EVALUATION KIT AVAILABLE
MAX1617A
Remote/Local Temperature Sensor
with SMBus Serial Interface
________________General Description
____________________________Features
The MAX1617A 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
two’s 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
The MAX1617A is nearly identical to the popular MAX1617,
but has improved SMBus timing specifications, improved
bus collision immunity, software manufacturer and device
identification available via the serial interface, and a poweron reset function that can force a reset of the slave address
via the serial interface.
________________________Applications
Desktop and Notebook
Computers
♦ SMBus 2-Wire Serial Interface
♦ Programmable Under/Overtemperature Alarms
♦ Supports SMBus Alert Response
♦ Supports Manufacturer and Device ID Codes
♦ 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
MAX1617AMEE+
TEMP. RANGE
-55°C to +125°C
PIN-PACKAGE
16 QSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
Central Office
Telecom Equipment
Smart Battery Packs
LAN Servers
Industrial Controls
♦ No Calibration Required
Test and Measurement
Multichip Modules
Typical Operating Circuit
___________________Pin Configuration
3V TO 5.5V
200Ω
0.1µF
TOP VIEW
+
N.C. 1
16 N.C.
VCC 2
15 STBY
MAX1617A
10k EACH
DXP
13 N.C.
11 ALERT
GND 7
10 ADD0
GND 8
9
SMBCLK
SMBDATA
12 SMBDATA
N.C. 5
ADD1 6
STBY
MAX1617A
14 SMBCLK
DXP 3
DXN 4
VCC
2N3904
DXN
2200pF
ALERT
CLOCK
DATA
INTERRUPT
TO µC
ADD0 ADD1 GND
N.C.
QSOP
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com
19-4508; Rev 1; 10/12
