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PDF MAX6685 Data sheet ( Hoja de datos )
| Número de pieza | MAX6685 | |
| Descripción | (MAX6685 / MAX6686) Dual-Output Remote-Junction Temperature Switches | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MAX6685 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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19-2459; Rev 2; 4/03
Dual-Output Remote-Junction
Temperature Switches
General Description
MAX6685/MAX6686 are dual-output temperature switches
that use an external diode-connected transistor as a sens-
ing element. These devices have two logic outputs (THIGH
and TLOW). THIGH asserts a logic signal when the remote
temperature crosses the factory-programmed, +120°C, or
+125°C upper trip threshold. TLOW is asserted when the
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.
THIGH is an open-drain, active-low output for both the
MAX6685 and the MAX6686. TLOW is a CMOS push-pull,
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
Fan Control
Multichip Modules
FPGA Temperature
Protection
Features
o Pin-Programmed Lower Temperature Threshold
from +40°C to +80°C or +75°C to +115°C
(5°C Increments)
o Preset Upper Threshold: +120°C or +125°C
o Open-Drain, Active-Low Output for Upper
Temperature Alarm
o CMOS Push-Pull, Active-High or Open-Drain,
Active-Low Output for Lower Temperature Alarm
o 1.5°C Accuracy
o 3.0V to 5.5V, 200µA Supply
o 8-Pin µMAX Package
Pin Configurations appear at end of data sheet.
Ordering Information
PART
MAX6685AU40L
MAX6685AU40H
MAX6685AU75L
MAX6685AU75H
MAX6686AU40L
MAX6686AU40H
MAX6686AU75L
MAX6686AU75H
TLOW
OUTPUT
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
TLOW TRIP
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
THIGH TRIP
THRESHOLD (0°C)
+120°C
+125°C
+120°C
+125°C
+120°C
+125°C
+120°C
+125°C
PIN-PACKAGE
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
Typical Operating Circuits
3.3V TO SYSTEM
SHUTDOWN
CPU
VDD
DXP THIGH
12V
CPU
3.3V
VDD
DXP THIGH
TO SYSTEM
SHUTDOWN
CS MAX6685
DXN
S1
S2 TLOW
GND
N
CS MAX6686
DXN
S1
S2 TLOW
GND
TO CLOCK
THROTTLE
CONTROL
________________________________________________________________ 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.
1 page  
Dual-Output Remote-Junction
Temperature Switches
Table 1. Lower Temperature Trip Threshold Selection
S1
GND
GND
GND
FLOAT
FLOAT
FLOAT
VDD
VDD
VDD
S2
GND
FLOAT
VDD
GND
FLOAT
VDD
GND
FLOAT
VDD
MAX6685AUA40L
MAX6685AUA40H
MAX6686AUA40L
MAX6686AUA40H
LOWER TEMPERATURE
TRIP THRESHOLD (°C)
+40
+45
+50
+55
+60
+65
+70
+75
+80
MAX6685AUA75L
MAX6685AUA75H
MAX6686AUA75L
MAX6686AUA75H
LOWER TEMPERATURE
TRIP THRESHOLD (°C)
+75
+80
+85
+90
+95
+100
+105
+110
+115
Noise-Filtering Capacitors
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.
Table 2. Sensor Transistor Manufacturers
MANUFACTURER
MODEL NO.
Central Semiconductor (USA)
CMPT3904
ON Semiconductor (USA)
2N3904, 2N3906
Rohm Semiconductor (Japan)
SST3904
Samsung (Korea)
KST3904-TF
Siemens (Germany)
SMBT3904
Note: Discrete transistors must be diode connected (base
shorted to collector).
VDD
THIGH
+120°C OR +125°C
DXP REMOTE
TEMPERATURE
DXN CONVERTER
S1 TLOW
S2 +40°C TO +115°C
THIGH
N
DIGITAL
DRIVER
TLOW
GND MAX6685
VDD
THIGH
+120°C OR +125°C
DXP REMOTE
TEMPERATURE
DXN CONVERTER
S1 TLOW
S2 +40°C TO +115°C
GND MAX6686
THIGH
N
TLOW
N
Figure 1. MAX6685 Functional Diagram
Figure 2. MAX6686 Functional Diagram
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet MAX6685.PDF ] | |
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