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NE1618 Datasheet(PDF) 2 Page - NXP Semiconductors

Part No. NE1618
Description  Temperature monitor for microprocessor systems
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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NE1618 Datasheet(HTML) 2 Page - NXP Semiconductors

 
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Philips Semiconductors
Product data
NE1618
Temperature monitor for microprocessor systems
2
2002 Jan 04
853–2299 27510
FEATURES
Monitors local and remote temperature
Accuracy
± 2 °C local (on-chip) sensor
± 1.5 °C remote sensor with 1 °C resolution
± 1.0 °C remote sensor with 0.125 °C resolution
No calibration required
Programmable over/under temperature alarm
SMBus 2-wire serial interface
3 V to 3.6 V supply range
80 µA supply current in operating mode
3 µA (typical) supply current in standby mode
Small 16-lead QSOP package
APPLICATIONS
Desktop computers
Notebook computers
Smart battery packs
Industrial controllers
Telecom equipment
DESCRIPTION
The NE1618 is an accurate two-channel temperature monitor. It
measures the temperature of itself and the temperature of a remote
sensor. It can replace the NE1617 for a more precise measurement
to the remote temperature when it operates in extended mode. The
remote sensor is a diode connected transistor being in the form of
either a discrete NPN/PNP, such as the 2N3904/2N3906, or a diode
connected PNP built into another die, such as is done on some
INTEL microprocessors.
The temperature of both the remote and local sensors are stored in
the registers that can be read via a 2-wire SMBus. The data in the
temp reading registers are updated at the end of every data
conversion when the conversion is enable. At all time, data
conversion is initiated automatically in the rate defined by the
programmable data in the conversion rate register. However, a
conversion can be forced to occur immediately by a one-shot
programming.
The local temp is always measured with a resolution of 1.0
°C but
the remote temp can be measured in either one of two modes:
extended mode with a resolution of 0.125
°C and basic mode with a
resolution of 1.0
°C. The mode is set up automatically according to
the programmable data stored in the conversion rate register. (See
Table 6). Extended mode is set when the conversion rate is slow
(rate 0.7 Hz or less) and normal mode is set when the rate is high
(conversion rate of 2, 4, or 8 Hz).
There is also an alarm that senses either an over or under
temperature condition. The trip points for this alarm are also
programmable. The device can have 1 of 9 addresses (determined
by 2 address pins), so there can be up to 9 of the NE1618 on the
SMBus. It can also be put in a standby mode (in order to save
power). This can be done either with software (over the SMBus) or
with hardware (using the STBY pin).
PIN CONFIGURATION
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
TEST1
VDD
D+
D–
TEST5
ADD1
GND
GND
TEST16
STBY
SCLK
TEST13
SDATA
ALERT
ADD0
TEST9
SL01238
NE1618
Figure 1. Pin configuration
PIN DESCRIPTION
PIN #
FUNCTION
DESCRIPTION/COMMENTS
1
TEST1
Factory use only1
2
VDD
Positive supply2
3
D+
Positive side of remote sensor
4
D–
Negative side of remote sensor
5
TEST5
Factory use only1
6
ADD1
Device address pin (3-State)
7
GND
Ground
8
GND
Ground
9
TEST9
Factory use only1
10
ADD0
Device address pin (3-State)
11
ALERT
Open drain output used as
interrupt or SMBus alert
12
SDATA
SMBus serial data input/output
open drain
13
TEST13
Factory use only1
14
SCLK
SMBus clock input
15
STBY
Hardware standby input pin
HIGH = normal operating mode
LOW = standby mode
16
TEST16
Factory use only1
NOTES:
1. These pins should either floating or be tied to ground.
2. VDD pin should be decoupled by a 0.1 µF capacitor.
ORDERING INFORMATION
PART NUMBER
PACKAGE
DRAWING NUMBER
NE1618DS
16-lead QSOP package1
SOT519–1
NOTE:
1. Also called “SSOP16”.


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