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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1618 Datasheet

Remote Temperature Sensor with SMBus Serial Interface

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MAX1618 pdf
19-1495; Rev 1; 10/99
Remote Temperature Sensor
with SMBus Serial Interface
________________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
Computers
Central Office
Telecom Equipment
Smart Battery Packs
Test and Measurement
LAN Servers
Multichip Modules
Industrial Controls
___________________Pin Configuration
TOP VIEW
ADD0 1
ADD1 2
GND 3
DXN 4
DXP 5
MAX1618
µMAX
10 ALERT
9 SMBDATA
8 SMBCLK
7 STBY
6 VCC
____________________________Features
o Single Channel: Measures Remote CPU
Temperature
o No Calibration Required
o SMBus 2-Wire Serial Interface
o Programmable Under/Overtemperature Alarms
o Overtemperature Output for Fan Control
(Thermostat Mode)
o Supports SMBus Alert Response Accuracy
±3°C (+60°C to +100°C)
±5°C (-55°C to +120°C)
o 3µA (typ) Standby Supply Current
o 900µA (max) Supply Current in Autoconvert Mode
o +3V to +5.5V Supply Range
o Small 10-Pin µMAX Package
PART
MAX1618MUB
Ordering Information
TEMP. RANGE
-55°C to +125°C
PIN-PACKAGE
10 µMAX
2N3904
Typical Operating Circuit
0.1µF
3V TO 5.5V
200
VCC STBY
MAX1618
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 1-800-835-8769.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1618 Datasheet

Remote Temperature Sensor with SMBus Serial Interface

No Preview Available !

MAX1618 pdf
Remote 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 Current.................................................-1mA to 50mA
DXN Current. ......................................................................±1mA
ESD Protection (all pins, Human Body Model).. .............± 2000V
Continuous Power Dissipation (TA = +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, 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, configuration byte register = X8h, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
ADC AND POWER SUPPLY
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Temperature Resolution
(Note 1)
Temperature Error,
Remote Diode (Note 2)
Supply-Voltage Range
Undervoltage Lockout
Threshold
VCC
UVLO
Monotonicity guaranteed
TR = +60°C to +100°C
TR = +55°C to +125°C
VCC input, disables A/D conversion,
rising edge
8 Bits
-3 3
°C
-5 5
3 5.5 V
2.6 2.8 2.95 V
Undervoltage Lockout Hysteresis
Power-On Reset Threshold
POR Threshold Hysteresis
Standby Supply Current
VCC, falling edge
SMBus static
50 mV
1 1.7 2.5 V
50 mV
3 10 µA
Standby Supply Current
Hardware or software standby,
SMBCLK at 10kHz
5 µA
Average Operating
Supply Current
Autoconvert mode, average meAaustoucreodnvoevret r
4sec, 16 conv/sec
mode, average
450 900 µA
Conversion Time
Conversion Rate Timing Error
tCONV
From stop bit to conversion complete
Autoconvert mode
47 62
-25
78 ms
25 %
Remote-Diode Source Current
DXP forced to DXN + 0.65V,
ID = 1 (high)
High level
Low level
80
8
100 120
10 12
µA
DXN Source Voltage
0.7 V
ADDO, ADD1 Bias Current
Momentary upon power-on reset
160 µA
SMBus INTERFACE
STBY SMBCLK, SMBDATA
Input High Voltage
VIH VCC = 3.0V
2.2 V
STBY, SMBCLK, SMBDATA
Input Low Voltage
VIL VCC = 3.0V to 5.5V
0.8 V
STBY, SMBCLK, SMBDATA
Input Current
Logic inputs forced to VCC or GND
-1
1 µA
SMBCLK, SMBDATA
Output Low Sink Current
SMBCLK, SMBDATA forced to 0.4V
6
mA
2 _______________________________________________________________________________________


Part Number MAX1618
Description Remote Temperature Sensor with SMBus Serial Interface
Maker Maxim
Total Page 20 Pages
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