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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1617 Datasheet

Remote/Local Temperature Sensor with SMBus Serial Interface

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19-1265; Rev 1; 3/98
EVAALVUAAILTAIOBNLEKIT
Remote/Local Temperature Sensor
with SMBus Serial Interface
________________General Description
The MAX1617 (patents pending) 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 con-
ventional thermistors or thermocouples. Remote accu-
racy 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-con-
nected 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 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
o Two Channels: Measures Both Remote and Local
Temperatures
o No Calibration Required
o SMBus 2-Wire Serial Interface
o Programmable Under/Overtemperature Alarms
o Supports SMBus Alert Response
o 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)
o 3µA (typ) Standby Supply Current
o 70µA (max) Supply Current in Auto-Convert Mode
o +3V to +5.5V Supply Range
o Small, 16-Pin QSOP Package
_______________Ordering Information
PART*
MAX1617MEE
TEMP. RANGE
-55°C to +125°C
*U.S. and foreign patents pending.
PIN-PACKAGE
16 QSOP
__________Typical Operating Circuit
TOP VIEW
N.C. 1
VCC 2
DXP 3
DXN 4
N.C. 5
ADD1 6
GND 7
GND 8
MAX1617
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
200
VCC STBY
MAX1617
DXP SMBCLK
SMBDATA
DXN
2200pF
ALERT
ADD0 ADD1 GND
10k EACH
CLOCK
DATA
INTERRUPT
TO µC
SMBus is a trademark of Intel Corp.
Patents Pending
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1617 Datasheet

Remote/Local Temperature Sensor with SMBus Serial Interface

No Preview Available !

Remote/Local Temperature Sensor
with SMBus Serial Interface
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V
DXP, ADD_ to GND ....................................-0.3V to (VCC + 0.3V)
DXN to GND ..........................................................-0.3V to +0.8V
SMBCLK, SMBDATA, ALERT, STBY to GND ...........-0.3V to +6V
SMBDATA, ALERT Current .................................-1mA to +50mA
DXN Current .......................................................................±1mA
ESD Protection (SMBCLK, SMBDATA,
ALERT, human body model) .......................................... 4000V
ESD Protection (other pins, human body model)...............2000V
Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.30mW/°C above +70°C) .....................667mW
Operating Temperature Range .........................-55°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = +3.3V, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
ADC AND POWER SUPPLY
Temperature Resolution (Note 1) Monotonicity guaranteed
8 Bits
Initial Temperature Error,
Local Diode (Note 2)
Temperature Error, Remote Diode
(Notes 2 and 3)
Temperature Error, Local Diode
(Notes 1 and 2)
Supply-Voltage Range
TA = +60°C to +100°C
TA = 0°C to +85°C
TR = +60°C to +100°C
TR = -55°C to +125°C
Including long-term drift
TA = +60°C to +100°C
TA = 0°C to +85°C
-2
-3
-3
-5
-2.5
-3.5
3.0
2
°C
3
3
°C
5
2.5
°C
3.5
5.5 V
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
VCC input, disables A/D conversion, rising edge
2.60 2.80 2.95
V
50 mV
Power-On Reset Threshold
POR Threshold Hysteresis
VCC, falling edge
1.0 1.7 2.5
V
50 mV
Standby Supply Current
Logic inputs
forced to VCC
or GND
SMBus static
Hardware or software standby, SMB-
CLK at 10kHz
3 10
µA
4
Average Operating Supply Current
Auto-convert mode, average 0.25 conv/sec
measured over 4sec. Logic
inputs forced to VCC or GND. 2.0 conv/sec
35 70
µA
120 180
Conversion Time
Conversion Rate Timing Error
Remote-Diode Source Current
DXN Source Voltage
Address Pin Bias Current
From stop bit to conversion complete (both channels) 94 125 156 ms
Auto-convert mode
-25 25 %
DXP forced to 1.5V
High level
Low level
80 100 120
µA
8 10 12
0.7 V
ADD0, ADD1; momentary upon power-on reset
160 µA
2 _______________________________________________________________________________________


Part Number MAX1617
Description Remote/Local Temperature Sensor with SMBus Serial Interface
Maker Maxim
Total Page 20 Pages
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