MAX1617_12 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Remote/Local Temperature Sensor with SMBus Serial Interface

MAX1617
Remote/Local Temperature Sensor
with SMBus Serial Interface
________________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
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 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°C, 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
Computers
Central Office
Telecom Equipment
Smart Battery Packs
Test and Measurement
LAN Servers
Multi-Chip Modules
Industrial Controls
___________________Pin Configuration
____________________________Features
♦ 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
_______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX1617MEE+ -55°C to +125°C 16 QSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
__________Typical Operating Circuit
TOP VIEW
+
N.C. 1
V_CC 2
DXP 3
DXN 4
MAX1617
N.C. 5
ADD1 6
GND 7
GND 8
QSOP
16 N.C.
15 STBY
14 SMBCLK
13 N.C.
12 SMBDATA
11 ALERT
10 ADD0
9 N.C.
2N3904
0.1µF
3V TO 5.5V
200Ω
V_CC STBY
MAX1617
DXP
SMBCLK
SMBDATA
DXN
2200pF
ALERT
ADD0 ADD1 GND
10k EACH
CLOCK
DATA
INTERRUPT
TO µC
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com
19-1265; Rev 2; 11/12