Philips Semiconductors
Product specification
NE1617
Temperature monitor for microprocessor systems
2
1999 Mar 19
8532144 21065
FEATURES
Replacement for Maxim MAX1617 and Analog Devices ADM1021
Monitors local and remote temperature
Accuracy
2
C local (on-chip) sensor
3
C remote sensor
No calibration required
Programmable over/under temperature alarm
SMBus 2-wire serial interface
3V to 5.5V supply range
70
a supply current in operating mode
3
a (typical) supply current in standby mode
Small 16lead QSOP package
APPLICATIONS
Desktop computers
Notebook computers
Smart battery packs
Industrial controllers
Telecom equipment
DESCRIPTION
The NE1617 is an accurate two-channel temperature monitor. It
measures the temperature of itself and the temperature of a remote
sensor. The remote sensor is a diode connected transistor. This can
be 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 is stored in a
register that can be read via a 2-wire SMBus. The temperatures are
updated at a rate that is programmable via the SMBus (the average
supply current is dependent upon the update rate--the faster the
rate, the higher the current).
In addition to the normal operation, which is to update the
temperature at the programmed rate, there is a one shot mode that
will force a temperature update.
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 NE1617 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 STANDBY pin).
PIN CONFIGURATION
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
TEST
V
DD
D+
D
TEST
ADD1
GND
GND
TEST
STBY
SCLK
TEST
SDATA
ALERT
ADD0
TEST
SL01202
Figure 1. Pin configuration
PIN FUNCTION DESCRIPTION
PIN #
FUNCTION
DESCRIPTION/COMMENTS
1
TEST
Factory use only
1
2
V
DD
Positive supply
2
3
D+
Positive side of remote sensor
4
D
Negative side of remote sensor
5
TEST
Factory use only
1
6
ADD1
Device address pin (3-State)
7
GND
Ground
8
GND
Ground
9
TEST
Factory use only
1
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
TEST
Factory use only
1
14
SCLK
SMBus clock input
15
STBY
Hardware standby input pin
HIGH = normal operating mode
LOW = standby mode
16
TEST
Factory use only
1
NOTES:
1. These pins should either float or be tied to ground.
2. V
DD
pin should be decoupled by a 0.1
F capacitor.
ORDERING INFORMATION
PART NUMBER
PACKAGE
DRAWING NUMBER
NE1617DS
16-lead QSOP package
SOT5191
Philips Semiconductors
Product specification
NE1617
Temperature monitor for microprocessor systems
1999 Mar 19
4
TYPICAL OPERATING CIRCUIT
2
15
14
12
11
10
6
7
8
SHIELDED
TWISTED PAIR
(NOTE 1)
REMOTE SENSOR
3
4
C
1
(NOTE 2)
0.1
F
V
DD
CLOCK
DATA
MICROCONTROLLER
INTERRUPT
10K
10K
10K
SL01203
NE1617
NOTES:
1. May be required if remote diode is in a noisy environment and/or several feet from the NE1617.
2. May be required in noisy environment. Up to 2200pF may be used.
Figure 2. Typical operating circuit
ABSOLUTE MAXIMUM RATINGS
PARAMETER
MIN.
MAX.
UNIT
V
DD
to GND
0.3
+6
V
D+, ADD0, ADD1
0.3
V
DD
+0.3
V
D to GND
0.3
+0.8
V
SCLK, SDATA, ALERT, STBY
0.3
+6
V
Input current SDATA
1
+50
mA
D current
1
mA
Operating temperature range
0
+120
C
Maximum junction temperature
+150
C
Storage temperature range
65
+150
C
Philips Semiconductors
Product specification
NE1617
Temperature monitor for microprocessor systems
1999 Mar 19
5
ELECTRICAL CHARACTERISTICS
V
DD
= 3.3V; T
amb
= 0
C to +125
C unless otherwise noted.
PARAMETER
CONDITIONS
LIMITS
UNIT
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Temperature resolution
1
C
Local temperature error
T
amb
= +60
C to +100
C
<
1
2
C
Local temperature error
T
amb
= 0
C to +125
C
<
2
3
C
Remote temperature error
T
remote
= +60
C to +100
C
3
C
Remote temperature error
T
remote
= 0
C to +125
C
5
C
Under voltage lockout
V
DD
supply (Note 1)
2.0
2.95
V
Power-on reset threshold
V
DD
supply (falling edge) (Note 2)
1.0
2.5
V
Power supply current (average)
Conversion rate = 0.25/sec
70
A
Power supply current (average)
Conversion rate = 2/sec
180
A
Power supply current (standby)
SMBus inactive
3
10
A
Conversion time
From stop bit to conversion complete,
both channels
170
ms
Conversion rate error
Percentage error in programmed rate
30
+30
%
Remote sensor source current
HIGH level
100
A
Remote sensor source current
LOW level
10
A
Address pin bias current
Momentary as the address is being read
(Notes 3 and 4)
160
A
NOTES:
1. V
DD
(rising edge) voltage below which the ADC is disabled.
2. V
DD
(falling edge) voltage below which the logic is reset.
3. Address is read a power up and at start of conversion for all conversions except the fastest rate.
4. Due to the bias current, any pull-up/down resistors should be
2k
.
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