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MAX6690MEE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
General Description
The MAX6690 is a precise digital thermometer that
reports the temperature of both a remote P-N junction
and its own die. The remote junction can be a diode-con-
nected transistor—typically a low-cost, easily mounted
2N3904 NPN type or 2N3906 PNP type—that replaces
conventional thermistors or thermocouples. Remote
accuracy is ±2°C for multiple transistor manufacturers,
with no calibration needed. The remote junction can also
be a common-collector PNP, such as a substrate PNP of
a microprocessor (µP).
The 2-wire serial interface accepts standard System
Management Bus (SMBus
TM
), Write Byte, Read Byte,
Send Byte, and Receive Byte commands to program the
alarm thresholds and to read temperature data.
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 conversion rate allows the user to
optimize supply current and temperature update rate to
match system needs. When the conversion rate is faster
than 1Hz, the conversion results are available as a 7-bit-
plus-sign byte with a 1°C LSB. When the conversion rate
is 1Hz or slower, the MAX6690 enters the extended
mode. In this mode, 3 additional bits of temperature data
are available in the extended resolution register, provid-
ing 10-bit-plus-sign resolution with a 0.125°C LSB.
Single-shot conversions also have 0.125°C per LSB reso-
lution when the conversion rate is 1Hz or slower.
A parasitic resistance cancellation (PRC) mode can also
be invoked for conversion rates of 1Hz or slower by set-
ting bit 4 of the configuration register to 1. In PRC mode,
the effect of series resistance on the leads of the external
diode is canceled. The 11-bit conversion in PRC mode is
performed in < 500ms and is disabled for conversion
rates faster than 1Hz. The one-shot conversion is also 11
bits in < 500ms.
The MAX6690 default low-temperature measurement
limit is 0°C. This can be extended to -64°C by setting bit
5 of the configuration register to 1.
The MAX6690 is available in a small, 16-pin QSOP sur-
face-mount package.
________________________Applications
Features
o High Accuracy ±2°C (max) from +70°C to +100°C
(Remote)
o 11-Bit, 0.125°C Resolution
o Dual Channel: Measures Remote and Local
Temperature
o No Calibration Required
o Programmable Under/Overtemperature Alarms
o I
2
C-Compatible/SMBus Interface
o +3V to +5.5V Supply Range
MAX6690
2°C Accurate Remote/Local Temperature
Sensor with SMBus Serial Interface
________________________________________________________________
Maxim Integrated Products
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
N.C. N.C.
STBY
SMBCLK
N.C.
SMBDATA
ALERT
ADD0
N.C.
TOP VIEW
MAX6690
QSOP
V
CC
DXP
ADD1
DXN
N.C.
GND
GND
Pin Configuration
V
CC
DXP
CPU
DXN
STBY
10kΩ EACH
CLOCK
DATA
INTERRUPT TO μC
+3V TO +5V SUPPLY
200Ω
0.1μF
SMBCLK
SMBDATA
ALERT
GND
ADD0 ADD1
2200pF
MAX6690
Typical Operating Circuit
19-2190; Rev 2; 4/09
Ordering Information
Desktop Computers
Notebook Computers
Servers
Thin Clients
Workstations
Test and Measurement
Multichip Modules
SMBus is a trademark of Intel Corp.
PART TEMP RANGE PIN-PACKAGE
MAX6690MEE
-55°C to +125°C
16 QSOP
MAX6690
2°C Accurate Remote/Local Temperature
Sensor with SMBus Serial Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3V to +5.5V, T
A
= -55°C to +125°C, unless otherwise noted. 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.
(All voltages are referenced to GND unless otherwise noted.)
