Rainbow Electronics MAX6508 - Manual (Page 6)

MAX6505–MAX6508
Dual Trip SOT Temperature Switches
6 _______________________________________________________________________________________
Figure 2. Temperature Response—MAX6507A04B Outputs
with 2°C Hysteresis Figure 3. Low-Power, High-Reliability, Fail-Safe Temperature
Monitor
+75
°
C
-10
°
C
HYSTERESIS ≈ 2 °
C
-10
°
C
HYSFERESIS ≈ 2 °
C
OVER
OK
TEMPERATURE
+2.5V TO +5.5V
SYSTEM
SHUTDOWN
FAN CONTROL S0
S1
WARN
GND
V CC
ALARM
MAX6506
*
* ∆T
AW = T ALARM - T WARN IS SET TO +30°C.
Table 2. Hysteresis Selection
TYPICAL THRESHOLD HYSTERESIS
PART
ALARM CONDITIONS WARN CONDITIONS OK, OVER
2 °C — 5 °C ∆TWA = 5°C or 10°C
MAX6505
MAX6506
— — 10 °C ∆TWA = 20°C or 30°C
—
-— — — — 2 °C S0 = GND
MAX6507
MAX6508
-— — — — 10 °C S0 = VCC
power is dissipated within the IC. This corresponds to a
+0.288°C shift in the die temperature in the SOT23-6.
Power Supply and Bypassing
The MAX6505 and MAX6508 operate from a single-
supply voltage in the +2.5V to +5.5V range. Connect a
0.1µF capacitor on the supply voltage line close to the
V
CC pin for bypassing.
Low-Cost, Fail-Safe Temperature Monitor
The MAX6505/MAX6506 provide two outputs that can be
used for fail-safe temperature applications (Figure 3). For
example, the first output can activate a fan when the die
temperature exceeds a certain preset temperature. The
second output asserts at a higher temperature that could
be caused by a wide variety of destructive fault condi-
tions, including latchup, short circuit, and cooling system
failure. This output can be used to initiate such actions
as shutdown of the entire system (see Typical Operating
Circuits).
The high-level integration, low cost, and small size of the
MAX6505–MAX6508 facilitate the use of multiple temper-
ature monitors to increase system reliability.