MAX6686 [MAXIM]
Dual-Output Remote-Junction Temperature Switches ; 双输出，远端结温温度开关\n
| 型号： | MAX6686 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Dual-Output Remote-Junction Temperature Switches
|
| 文件： | 总7页 (文件大小：146K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2459; Rev 1; 1/03
Dual-Output Remote-Junction
Temperature Switches
General Description
Features
MAX6685/MAX6686 are dual-output temperature switches
that use an external diode-connected transistor as a sens-
ꢀ Pin-Programmed Lower Temperature Threshold
from +40°C to +80°C or +75°C to +115°C
(5°C Increments)
ing element. These devices have two logic outputs (T
HIGH
and T
). T
asserts a logic signal when the remote
LOW
HIGH
ꢀ Preset Upper Threshold: +120°C or +125°C
temperature crosses the factory-programmed, +120°C, or
+125°C upper trip threshold. T is asserted when the
LOW
ꢀ Open-Drain, Active-Low Output for Upper
remote temperature exceeds the lower threshold, which is
controlled by pins S1 and S2. The lower thresholds are
available in two ranges in 5°C increments. The two ranges
are +40°C to +80°C and +75°C to +115°C. Hysteresis for
both outputs to be deasserted is typically 5°C.
Temperature Alarm
ꢀ CMOS Push-Pull, Active-High or Open-Drain,
Active-Low Output for Lower Temperature Alarm
ꢀ 1.5°C Accuracy
T
is an open-drain, active-low output for both the
HIGH
ꢀ 3.0V to 5.5V, 200µA Supply
ꢀ 8-Pin µMAX Package
MAX6685 and the MAX6686. T
is a CMOS push-pull,
LOW
active-high output for the MAX6685 and is an open-drain,
active-low output for the MAX6686. They are available in
a space-saving 8-pin µMAX package.
Applications
CPU Temperature
Protection
Multichip Modules
FPGA Temperature
Protection
Pin Configurations appear at end of data sheet.
Fan Control
Ordering Information
T
T
TRIP
T
TRIP
HIGH
LOW
LOW
PART
PIN-PACKAGE
OUTPUT
RANGE (0°C)
+40°C to +80°C
+40°C to +80°C
+75°C to +115°C
+75°C to +115°C
+40°C to +80°C
+40°C to +80°C
+75°C to +115°C
+75°C to +115°C
THRESHOLD (0°C)
MAX6685UA40L
MAX6685UA40H
MAX6685UA75L
MAX6685UA75H
MAX6686UA40L
MAX6686UA40H
MAX6686UA75L
MAX6686UA75H
Push-pull, active high
Push-pull, active high
Push-pull, active high
Push-pull, active high
Open drain, active low
Open drain, active low
Open drain, active low
Open drain, active low
+120°C
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
+125°C
+120°C
+125°C
+120°C
+125°C
+120°C
+125°C
Typical Operating Circuits
3.3V
3.3V
TO SYSTEM
SHUTDOWN
V
V
DD
DD
TO SYSTEM
SHUTDOWN
12V
DXP
DXP
T
T
HIGH
HIGH
CPU
CPU
C
S
C
S
MAX6685
MAX6686
DXN
S1
DXN
S1
TO CLOCK
THROTTLE
CONTROL
T
T
LOW
N
LOW
S2
S2
GND
GND
________________________________________________________________ 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.
Dual-Output Remote-Junction
Temperature Switches
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND
, T
Continuous Power Dissipation (T = +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C).............330mW
A
V
T
.....................................................-0.3V to +6V
DD, LOW HIGH
DXN .......................................................................-0.3V to +0.8V
All Other Pins..............................................-0.3V to (V + 0.3V)
Input Current.........................................................................5mA
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
DD
Output Current ....................................................................20mA
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
(V
= 3.0V to 5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
= 3.3V and T = +25°C.) (Note 1)
DD A
DD
A
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
5.5
UNITS
V
Power-Supply Range
V
3.0
DD
DD
Average Supply Current
I
200
400
500
µA
Supply Current During
Conversion
800
2.0
µA
Power-On Reset Threshold
POR Threshold Hysteresis
POR
V
V
falling edge
1.0
1.5
50
V
DD
DD
mV
= 3.3V, T = +25°C, T = 0°C to +125°C
A
RJ
-1.5
+1.5
Temperature Threshold
Accuracy
(Note 2)
T
°C
TH
T
= 0°C to +100°C, T = 0°C to +125°C
2.0
5.0
A
RJ
Temperature Threshold
Hysteresis
T
°C
°C/V
V
HYST
Supply Sensitivity of Temperature
Threshold
T
= +25°C, T = 0°C to +125°C,
RJ
= 3.0V to 5.5V
A
0.6
V
DD
V
-
DD
Output Voltage High
V
I
I
= 1mA, MAX6685 T
only
LOW
OH
SOURCE
0.2
Output Voltage Low
Logic-Low Input Voltage
Logic-High Input Voltage
Input Current
V
= 1mA
SINK
0.2
0.4
V
V
OL
V
S1, S2
S1, S2
S1, S2
IL
V
1.8
V
IH
10
1
µA
Open-Drain Output Leakage
Current
V
= 5.5V, T
and T
HIGH
µA
OUT
LOW
Conversion Time
Sample Period
0.09
0.35
80
0.11
0.45
100
10
0.13
0.55
120
12
s
s
High level
Low level
Current Sourcing for External
Diode
µA
8
Note 1: All parameters are tested at +25°C. Temperature specifications over a range of -40°C to +125°C are guaranteed by design.
