MAX1617MEE+T【PDF 6/20 页】IC REMOTE/LOCAL TEMP SNSR 16QSOP

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Remote/Local Temperature Sensor

with SMBus Serial Interface

MAX1617

Maxim Integrated

______________________________________________________________Pin Description

_______________Detailed Description

The MAX1617 is a temperature sensor designed to

work in conjunction with an external microcontroller

(礐) or other intelligence in thermostatic, process-con-

trol, or monitoring applications. The 礐 is typically a

power-management or keyboard controller, generating

SMBus serial commands by bit-banging general-pur-

pose input-output (GPIO) pins or via a dedicated

SMBus interface block.

Essentially an 8-bit serial analog-to-digital converter

(ADC) with a sophisticated front end, the MAX1617

contains a switched current source, a multiplexer, an

ADC, an SMBus interface, and associated control logic

(Figure 1). Temperature data from the ADC is loaded

into two data registers, where it is automatically com-

pared with data previously stored in four over/under-

temperature alarm registers.

ADC and Multiplexer

The ADC is an averaging type that integrates over a

60ms period (each channel, typical), with excellent

noise rejection.

The multiplexer automatically steers bias currents

through the remote and local diodes, measures their

forward voltages, and computes their temperatures.

Both channels are automatically converted once the

conversion process has started, either in free-running

or single-shot mode. If one of the two channels is not

used, the device still performs both measurements, and

the user can simply ignore the results of the unused

channel. If the remote diode channel is unused, tie DXP

to DXN rather than leaving the pins open.

The DXN input is biased at 0.65V typical above ground

by an internal diode to set up the analog-to-digital (A/D)

inputs for a differential measurement. The typical

DXPDXN differential input voltage range is 0.25V to

0.95V. To ensure proper operation over full temperature

range, ensure V

DXP

d (0.78 x V

- 1.1) volts.

Excess resistance in series with the remote diode caus-

es about +1/2癈 error per ohm. Likewise, 200礦 of off-

set voltage forced on DXPDXN causes about 1癈 error.

SMBus Serial-Data Input/Output, open drain

SMBDATA

SMBus Serial-Clock Input

SMBCLK

Hardware Standby Input. Temperature and comparison threshold data are retained in standby mode.

Low = standby mode, high = operate mode.

STBY

SMBus Address Select pin (Table 8). ADD0 and ADD1 are sampled upon power-up. Excess capacitance

(>50pF) at the address pins when unconnected may cause address-recognition problems.

ADD1

Ground

GND

7, 8

SMBus Slave Address Select pin

ADD0

SMBus Alert (interrupt) Output, open drain

ALERT

Combined Current Sink and A/D Negative Input. DXN is normally biased to a diode voltage above

ground.

DXN

Combined Current Source and A/D Positive Input for remote-diode channel. Do not leave DXP uncon-

nected; tie DXP to DXN if no remote diode is used. Place a 2200pF capacitor between DXP and DXN for

noise filtering.

DXP

Supply Voltage Input, 3V to 5.5V. Bypass to GND with a 0.1礔 capacitor. A 200?series resistor is recom-

mended but not required for additional noise filtering.

No Connection. Not internally connected. May be used for PCB trace routing.

N.C.

1, 5, 9,

13, 16

FUNCTION

NAME

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