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MAX1618MUB

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
________________General Description
The MAX1618 precise digital thermometer reports the
temperature of a remote sensor. 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 MAX1618 can also measure the die temper-
ature 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 16Hz conversion
rate or programmed to operate in a single-shot mode.
The thermostat mode configures the ALERT output as an
interrupt or as a temperature reset that remains active only
while the temperature is above the maximum temperature
limit or below the minimum temperature limit. The ALERT
output polarity in thermostat mode can be configured for
active high or active low. Fan control is implemented using
this ALERT output.
The MAX1618 is available in a small (1.1mm high) 10-pin
µMAX package.
________________________Applications
Desktop and Notebook Central Office
Computers Telecom Equipment
Smart Battery Packs Test and Measurement
LAN Servers Multichip Modules
Industrial Controls
____________________________Features
♦ Single Channel: Measures Remote CPU
Temperature
♦ No Calibration Required
♦ SMBus 2-Wire Serial Interface
♦ Programmable Under/Overtemperature Alarms
♦ Overtemperature Output for Fan Control
(Thermostat Mode)
♦ Supports SMBus Alert Response Accuracy
±3°C (+60°C to +100°C)
±5°C (-55°C to +120°C)
♦ 3µA (typ) Standby Supply Current
♦ 900µA (max) Supply Current in Autoconvert Mode
♦ +3V to +5.5V Supply Range
♦ Small 10-Pin µMAX Package
MAX1618
†
Remote Temperature Sensor
with SMBus Serial Interface
________________________________________________________________ Maxim Integrated Products 1
MAX1618
SMBCLK
ADD0 ADD1
V
CC
STBY
GND
ALERT
SMBDATA
DXP
DXN
INTERRUPT
TO µC
3V TO 5.5V
200Ω
0.1µF
CLOCK
10k EACH
DATA
2N3904
2200pF
___________________Pin Configuration
1
2
3
4
5
10
9
8
7
6
ALERT
SMBDATA
SMBCLK
STBYDXN
GND
ADD1
ADD0
MAX1618
µMAX
TOP VIEW
V
CC
DXP
Typical Operating Circuit
19-1495; Rev 1; 12/99
PART
MAX1618MUB -55°C to +125°C
TEMP. RANGE PIN-PACKAGE
10 µMAX
Ordering Information
SMBus is a trademark of Intel Corp.
†Patents Pending
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Autoconvert
mode, average
MAX1618
Remote Temperature Sensor
with SMBus Serial Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V, configuration byte register = X8h, T
A
= 0°C to +85°C, unless otherwise noted.)
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.
V
CC
to GND..............................................................-0.3V to +6V
DXP, ADD_ to GND ....................................-0.3V to (V
CC
+ 0.3V)
DXN to GND ..........................................................-0.3V to +0.8V
SMBCLK, SMBDATA, ALERT, STBY to GND ...........-0.3V to +6V
SMBDATA Current.................................................-1mA to 50mA
DXN Current. ......................................................................±1mA
ESD Protection (all pins, Human Body Model).. .............± 2000V
Continuous Power Dissipation (T
A
= +70°C)
µMAX (derate 5.6mW/°C above +70°C) ....................444mW
Operating Temperature Range (extended)......-55°C to +125°C
Junction Temperature.....................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................+300°C
