Philips Semiconductors Product data sheet
NE1617ATemperature monitor for microprocessor systems
2
2004 Oct 05
FEATURES
• Replacement for Maxim MAX1617 and Analog Devices ADM1021
• Monitors local and remote temperature
• Accuracy
60 °C to 100 °C 0 °C to 125 °C
local (on-chip) sensor ±2 °C ±3 °C
remote sensor ±3 °C ±5 °C
• No calibration required
• Programmable over/under temperature alarm
• SMBus 2-wire serial interface up to 100 kHz
• 3 V to 5.5 V supply range; 5.5 V tolerant
• 70 µA supply current in operating mode
• 3 µA (typical) supply current in standby mode
• ESD protection exceeds 2000 V HBM per JESD22-A114,
250 V MM per JESD22-A115, and 1000 V CDM per
JESD22-C101
• Latch–up testing is done to JEDEC standard JESD78, which
exceeds 100 mA
• Small 16-lead SSOP (QSOP) package
APPLICATIONS
• Desktop computers
• Notebook computers
• Smart battery packs
• Industrial controllers
• Telecom equipment
DESCRIPTION
The NE1617A 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 NE1617A 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
161
2
3
4
5
6
7
8
TEST1
V
DD
D+
D–
TEST5
ADD1
GND
GND
TEST16
STBY
SCLK
TEST13
SDATA
ALERT
ADD0
TEST9
SL01202
Figure 1. Pin configuration.
PIN DESCRIPTION
PIN SYMBOL DESCRIPTION/COMMENTS
1 TEST1 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 TEST5 Factory use only
1
6 ADD1 Device address pin (3-State)
7 GND Ground
8 GND Ground
9 TEST9 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 TEST13 Factory use only
1
14 SCLK SMBus clock input
15 STBY Hardware standby input pin
HIGH = normal operating mode
LOW = standby mode
16 TEST16 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 µF capacitor.
