NE1617A Datasheet, PDF (2/17 Pages) NXP Semiconductors – Temperature monitor for microprocessor systems

Philips Semiconductors
Temperature monitor for microprocessor systems
Product data sheet
NE1617A
FEATURES
• Replacement for Maxim MAX1617 and Analog Devices ADM1021
• Monitors local and remote temperature
• Accuracy
local (on-chip) sensor
remote sensor
60 °C to 100 °C
±2 °C
±3 °C
0 °C to 125 °C
±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
TEST1 1
V_DD 2
D+ 3
D– 4
TEST5 5
ADD1 6
GND 7
GND 8
16 TEST16
15 STBY
14 SCLK
13 TEST13
12 SDATA
11 ALERT
10 ADD0
9 TEST9
SL01202
Figure 1. Pin configuration.
PIN DESCRIPTION
PIN
SYMBOL
DESCRIPTION/COMMENTS
1
TEST1
Factory use only¹
2
V_DD
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 float or be tied to ground.
2. V_DD pin should be decoupled by a 0.1 µF capacitor.
2004 Oct 05
2