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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6680 Datasheet

(MAX6680 / MAX6681) Fail-Safe Remote/Local Temperature Sensors

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MAX6680 pdf
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19-2305; Rev 0; 4/02
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
General Description
The MAX6680/MAX6681 are precise, two-channel digi-
tal thermometers. Each accurately measures the tem-
perature of its own die and one remote PN junction and
reports the temperature on a 2-wire serial interface. The
remote junction can be a diode-connected transistor
like the low-cost NPN type 2N3904 or PNP type
2N3906. The remote junction can also be a common-
collector PNP, such as a substrate PNP of a micro-
processor.
The MAX6680/MAX6681 include pin-programmable
default temperature thresholds for the OVERT output,
which provides fail-safe clock throttling or system shut-
down. In addition, the devices are pin programmable to
select whether the OVERT output responds to either the
local, remote, or both temperatures.
The 2-wire serial interface accepts standard System
Management Bus (SMBus)™ commands such as Write
Byte, Read Byte, Send Byte, and Receive Byte to read
the temperature data and program the alarm thresholds
and conversion rate. The MAX6680/MAX6681 can func-
tion autonomously with a programmable conversion
rate, which allows the control of supply current and
temperature update rate to match system needs. For
conversion rates of 4Hz or less, the remote sensor tem-
perature can be represented in extended mode as 10
bits + sign with a resolution of 0.125°C. When the con-
version rate is 8Hz, output data is 7 bits + sign with a
resolution of 1°C. The MAX6680/MAX6681 also include
an SMBus timeout feature to enhance system reliability.
The MAX6681 is an upgrade to the MAX6654. The
MAX6680/MAX6681 remote accuracy is ±1°C with no
calibration needed. They are available in a 16-pin
QSOP package and operate throughout the -55°C to
+125°C temperature range.
Applications
Desktop Computers
Notebook
Computers
Servers
Thin Clients
Workstations
Pin Configurations appear at end of data sheet.
Features
o Two Alarm Outputs: ALERT and OVERT
o Pin-Programmable Threshold for OVERT Limit
o Programmable Under/Overtemperature ALERT
Limit
o Dual Channel: Measures Remote and Local
Temperature
o 11-Bit, 0.125°C Resolution for Remote Temperature
Measurements
o High Accuracy ±1°C (max) from +60°C to +100°C
(Remote)
o No Calibration Required
o SMBus/I2C™-Compatible Interface
o SMBus Timeout Prevents SMBus Lockup
PART
MAX6680MEE
MAX6681MEE
Ordering Information
TEMP RANGE
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
16 QSOP
16 QSOP
Typical Operating Circuit
0.1µF
2003.3V
DXP VCC STBY
SMBDATA
MICROPROCESSOR
2200pF
DXN
MAX6680
MAX6681
SENS_SEL
INT_SEL
ADD0
SMBCLK
ALERT
RESET
OVERT
ADD1 GND CRIT0 CRIT1
10k
EACH
DATA
CLOCK
INTERRUPT
TO µP
TO SYSTEM
SHUTDOWN
SMBus is a trademark of Intel Corp.
I2C is a trademark of Philips Corp.
________________________________________________________________ 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

MAX6680 Datasheet

(MAX6680 / MAX6681) Fail-Safe Remote/Local Temperature Sensors

No Preview Available !

MAX6680 pdf
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
ABSOLUTE MAXIMUM RATINGS
VCC ...........................................................................-0.3V to +6V
DXP.............................................................-0.3V to (VCC + 0.3V)
DXN ......................................................................-0.3V to +0.8V
SMBCLK, SMBDATA, ALERT, OVERT .....................-0.3V to +6V
RESET, INT_SEL, STBY, ADD0, ADD1.....................-0.3V to +6V
CRIT1, CRIT0, SENS_SEL ........................................-0.3V to +6V
SMBDATA, ALERT, OVERT, Current ..................-1mA to +50mA
DXN Current ......................................................................±1mA
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C) ..........664mW
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
(Circuit of Typical Operating Circuit, VCC = 3.0V to 5.5V, TA = -25°C to +125°C, unless otherwise specified. Typical values are at VCC
= 3.3V and TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
Temperature Resolution,
Legacy Mode
Temperature Resolution,
Extended Mode
Remote Temperature Error (Note 1)
Local Temperature Error
Line Regulation
Supply Voltage Range
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
VCC
UVLO
TRJ = +60°C to +100°C, VCC = 3.3V
TRJ = +50°C to +120°C, VCC = 3.3V
TRJ = -55°C to +125°C, VCC = 3.3V
TA = +60°C to +100°C, VCC = 3.3V
TA = 0°C to +125°C, VCC = 3.3V
TA = -55°C to +125°C, VCC = 3.3V (Note 2)
3.0V VCC 5.5V
Falling edge of VCC disables ADC
MIN
1
0.125
-1.0
-2.0
-3.0
-1.5
-3.0
-5.0
3.0
2.60
TYP
8
11
0.2
2.80
90
MAX
+1.0
+2.0
+3.0
+1.5
+3.0
+5.0
0.6
5.5
2.95
UNITS
°C
Bits
°C
Bits
°C
°C
m°C/V
V
V
mV
Power-On Reset (POR)
Threshold
POR Threshold Hysteresis
Conversion Time
Standby Supply Current
Operating Current
Average Operating Current
(Note 3)
DXP and DXN Leakage Current
Remote-Diode Source Current
VCC, falling edge
Legacy
Extended
SMBus static
During conversion
0.25 conversions/s
2 conversions/s
In standby mode
High level
IRJ Low level
1.5 2.0 2.5
90
62.5
125
3 10
0.55 1.0
35 70
120 180
2
80 100 120
8 10 12
V
mV
ms
µA
mA
µA
µA
µA
2 _______________________________________________________________________________________


Part Number MAX6680
Description (MAX6680 / MAX6681) Fail-Safe Remote/Local Temperature Sensors
Maker Maxim Integrated Products
Total Page 17 Pages
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