Remote/Local Temperature Sensor
with SMBus Serial Interface
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com
MAX1617
________________General Description
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
transistortypically a low-cost, easily mounted 2N3904
NPN typethat replaces conventional thermistors or
thermocouples. Remote accuracy is ?癈 for multiple
transistor manufacturers, with no calibration needed.
The remote channel can also measure the die tempera-
ture 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 for-
mat is 7 bits plus sign, with each bit corresponding to
1癈, in twos-complement format. Measurements can be
done automatically and autonomously, with the conver-
sion 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.
The MAX1617 is available in a small, 16-pin QSOP sur-
face-mount package.
________________________Applications
Desktop and Notebook
Central Office
Computers
Telecom Equipment
Smart Battery Packs
Test and Measurement
LAN Servers
Multi-Chip Modules
Industrial Controls
____________________________Features
f Two Channels: Measures Both Remote and Local
Temperatures
f No Calibration Required
f SMBus 2-Wire Serial Interface
f Programmable Under/Overtemperature Alarms
f Supports SMBus Alert Response
f Accuracy:
?癈 (+60癈 to +100癈, local)
?癈 (-40癈 to +125癈, local)
?癈 (+60癈 to +100癈, remote)
f 3?/SPAN>A (typ) Standby Supply Current
f 70?/SPAN>A (max) Supply Current in Auto-Convert Mode
f +3V to +5.5V Supply Range
f Small, 16-Pin QSOP Package
MAX1617
SMBCLK
ADD0 ADD1
V
CC
STBY
GND
ALERT
SMBDATA
DXP
DXN
INTERRUPT
TO 糃
3V TO 5.5V
200?/DIV>
0.1糉
CLOCK
10k EACH
DATA
2N3904
2200pF
___________________Pin Configuration
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
N.C.
N.C.
STBY
SMBCLK
N.C.
SMBDATA
ALERT
ADD0
N.C.
TOP VIEW
MAX1617
QSOP
V
CC
DXP
ADD1
DXN
N.C.
GND
GND
+
__________Typical Operating Circuit
19-1265; Rev 2; 11/12
PART
MAX1617MEE+
-55癈 to +125癈
TEMP. RANGE
PIN-PACKAGE
16 QSOP
_______________Ordering Information
+Denotes a lead(Pb)-free/RoHS-compliant package.
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