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 confi gured 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 11082 NXP temp sensors NE1617A NE1619_v3.indd 1 06-08-2008 09:16:0906-08-2008 09:16:09
