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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1619 Datasheet

Remote/Local Temperature Sensor with Dual- Alarm Outputs and SMBus Serial Interface

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19-1483; Rev 0; 4/99
Remote/Local Temperature Sensor with Dual-
Alarm Outputs and SMBus Serial Interface
________________General Description
The MAX1619 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 transis-
tor—typically a low-cost, easily mounted 2N3904 NPN
type—that replaces conventional thermistors or thermo-
couples. 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.
The MAX1619 is nearly identical to the popular MAX1617A,
with the additional feature of an overtemperature alarm out-
put (OVERT) that responds to the remote temperature; this
is optimal for fan control.
________________________Applications
Desktop and Notebook
Computers
Central Office
Telecom Equipment
Smart Battery Packs
Test and Measurement
LAN Servers
Multichip Modules
Industrial Controls
___________________Pin Configuration
____________________________Features
o Two Channels Measure Both Remote and Local
Temperatures
o No Calibration Required
o SMBus 2-Wire Serial Interface
o Programmable Under/Overtemperature Alarms
o OVERT Output for Fan Control
o Supports SMBus Alert Response
o Supports Manufacturer and Device ID Codes
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 Write-Once Protection
o Small 16-Pin QSOP Package
Ordering Information
PART
MAX1619MEE
TEMP. RANGE
-55°C to +125°C
PIN-PACKAGE
16 QSOP
Typical Operating Circuit
0.1µF
+3V TO +5.5V
200
TOP VIEW
VCC 1
GND 2
DXP 3
DXN 4
N.C. 5
ADD1 6
GND 7
GND 8
MAX1619
16 N.C.
15 STBY
14 SMBCLK
13 N.C.
12 SMBDATA
11 ALERT
10 ADD0
9 OVERT
QSOP
SMBus is a registered trademark of Intel Corp.
2N3904
VCC STBY
MAX1619
DXP SMBCLK
DXN
2200pF
SMBDATA
ALERT
OVERT
ADD0 ADD1 GND
10k EACH
CLOCK
DATA
INTERRUPT
TO µC
FAN
CONTROL
________________________________________________________________ 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

MAX1619 Datasheet

Remote/Local Temperature Sensor with Dual- Alarm Outputs and SMBus Serial Interface

No Preview Available !

Remote/Local Temperature Sensor with Dual-
Alarm Outputs and 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, OVERT,
STBY to GND............................................................-0.3V to +6V
SMBDATA, ALERT, OVERT Current....................-1mA to +50mA
DXN Current .......................................................................±1mA
ESD Protection (all 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 +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, TA = 0°C to +85°C, configuration byte = XCh, 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, 3)
Temperature Error, Local Diode
(Notes 1, 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 (Note 4)
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,
SMBCLK at 10kHz
3 10
µA
5
Average Operating Supply Current
Autoconvert 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 MAX1619
Description Remote/Local Temperature Sensor with Dual- Alarm Outputs and SMBus Serial Interface
Maker Maxim
Total Page 20 Pages
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