CONDITIONSSYMBOL UNITSMIN TYP MAXPARAMETER
Monotonicity guaranteed Bits
8
Temperature Resolution
(Note 1)
V
CC
V
3 5.5
Supply-Voltage Range
T
R
= +60°C to +100°C
°C
-3 3
Temperature Error,
Remote Diode (Note 2)
mV
50
Undervoltage Lockout Hysteresis
V
CC
input, disables A/D conversion,
rising edge
mV
50
POR Threshold Hysteresis
V
CC
, falling edge V
1 1.7 2.5
Power-On Reset Threshold
UVLO V
2.6 2.8 2.95
Undervoltage Lockout
Threshold
Hardware or software standby,
SMBCLK at 10kHz
µA
5
Standby Supply Current
From stop bit to conversion complete
SMBus static
t
CONV
ms
47 62 78
Conversion Time
µA
450 900
Average Operating
Supply Current
µA
80 100 120
Remote-Diode Source Current
Autoconvert mode
V
0.7
DXN Source Voltage
81012
%
-25 25
Conversion Rate Timing Error
µA
310
Standby Supply Current
V
CC
= 3.0V to 5.5V
Momentary upon power-on reset
V
IL
V
0.8
STBY,
SMBCLK, SMBDATA
Input Low Voltage
V
CC
= 3.0V V
IH
V
2.2
STBY SMBCLK, SMBDATA
Input High Voltage
SMBCLK, SMBDATA forced to 0.4V mA
6
SMBCLK, SMBDATA
Output Low Sink Current
Logic inputs forced to V
CC
or GND µA
-1 1
STBY,
SMBCLK, SMBDATA
Input Current
µA
160
ADDO, ADD1 Bias Current
T
R
= +55°C to +125°C
-5 5
Autoconvert mode, average measured over
4sec, 16 conv/sec
DXP forced to DXN + 0.65V,
ID = 1 (high)
High level
Low level
SMBus INTERFACE
ADC AND POWER SUPPLY
MAX1618
Remote Temperature Sensor
with SMBus Serial Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.3V, configuration byte register = X8h, T
A
= 0°C to +85°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.3V, configuration byte register = X8h, T
A
= -55°C to +125°C, unless otherwise noted.) (Note 5)
CONDITIONS
Monotonicity guaranteed
T
R
= +60°C to +100°C
Bits8Temperature Resolution (Note 1)
-3 3
T
R
= -55°C to +125°C
°C
-5 5
Initial Temperature Error,
Remote Diode (Note 2)
V3 5.5Supply-Voltage Range
From stop bit to conversion complete
Autoconvert mode
ms47 62 78Conversion Time
%-25 25Conversion-Rate Timing Error
UNITSMIN TYP MAXPARAMETER
CONDITIONSSYMBOL
ALERT forced to 5.5V
µA
1
ALERT Output High
Leakage Current
ALERT forced to 0.4V
mA
6
ALERT Output Low Sink Current
UNITSMIN TYP MAXPARAMETER
(Note 3) kHz
DC 100
SMBus Clock Frequency
90% to 90% points t
HIGH
µs
4
SMBCLK Clock High Time
10% to 10% points t
LOW
µs4.7SMBCLK Clock Low Time
90% to 10% pointst
F
ns
300
SMBCLK, SMBDATA Fall Time
90% to 90% points
10% to 90% points
t
SU:STA
ns
500
SMBus Repeated Start
Condition Setup Time
µs
4.7
SMBus Start Condition
Setup Time
t
R
µs
1
SMBCLK, SMBDATA Rise Time
pF
5
SMBCLK, SMBDATA Input
Capacitance
90% of SMBCLK to 10% of SMBDATAt
SU:STO
µs
4
SMBus Stop Condition
Setup Time
(Note 4)
10% of SMBDATA to 90% of SMBCLK
t
HD:DAT
µs
0
SMBus Data-Hold Time
90% of SMBDATA to 10% of SMBCLKt
SU:DAT
ns
250
SMBus Data Valid to SMBCLK
Rising-Edge Time
t
HD:STA
µs
4
SMBus Start Condition
Hold Time
Master clocking in data µs
1
SMBCLK Falling Edge to SMBus
Data-Valid Time
Between start/stop condition t
BUF
µs
4.7
SMBus Bus Free Time
V
CC
t
CONV
SYMBOL
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX1618MUB

Mfr. #:
Buy MAX1618MUB
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors Remote Temperature Sensor with SMBus Serial Interface
Lifecycle:
New from this manufacturer.
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