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MAX1805 Datasheet

  • MAX1805

  • Multichannel Remote/Local Temperature Sensors

  • Maxim   Maxim

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19-1766; Rev 1; 8/02
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鈥攖ypi-
cally low-cost, easily mounted 2N3904 NPN types鈥攖hat
replace conventional thermistors or thermocouples.
Remote accuracy is 鹵3擄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鈩? 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擄C, in two鈥檚-complement format.
The MAX1668/MAX1805/MAX1989 are available in
small, 16-pin QSOP surface-mount packages.
____________________________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
鹵2擄C (+60擄C to +100擄C, Local)
鹵3擄C (-40擄C to +125擄C, Local)
鹵3擄C (+60擄C to +100擄C, Remote)
o
3碌A(chǔ) (typ) Standby Supply Current
o
700碌A(chǔ) (max) Supply Current
o
Small, 16-Pin QSOP Package
MAX1668/MAX1805/MAX1989
鈥?/div>
________________________Applications
Desktop and Notebook
Computers
LAN Servers
Industrial Controls
Central-Office Telecom
Equipment
Test and Measurement
Multichip Modules
_______________Ordering Information
PART
MAX1668MEE
MAX1805MEE
MAX1989MEE
TEMP RANGE
-55擄C to +125擄C
-55擄C to +125擄C
-55擄C to +125擄C
PIN-PACKAGE
16 QSOP
16 QSOP
16 QSOP
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
16 GND
15 STBY
14 SMBCLK
Typical Operating Circuit
0.1碌F
3V TO 5.5V
200鈩?/div>
V
CC
STBY
10k鈩?EACH
MAX1668
MAX1805
MAX1989
MAX1668
MAX1805
MAX1989
13 SMBDATA
12 ALERT
11 ADD0
10 ADD1
9
V
CC
DXP1
2200pF
SMBCLK
SMBDATA
ALERT
CLOCK
DATA
INTERRUPT
TO
碌C
*
DXN1
DXP4
2200pF
*
DXN4
ADD0 ADD1 GND
QSOP
( ) ARE FOR MAX1805.
*
DIODE-CONNECTED TRANSISTOR
鈥燩atents
Pending
1
SMBus is a trademark of Intel Corp.
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.

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MAX1989

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