19-1265; Rev 1; 3/98
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Remote/Local Temperature Sensor
with SMBus Serial Interface
____________________________Features
The MAX1617 is a precise digital thermometer that
reports the temperature of both a remote sensor and its
own package. The remote sensor is a diode-connected
transistor—typically a low-cost, easily mounted 2N3904
NPN type—that replaces conventional thermistors or
thermocouples. Remote accuracy is ±3°C for multiple
transistor manufacturers, with no calibration needed.
The remote channel can also measure the die temperature of other ICs, such as microprocessors, that contain
an on-chip, diode-connected transistor.
The 2-wire serial interface accepts standard System
Management Bus (SMBus™) Write Byte, Read Byte,
Send Byte, and Receive Byte commands to program the
alarm thresholds and to read temperature data. The data
format is 7 bits plus sign, with each bit corresponding to
1°C, in twos-complement format. Measurements can be
done automatically and autonomously, with the conversion rate programmed by the user or programmed to
operate in a single-shot mode. The adjustable rate allows
the user to control the supply-current drain.
♦ Two Channels: Measures Both Remote and Local
Temperatures
♦ No Calibration Required
♦ SMBus 2-Wire Serial Interface
♦ Programmable Under/Overtemperature Alarms
♦ Supports SMBus Alert Response
♦ Accuracy:
±2°C (+60°C to +100°C, local)
±3°C (-40°C to +125°C, local)
±3°C (+60°C to +100°C, remote)
♦ 3µA (typ) Standby Supply Current
♦ 70µA (max) Supply Current in Auto-Convert Mode
♦ +3V to +5.5V Supply Range
♦ Small, 16-Pin QSOP Package
The MAX1617 is available in a small, 16-pin QSOP surface-mount package.
_______________Ordering Information
________________________Applications
Desktop and Notebook
Computers
Central Office
Telecom Equipment
Smart Battery Packs
LAN Servers
PART
MAX1617MEE
TEMP. RANGE
-55°C to +125°C
PIN-PACKAGE
16 QSOP
Test and Measurement
Multi-Chip Modules
Industrial Controls
___________________Pin Configuration
__________Typical Operating Circuit
3V TO 5.5V
200Ω
0.1µF
TOP VIEW
N.C. 1
16 N.C.
VCC 2
15 STBY
DXP 3
14 SMBCLK
DXN 4
VCC
STBY
10k EACH
MAX1617
MAX1617
DXP
13 N.C.
12 SMBDATA
N.C. 5
ADD1 6
10 ADD0
GND 8
9
SMBDATA
11 ALERT
GND 7
2N3904
N.C.
SMBCLK
DXN
2200pF
ALERT
CLOCK
DATA
INTERRUPT
TO µC
ADD0 ADD1 GND
QSOP
SMBus is a trademark of Intel Corp.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
MAX1617
________________General Description
