUPPLY VOLTAGE (V)

MAX1361EUB -40°C to +85°C 10 µMAX 0110100/0110101 2.7 to 3.6

MAX1361LEUB* -40°C to +85°C 10 µMAX 0110010/0110011 2.7 to 3.6

MAX1361MEUB* -40°C to +85°C 10 µMAX 0110110/0110111 2.7 to 3.6

SMBus is a trademark of Intel Corporation.

C is a trademark of Philips Corporation. Purchase of I

C compo-

nents from Maxim Integrated Products, Inc. or one of its subli-

censed Associated Companies, conveys a license under the

Philips I

C Patent Rights to use these components in an I

C sys-

tem, provided that the system conforms to the I

C Standard

Specification as defined by Philips.

AutoShutdown is a trademark of Maxim Integrated Products, Inc.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Typical Operating Circuit and Pin Configuration appear at

end of data sheet.

Ordering Information/Selector Guide continued at end of data sheet.

*Future product—contact factory for availability.

1 2 3 4 5 6 ... 23 24

MAX1361/MAX1362 1

Indice de contenidos

Pagina 1 - MAX1361/MAX1362

General DescriptionThe MAX1361/MAX1362 low-power, 10-bit, 4-channel,analog-to-digital converters (ADCs) feature a digitallyprogrammable window compara

Pagina 2

MAX1361/MAX1362Power SupplyThe MAX1361 (2.7V to 3.6V) and MAX1362 (4.5V to5.5V) operate from a single supply and consume670µA (typ) at sampling rates

Pagina 3

where RSOURCEis the analog-input source impedance,RIN= 2.5kΩ, and CIN= 22pF. For internal clock mode,tACQ= 1.5 / fSCL, and for external clock mode tAC

Pagina 4

MAX1361/MAX1362be addressed with a read command to obtain new con-version results.External ClockSee the Configuration/Setup Bytes (Write Cycle) sectio

Pagina 5

To generate a not-acknowledge condition, the receiverallows SDA to be pulled high before the rising edge ofthe acknowledge-related clock pulse, and le

Pagina 6

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with ProgrammableTrip Window and SMBus Alert Response14 _____________________________________________

Pagina 7

return to F/S mode. Use a repeated START condition(Sr) in place of a STOP condition to leave the busactive and the mode unchanged.Software Description

Pagina 8

MAX1361/MAX1362Reading a Conversion (Read Cycle)Initiate a read cycle to start a conversion sequence andto obtain conversion results. See the Scan Mod

Pagina 9

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with Programmable____________________________________________________________________________________

Pagina 10

MAX1361/MAX1362contains D7–D0. To read the next conversion result,issue an ACK. To stop reading, issue a NACK.When the MAX1361/MAX1362 receive a NACK,

Pagina 11

A 1 written to the reset alarm CH_ clears the alarm, oth-erwise no action occurs (Table 10). Deassert INT byclearing all alarms or by initiating an SM

Pagina 12

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with ProgrammableTrip Window and SMBus Alert Response2 ______________________________________________

Pagina 13

MAX1361/MAX1362To disable alarming on a specific channel, set the lowerthreshold to 0x800 and the upper threshold to 0x7FF forbipolar mode, or set the

Pagina 14

Resetting AlarmReset alarms by writing to monitor-setup data. See theConfiguring Monitor Mode section and Table 10.SMBus AlertThe SMBus-alert feature

Pagina 15

MAX1361/MAX1362MAX1361/MAX1362’s INL is measured using the end-point method.Differential NonlinearityDifferential nonlinearity (DNL) is the difference

Pagina 16

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with ProgrammableTrip Window and SMBus Alert Response________________________________________________

Pagina 17

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with ProgrammableTrip Window and SMBus Alert ResponseMaxim cannot assume responsibility for use of an

Pagina 18

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with ProgrammableTrip Window and SMBus Alert Response________________________________________________

Pagina 19

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with ProgrammableTrip Window and SMBus Alert Response4 ______________________________________________

Pagina 20

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with ProgrammableTrip Window and SMBus Alert Response________________________________________________

Pagina 21

Typical Operating Characteristics(VDD= 3.3V (MAX1361), VDD= 5V (MAX1362), fSCL= 1.7MHz, external clock, fSAMPLE= 94.4ksps, single-ended, unipolar, TA=

Pagina 22

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with ProgrammableTrip Window and SMBus Alert Response________________________________________________

Pagina 23

MAX1361/MAX13624-Channel, 10-Bit, System Monitor with ProgrammableTrip Window and SMBus Alert Response8 ______________________________________________

Pagina 24

Detailed DescriptionThe MAX1361/MAX1362 4-channel ADCs use succes-sive-approximation conversion techniques and fully dif-ferential input track/hold (T

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