V
CC
..........................................................................-0.3V to +6V
DXP, ADD_ .................................................-0.3V to (V
CC
+ 0.3V)
DXN ......................................................................-0.3V to +0.8V
SMBCLK, SMBDATA, ALERT, STBY.. ......................-0.3V to +6V
SMBDATA, ALERT Current .................................-1mA to +50mA
DXN Current ......................................................................±1mA
ESD Protection (all pins, Human Body Model). .................2000V
Continuous Power Dissipation (T
A
= +70°C)
16-Pin 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 +165°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TEMPERATURE-TO-DIGITAL CONVERTER
+60°C ≤ T
A
≤ +100°C, V
CC
= +3.3V -2.5 +2.5
0°C ≤ T
A
≤ +100°C, V
CC
= +3.3V -3.5 +3.5
Accuracy (Local Sensor)
-55°C ≤ T
A
≤ +120°C, V
CC
= +3.3V -5.0 +5.0
°C
+ 70° C ≤ T
R J
≤ + 100° C , V
C C
= + 3.3V ( N ote 1) -2 +2
0°C ≤ T
RJ
≤ +100°C, V
CC
= +3.3V (Note 1) -3.5 +3.5Accuracy (Remote Sensor)
- 55°C ≤ T
RJ
≤ +120°C , V
C C
= + 3.3V ( Notes 1, 2) -5 +5
°C
Line Regulation 0.2 0.5 °C
+1 °C
Resolution (Legacy Mode) Conversion rate >1Hz
+8 Bits
+0.125 °C
Resolution (Extended Mode) Conversion rate ≤1Hz
+11 Bits
Undervoltage Lockout
Threshold
UVLO
V
CC
input, disables A/D conversion,
rising edge
+2.60 +2.80 +2.95 V
Undervoltage Lockout
Hysteresis
+90 mV
Supply Voltage Range V
CC
+3.0 +5.5 V
P ow er - O n Reset ( P O R) Thr eshol d V
CC
, falling edge +1.5 +2.0 +2.5 V
POR Threshold Hysteresis +90 mV
Standby Current SMBus static +3 +10 µA
Operating Current During conversion +0.55 +1 mA
0.25 conversion/s (Note 3) +40 +70
Average Operating Current
2 conversion/s (Note 3) +150 +250
µA
Conversion Time t
CONV
From stop bit to conversion completed, in
legacy mode (Note 3)
+95 +125 +156 ms
Conversion Timing Error ±25 %
High level +80 +100 +120
Remote-Diode Current I
RJ
Low level +8 +10 +12
µA
MAX6690
2°C Accurate Remote/Local Temperature
Sensor with SMBus Serial Interface
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3V to +5.5V, T
A
= -55°C to +125°C, unless otherwise noted. Typical values are at V
CC
= +3.3V and T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Logic Input Low Voltage V
IL
V
CC
= +3.0V to +5.5V +0.8 V
V
CC
= +3.0V +2.2
Logic Input High Voltage V
IH
V
CC
= +5.5V +2.6
V
Input Leakage Current I
LEAK
V
IN
= GND or V
CC
±2µA
V
OL
= +0.6V +6
Output Low Sink Current I
OL
V
OL
= +0.4V +1
mA
Input Capacitance C
IN
+5 pF
Output High Leakage Current V
OH
= +5.5V +1 µA
Serial Clock Frequency f
SCL
(Note 4) 0 +100 kHz
Bus Free Time Between STOP
and START Conditions
t
BUF
+4.7 µs
START Condition Setup Time +4.7 µs
Repeat START Condition Setup
Time
t
SU:STA
90% to 90% +50 µs
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 SMBCLK to 10% of SMBDATA662 +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 t
SU:DAT
90% of SMBDATA to 10% of SMBCLK +250 ns
Data Hold Time t
HD:DAT
(Note 5) 0 µs
Receive SCL/SDA Rise Time t
R
+1 µs
Receive SCL/SDA Fall Time t
F
+300 ns
SMBus Timeout t
TIMEOUT
SMBDATA and SMBCLK time low for reset
of serial interface
+25 +40 ms
Note 1: +25°C ≤ T
A
≤ +85°C.
Note 2: If both the MAX6690 and the remote junction are below T
A
= -20°C, then V
CC
> 3.15V.
Note 3: The conversion time doubles for the extended resolution mode. This causes the average operating current to approximately
double.
Note 4: The serial interface resets when SMBCLK is low for more than t
TIMEOUT
.
Note 5: Note that a transition must internally provide at least a hold time to bridge the undefined region (300ns max) of SMBCLK’s
falling edge.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX6690MEE+

Mfr. #:
Buy MAX6690MEE+
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors Remote/Local Temperature Sensor
Lifecycle:
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