Precise thermal monitoring

with small, accurate temp sensors

Features

Ñ

NE1617A replaces MAX1617 and ADM1021

Ñ

Monitors internal and remote temperatures

Ñ

No calibration required

Ñ

Programmable alarm for over/under temperature conditions

Ñ

Programmable temperature/voltage limits to control internal

alarms – NE1619

Ñ

SMBus 2-wire serial interface

Ñ

NE1617A supply range: 3 to 5.5 V

Ñ

NE1619 supply range: 2.8 to 5.5 V

Ñ

Small 16-pin QSOP package

Applications

Ñ

Desktop and Notebook computers

Ñ

Smart battery packs

Ñ

Industrial controllers

Ñ

Telecom equipment

The NE1617A, a precise, 2-channel sensor, can measure

internal and remote temperatures and supports up to nine

devices per bus. During normal operation, the sensor updates

temperature data at a programmed rate, selectable from

125 ms to 16 seconds. An internal, one-shot command can

be used to force a temperature reading as needed.

These programmable, highly accurate temperature sensors, designed for applications where

thermal monitoring of hardware and electrical components is critical, have an operating

temperature range of 0 to 120 °C and are available in small, 16-pin QSOP packages.

The NE1619, a more advanced version of the NE1617A, can

monitor nine different voltages in addition to the internal and

remote temperature. It supports two devices per bus and has

programmable temperature and voltage limits for controlling

internal alarms. It uses a consistent conversion rate of

approximately 500 ms and has an on-chip A/D converter that

supports data collection and other functions.

Both sensors are equipped with an internal diode, so they can

monitor internal ambient temperatures. They can also measure

the internal temperature of a microprocessor that uses an

embedded diode. Both sensors are configured as slaves on

the SMBus system and communicate via a standard two-wire

serial interface (using SCLK and SDATA pins). They support

four SMBus protocols: Write Byte, Read Byte, Send Byte, and

Receive Byte. Data is transmitted serially in groups of nine bits,

using nine clock pulses, including an 8-bit data byte followed

by a 1-bit acknowledgement. The system microprocessor is

typically used as the master, initiating start, stop, and clock

signals.

NXP temperature sensors

NE1617A & NE1619

1082 NXP temp sensors NE1617A NE1619_v3.indd 1

1082 NXP temp sensors NE1617A NE1619_v3.indd 1

06-08-2008 09:16:09

06-08-2008 09:16:09