Note 2: T is the temperature of the remote-sensing diode junction.
RJ
2
_______________________________________________________________________________________
Dual-Output Remote-Junction
Temperature Switches
Typical Operating Characteristics
(V
= 3.3V, C = 2200pF, T = +25°C, unless otherwise noted. See Typical Operating Circuits.)
S A
DD
AVERAGE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
TEMPERATURE TRIP THRESHOLD ERROR
AVERAGE SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
vs. C CAPACITANCE
S
250
200
150
100
50
10
8
200
MAX6685U40H
S1 = S2 = GND
180
160
140
120
100
6
4
2
0
0
3.0
3.5
4.0
4.5
5.0
5.5
0
10
20
30
40
50
60
-50 -25
0
25
50
75 100 125
SUPPLY VOLTAGE (V)
C
CAPACITANCE (nF)
AMBIENT TEMPERATURE ( C)
S
UPPER TEMPERATURE TRIP THRESHOLD
ERROR vs. AMBIENT TEMPERATURE
LOWER TEMPERATURE TRIP THRESHOLD
ERROR vs. AMBIENT TEMPERATURE
2.0
1.6
2.0
1.6
MAX6685U40H
MAX6685U40H
T
TRIP = +125 C
S1 = S2 = V
HIGH
DD
1.2
1.2
0.8
0.8
0.4
0.4
0
0
-0.4
-0.8
-1.2
-1.6
-2.0
-0.4
-0.8
-1.2
-1.6
-2.0
-50 -25
0
25
50
75 100 125
-50 -25
0
25
50
75 100 125
AMBIENT TEMPERATURE ( C)
AMBIENT TEMPERATURE ( C)
_______________________________________________________________________________________
3
Dual-Output Remote-Junction
Temperature Switches
Pin Description
PIN
NAME
FUNCTION
MAX6685 MAX6686
1
2
1
2
V
Power-Supply Input. Bypass to GND with a 0.1µF capacitor.
DD
GND Ground
This pin connects to the positive (anode) terminal of the external P-N sense junction. It sources
current into the external junction. A 2200pF capacitor should be connected across DXP and DXN.
3
3
DXP
DXN
This pin connects to the negative (cathode) terminal of the external P-N sense junction. It sinks
current from the external junction. A 2200pF capacitor should be connected across DXP and
DXN. DXN must be connected to the GND pin with the shortest possible connection.
4
4
Open-Drain, Active-Low Output. T
goes low when the temperature exceeds the factory-
HIGH
programmed upper temperature threshold, either +120°C or +125°C. Connect a pullup resistor
(typically 10k ) between T and a positive supply up to 5.5V.
5
6
5
—
6
T
HIGH
HIGH
CMOS Push-Pull, Active-High Output. T
goes HIGH when the temperature exceeds the pin-
LOW
T
LOW
programmed lower temperature threshold.
Open-Drain, Active-Low Output. T goes LOW when the temperature exceeds the pin-
LOW
programmed lower temperature threshold. Connect a pullup resistor (typically 10k ) between
and a positive supply up to 5.5V.
—
T
LOW
T
LOW
Threshold Select Input. Used in conjunction with S2 to set the lower threshold for T
It can be connected to V , GND, or left floating.
DD
(Table 1).
LOW
7
8
7
8
S1
S2
Threshold Select Input. Used in conjunction with S1 to set the lower threshold for T
(Table 1).
LOW
It can be connected to V , GND, or left floating.
DD
ture ranges are available for the lower trip threshold:
+40°C to +80°C and +75°C to +115°C. S1 and S2 pins
must be set to the desired trip temperature before power
Detailed Description
The MAX6685/MAX6686 dual-output remote-sensing
junction temperature switches incorporate a precision
remote-junction temperature sensor and two compara-
tors. These devices use an external P-N junction as the
temperature-sensing element (see Typical Operating
Circuits).
is applied to the V
pin. If this is done after the power is
DD
turned on, the lower trip threshold remains set to the
point where S1 and S2 were when power was applied.
Applications Information
The MAX6685/MAX6686 provide noise immunity by
integration and oversampling of the diode voltage, but
good design practice includes routing the DXP and
DXN lines away from noise sources, such as high-
speed digital lines, switching regulators, inductors, and
transformers. The DXP and DXN traces should be
paired together and surrounded by a ground plane
whenever possible.
