ne1618 NXP Semiconductors, ne1618 Datasheet - Page 2

• Manufacturer Part Number: ne1618
• Description: Temperature Monitor For Microprocessor Systems
• Manufacturer: NXP Semiconductors

1. Also called “SSOP16”.
Philips Semiconductors
FEATURES
APPLICATIONS
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
ORDERING INFORMATION
NOTE:
2002 Jan 04
Monitors local and remote temperature
Accuracy
–
–
–
No calibration required
Programmable over/under temperature alarm
SMBus 2-wire serial interface
3 V to 3.6 V supply range
80 A supply current in operating mode
3 A (typical) supply current in standby mode
Small 16-lead QSOP package
Desktop computers
Notebook computers
Smart battery packs
Industrial controllers
Telecom equipment
Temperature monitor for microprocessor systems
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
PART NUMBER
NE1618DS
16-lead QSOP package
PACKAGE
2
1. These pins should either floating or be tied to ground.
2. V
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
PIN DESCRIPTION
NOTES:
PIN #
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
DD
1
pin should be decoupled by a 0.1 F capacitor.
FUNCTION
TEST13
TEST16
TEST1
TEST5
TEST9
ALERT
SDATA
ADD1
ADD0
SCLK
STBY
GND
GND
V
TEST1
TEST5
D+
D–
ADD1
Figure 1. Pin configuration
DD
GND
GND
V
D+
D–
DD
1
2
3
4
5
6
7
8
NE1618
Factory use only
Positive supply
Positive side of remote sensor
Negative side of remote sensor
Factory use only
Device address pin (3-State)
Ground
Ground
Factory use only
Device address pin (3-State)
Open drain output used as
interrupt or SMBus alert
SMBus serial data input/output
open drain
Factory use only
SMBus clock input
Hardware standby input pin
Factory use only
DESCRIPTION/COMMENTS
HIGH = normal operating mode
LOW = standby mode
SL01238
DRAWING NUMBER
16
15
14
13
12
11
10
9
TEST16
STBY
SCLK
TEST13
SDATA
ALERT
ADD0
TEST9
SOT519–1
2
1
1
1
1
1
853–2299 27510
NE1618
Product data