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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1668 Datasheet

Multichannel Remote/Local Temperature Sensors

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MAX1668 pdf
19-1766; Rev 2; 5/03
Multichannel Remote/Local
Temperature Sensors
________________General Description
The MAX1668/MAX1805/MAX1989 are precise multi-
channel digital thermometers that report the tempera-
ture of all remote sensors and their own packages. The
remote sensors are diode-connected transistors—typi-
cally low-cost, easily mounted 2N3904 NPN types—that
replace conventional thermistors or thermocouples.
Remote accuracy is ±3°C for multiple transistor manu-
facturers, with no calibration needed. The remote chan-
nels 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 for-
mat is 7 bits plus sign, with each bit corresponding to
1°C, in two’s-complement format.
The MAX1668/MAX1805/MAX1989 are available in
small, 16-pin QSOP surface-mount packages. The
MAX1989 is also available in a 16-pin TSSOP.
________________________Applications
Desktop and Notebook
Computers
Central-Office Telecom
Equipment
LAN Servers
Test and Measurement
Industrial Controls
Multichip Modules
____________________________Features
o Multichannel
4 Remote, 1 Local (MAX1668/MAX1989)
2 Remote, 1 Local (MAX1805)
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 700µA (max) Supply Current
o Small, 16-Pin QSOP/TSSOP Packages
_______________Ordering Information
PART
MAX1668MEE
MAX1805MEE
MAX1989MEE
MAX1989MUE
TEMP RANGE
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
16 QSOP
16 QSOP
16 QSOP
16 TSSOP
Pin Configuration
TOP VIEW
DXP1 1
DXN1 2
DXP2 3
DXN2 4
(N.C.) DXP3 5
(N.C.) DXN3 6
(N.C.) DXP4 7
(N.C.) DXN4 8
MAX1668
MAX1805
MAX1989
16 GND
15 STBY
14 SMBCLK
13 SMBDATA
12 ALERT
11 ADD0
10 ADD1
9 VCC
( ) ARE FOR MAX1805.
QSOP/TSSOP
Typical Operating Circuit
0.1µF
3V TO 5.5V
200
2200pF
*
2200pF
*
VCC STBY
MAX1668
MAX1805
MAX1989
DXP1
SMBCLK
DXN1
SMBDATA
ALERT
DXP4
DXN4
ADD0 ADD1 GND
10kEACH
CLOCK
DATA
INTERRUPT
TO µC
* DIODE-CONNECTED TRANSISTOR
SMBus is a trademark of Intel Corp.
Patents Pending
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1668 Datasheet

Multichannel Remote/Local Temperature Sensors

No Preview Available !

MAX1668 pdf
Multichannel Remote/Local
Temperature Sensors
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V
DXP_, ADD_, STBY to GND........................-0.3V to (VCC + 0.3V)
DXN_ to GND ........................................................-0.3V to +0.8V
SMBCLK, SMBDATA, ALERT to GND ......................-0.3V to +6V
SMBDATA, ALERT Current .................................-1mA to +50mA
DXN_ Current......................................................................±1mA
Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.30mW/°C above +70°C) ....................667mW
TSSOP (derate 9.40mW/°C above +70°C) ..................755mW
Operating Temperature Range .........................-55°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+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, STBY = VCC, configuration byte = X0XXXX00, TA = 0°C to +125°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP
ADC AND POWER SUPPLY
Temperature Resolution (Note 1) Monotonicity guaranteed
8
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 +125°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
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
VCC input, disables A/D conversion, rising edge
2.60 2.8
50
Power-On Reset (POR) Threshold
POR Threshold Hysteresis
VCC, falling edge
1.3 1.8
50
Standby Supply Current
Average Operating Supply Current
Conversion Time
Remote-Diode Source Current
DXN_ Source Voltage
Address Pin Bias Current
Logic inputs
forced to VCC
or GND
SMBus static
Hardware or software standby,
SMBCLK at 10kHz
Average measured over 4s; logic inputs forced
VCC or GND
From stop bit to conversion complete (all channels)
High level (POR state)
Low level (POR state)
DXP_ forced to 1.5V
Configuration byte =
X0XXXX10, high level
Configuration byte =
X0XXXX01, high level
ADD0, ADD1; momentary upon power-on reset
260
70
7
3
5
400
320
100
10
200
50
0.7
160
MAX UNITS
+2
+3
+3
+5
+2.5
+3.5
5.5
2.95
2.3
10
12
Bits
°C
°C
°C
V
V
mV
V
mV
µA
700 µA
380 ms
130
13
µA
V
µA
2 _______________________________________________________________________________________


Part Number MAX1668
Description Multichannel Remote/Local Temperature Sensors
Maker Maxim
Total Page 17 Pages
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