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MAX6680MEE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17
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
Features
♦ Two Alarm Outputs: ALERT and OVERT
♦ Pin-Programmable Threshold for OVERT Limit
♦ Programmable Under/Overtemperature ALERT
Limit
♦ Dual Channel: Measures Remote and Local
Temperature
♦ 11-Bit, 0.125°C Resolution for Remote Temperature
Measurements
♦ High Accuracy ±1°C (max) from +60°C to +100°C
(Remote)
♦ No Calibration Required
♦ SMBus/I
2
C™-Compatible Interface
♦ SMBus Timeout Prevents SMBus Lockup
MAX6680/MAX6681
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
________________________________________________________________ Maxim Integrated Products 1
CLOCK
DATA
TO SYSTEM
SHUTDOWN
STBY
CRIT1CRIT0GND
OVERT
SMBCLK
RESET
SMBDATA
V
CC
INTERRUPT
TO µP
0.1µF
2200pF
DXN
MICROPROCESSOR
DXP
200Ω
10kΩ
EACH
ALERT
3.3V
INT_SEL
SENS_SEL
ADD1
ADD0
MAX6680
MAX6681
Typical Operating Circuit
Ordering Information
19-2305; Rev 1; 1/05
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.
PART TEMP RANGE PIN-PACKAGE
MAX6680MEE -55°C to +125°C 16 QSOP
MAX6681MEE -55°C to +125°C 16 QSOP
SMBus is a trademark of Intel Corp.
I
2
C is a trademark of Philips Corp.
Pin Configurations appear at end of data sheet.
Desktop Computers
Notebook
Computers
Servers
Thin Clients
Workstations
MAX6680/MAX6681
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Typical Operating Circuit, V
CC
= 3.0V to 5.5V, T
A
= -25°C to +125°C, unless otherwise specified. Typical values are at V
CC
= 3.3V and T
A
= +25°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.
V
CC
...........................................................................-0.3V to +6V
DXP.............................................................-0.3V to (V
CC
+ 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 (T
A
= +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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
1°C
Temperature Resolution,
Legacy Mode
8 Bits
0.125 °C
Temperature Resolution,
Extended Mode
11 Bits
T
RJ
= +60°C to +100°C, V
CC
= 3.3V -1.0 +1.0
T
RJ
= +50°C to +120°C, V
CC
= 3.3V -2.0 +2.0Rem ote Tem p er atur e E r r or ( N ote 1)
T
RJ
= -55°C to +125°C, V
CC
= 3.3V -3.0 +3.0
°C
T
A
= +60°C to +100°C, V
CC
= 3.3V -1.5 +1.5
T
A
= 0°C to +125°C, V
CC
= 3.3V -3.0 +3.0
Local Temperature Error
T
A
= -55°C to +125°C, V
CC
= 3.3V (Note 2) -5.0 +5.0
°C
Line Regulation 3.0V ≤ V
CC
≤ 5.5V 0.2 0.6 m°C/V
Supply Voltage Range V
CC
3.0 5.5 V
Undervoltage Lockout Threshold UVLO Falling edge of V
CC
disables ADC 2.60 2.80 2.95 V
Undervoltage Lockout Hysteresis 90
mV
Power-On Reset (POR)
Threshold
V
CC
, falling edge 1.5 2.0 2.5 V
POR Threshold Hysteresis 90 mV
Legacy 62.5
Conversion Time
Extended 125
ms
Standby Supply Current SMBus static 3 10 µA
Operating Current During conversion 0.55 1.0 mA
0.25 conversions/s 35 70
Average Operating Current
(Note 3)
2 conversions/s 120 180
µA
DXP and DXN Leakage Current In standby mode 2 µA
High level 80 100 120
Remote-Diode Source Current I
RJ
Low level 8 10 12
µA
MAX6680/MAX6681
±1°C Fail-Safe Remote/Local Temperature
Sensors with SMBus Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Typical Operating Circuit, V
CC
= 3.0V to 5.5V, T
A
= -25°C to +125°C, unless otherwise specified. Typical values are at V
CC
= 3.3V and T
A
= +25°C.)
Note 1: T
A
= +25°C to +85°C.
Note 2: If both the local and the remote junction are below T
A
= -20°C, then V
CC
> 3.15V.
Note 3: Conversions done in extended mode. For legacy mode, current is approximately half.
Note 4: Timing specifications guaranteed by design.
Note 5: The serial interface resets when SMBCLK or SMBDATA is low for more than t
TIMEOUT
.
Note 6: A transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s falling edge.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CRIT0, CRIT1, ADD0, ADD1, RESET, INT_SEL, SENS_SEL
Logic Input Low Voltage V
IL
0.8 V
Logic Input High Voltage V
IH
2.4 V
Input Leakage Current I
LEAK
-1 +1 µA
(ALERT, OVERT)
Output Low Sink Current V
OL
= 0.4V 1 mA
Output High Leakage Current V
OH
= 5.5V 1 µA
SMBus INTERFACE (SMBCLK, SMBDATA, STBY)
Logic Input Low Voltage V
IL
0.8 V
V
CC
= 3.0V 2.2
Logic Input High Voltage V
IH
V
CC
= 5.5V 2.4
V
Input Leakage Current I
LEAK
V
IN
= GND or V
CC
±2 µA
Output Low Sink Current I
OL
V
OL
= 0.6V 6 mA
Input Capacitance C
IN
5pF
SMBus-COMPATIBLE TIMING (Note 5)
Serial Clock Frequency (Note 5) f
SCL
100 kHz
Bus Free Time Between STOP
and START Condition
t
BUF
4.7 µs
START Condition Setup Time 4.7 µs
Repeat START Condition Setup
Time
t
SU:STA
90% to 90% 50 ns
START Condition Hold Time t
HD:STA
10% of SMBDATA to 90% of SMBCLK 4 µs
STOP Condition Setup Time t
SU:STO
90% of SMDCLK to 90% of SMBDATA 4 µs
Clock Low Period t
LOW
10% to 10% 4.7 µs
Clock High Period t
HIGH
90% to 90% 4 µs
Data Setup Time (Note 6) t
HD:DAT
250 ns
Receive SCL/SDA Rise Time t
R
1µs
Receive SCL/SDA Fall Time t
F
300 ns
Pulse Width of Spike Suppressed t
SP
050ns
SMBus Timeout (Note 5) SMBDATA low period for interface reset 25 37 45 ms
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P17

MAX6680MEE+

Mfr. #:
Buy MAX6680MEE+
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors Fail-Safe Temperature Sensor
Lifecycle:
New from this manufacturer.
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