Remote-Diode Selection
The MAX6685/MAX6686 are optimized to measure the
die temperature of CPUs and other ICs that have on-chip
temperature-sensing diodes. These on-chip diodes are
substrate PNPs with their collectors grounded. Connect
the base of the PNP to DXN and the emitter to DXP. When
using a discrete, diode-connected NPN or PNP as a
sensing diode, use a good-quality small-signal device.
Examples are listed in Table 2. Tight specifications for for-
ward current gain indicate the manufacturer has good
process controls and that the devices have consistent
The 5°C hysteresis keeps the outputs from “chattering”
when the measured temperature is close to the threshold
temperature. The MAX6685/MAX6686 are available with
preset upper temperature thresholds of +120°C or
+125°C. The lower temperature thresholds are pin pro-
grammable in 5°C increments (Table 1). Two tempera-
V
characteristics. Always use a transistor for the sens-
be
ing junction; diodes do not work.
4
_______________________________________________________________________________________
Dual-Output Remote-Junction
Temperature Switches
Table 1. Lower Temperature Trip Threshold Selection
MAX6685AUA40L
MAX6685AUA75L
MAX6685AUA75H
MAX6686AUA75L
MAX6686AUA75H
MAX6685AUA40H
MAX6686AUA40L
MAX6686AUA40H
S1
S2
LOWER TEMPERATURE
LOWER TEMPERATURE
TRIP THRESHOLD (°C)
TRIP THRESHOLD (°C)
GND
GND
GND
+40
+45
+50
+55
+60
+65
+70
+75
+80
+75
+80
FLOAT
GND
V
+85
DD
FLOAT
FLOAT
FLOAT
GND
+90
FLOAT
+95
V
+100
+105
+110
+115
DD
V
V
V
GND
DD
DD
DD
FLOAT
V
DD
Noise-Filtering Capacitors
Table 2. Sensor Transistor Manufacturers
A quality ceramic capacitor must be connected across
the DXP/DXN inputs to maintain temperature threshold
accuracy by filtering out noise. The capacitor should be
located physically close to the DXP/DXN pins and
should typically have a value of 2200pF. Larger capaci-
tor values can cause temperature measurement errors.
A 50% variation from the recommended capacitor
value can cause up to 1°C error.
MANUFACTURER
Central Semiconductor (USA)
ON Semiconductor (USA)
Rohm Semiconductor (Japan)
Samsung (Korea)
MODEL NO.
CMPT3904
2N3904, 2N3906
SST3904
KST3904-TF
SMBT3904
Siemens (Germany)
Note: Discrete transistors must be diode connected (base
shorted to collector).
V
V
DD
DD
T
T
HIGH
HIGH
T
T
HIGH
HIGH
+120 C OR +125 C
+120 C OR +125 C
N
N
REMOTE
DXP
REMOTE
DXP
TEMPERATURE
TEMPERATURE
DXN
DXN
CONVERTER
CONVERTER
T
LOW
DIGITAL
DRIVER
N
T
LOW
S1
S2
S1
S2
T
T
LOW
LOW
+40 C TO +115 C
+40 C TO +115 C
MAX6686
MAX6685
GND
GND
Figure 1. MAX6685 Functional Diagram
Figure 2. MAX6686 Functional Diagram
_______________________________________________________________________________________
5
Dual-Output Remote-Junction
Temperature Switches
Pin Configurations
Chip Information
TRANSISTOR COUNT: 7765
PROCESS: BiCMOS
TOP VIEW
V
1
2
3
4
8
7
6
5
S2
S1
V
1
2
3
4
8
7
6
5
S2
S1
DD
DD
GND
DXP
DXN
GND
DXP
DXN
MAX6685
MAX6686
T
T
T
T
LOW
LOW
HIGH
HIGH
MAX
MAX
6
_______________________________________________________________________________________
Dual-Output Remote-Junction
Temperature Switches
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
4X S
8
8
MILLIMETERS
INCHES
DIM MIN
MAX
MAX
MIN
-
-
0.043
0.006
0.037
0.014
0.007
0.120
1.10
0.15
0.95
0.36
0.18
3.05
A
0.002
0.030
0.010
0.005
0.116
0.05
0.75
0.25
0.13
2.95
A1
A2
b
E
H
ÿ 0.50 0.1
c
D
e
0.0256 BSC
0.65 BSC
0.6 0.1
E
H
0.116
0.188
0.016
0∞
0.120
2.95
4.78
0.41
0∞
3.05
5.03
0.66
6∞
0.198
0.026
6∞
L
1
1
0.6 0.1
S
0.0207 BSC
0.5250 BSC
BOTTOM VIEW
D
TOP VIEW
A1
A2
A
c
e
L
b
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0036
J
1
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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