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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6690 Datasheet

2C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface

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MAX6690 pdf
19-2190; Rev 0; 10/01
2°C Accurate Remote/Local Temperature
Sensor with SMBus Serial Interface
General Description
The MAX6690is 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 (SMBusTM), 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
Desktop Computers
Notebook Computers
Servers
Thin Clients
Workstations
Test and Measurement
Multichip Modules
SMBus is a trademark of Intel Corp.
I2C is a trademark of Philips Corp.
Patents pending.
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 I2C™-Compatible/SMBus Interface
o +3V to +5.5V Supply Range
PART
MAX6690MEE
Ordering Information
TEMP. RANGE
-55°C to +125°C
PIN-PACKAGE
16 QSOP
Typical Operating Circuit
0.1µF
200
+3V TO +5V SUPPLY
CPU VCC STBY
MAX6690
DXP SMBCLK
SMBDATA
DXN
2200pF
ALERT
ADD0 ADD1 GND
10kEACH
CLOCK
DATA
INTERRUPT TO µC
Pin Configuration
TOP VIEW
N.C. 1
VCC 2
DXP 3
DXN 4
N.C. 5
ADD1 6
GND 7
GND 8
MAX6690
QSOP
16 N.C.
15 STBY
14 SMBCLK
13 N.C.
12 SMBDATA
11 ALERT
10 ADD0
9 N.C.
________________________________________________________________ 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

MAX6690 Datasheet

2C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface

No Preview Available !

MAX6690 pdf
2°C Accurate Remote/Local Temperature
Sensor with SMBus Serial Interface
ABSOLUTE MAXIMUM RATINGS
(All voltages are referenced to GND unless otherwise noted.)
VCC ..........................................................................-0.3V to +6V
DXP, ADD_ .................................................-0.3V to (VCC + 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 (TA = +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
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 = +3V to +5.5V, TA = -55°C to +125°C, unless otherwise noted. Typical values are at VCC = +3.3V and TA = +25°C.)
PARAMETER
SYMBOL
TEMPERATURE-TO-DIGITAL CONVERTER
Accuracy (Local Sensor)
Accuracy (Remote Sensor)
Line Regulation
CONDITIONS
+60°C TA +100°C, VCC = +3.3V
0°C TA +100°C, VCC = +3.3V
-55°C TA +120°C, VCC = +3.3V
+70°C TRJ +100°C, VCC = +3.3V (Note 1)
0°C TRJ +100°C, VCC = +3.3V (Note 1)
-55°C TRJ +120°C, VCC = +3.3V (Notes 1, 2)
Resolution (Legacy Mode)
Conversion rate >1Hz
Resolution (Extended Mode)
Undervoltage Lockout
Threshold
UVLO
Conversion rate 1Hz
VCC input, disables A/D conversion,
rising edge
MIN
-2.5
-3.5
-5.0
-2
-3.5
-5
+1
+0.125
+2.60
TYP
0.2
+8
+11
+2.80
MAX
+2.5
+3.5
+5.0
+2
+3.5
+5
0.5
+2.95
Undervoltage Lockout
Hysteresis
Supply Voltage Range
Power-On Reset (POR) Threshold
POR Threshold Hysteresis
Standby Current
Operating Current
Average Operating Current
Conversion Time
Conversion Timing Error
Remote-Diode Current
VCC
VCC, falling edge
tCONV
SMBus static
During conversion
0.25 conversion/s (Note 3)
2 conversion/s (Note 3)
From stop bit to conversion completed, in
legacy mode (Note 3)
High level
IRJ Low level
+3.0
+1.5
+95
+80
+8
+90
+2.0
+90
+3
+0.55
+40
+150
+125
+100
+10
+5.5
+2.5
+10
+1
+70
+250
+156
±25
+120
+12
UNITS
°C
°C
°C
°C
Bits
°C
Bits
V
mV
V
V
mV
µA
mA
µA
ms
%
µA
2 _______________________________________________________________________________________


Part Number MAX6690
Description 2C Accurate Remote/Local Temperature Sensor with SMBus Serial Interface
Maker Maxim
Total Page 16 Pages
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