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SOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
+2.7V TO +5.5V
+2.7V TO +5.5V
V DD
0.1 μ F
V DD
0.1 μ F
40 μ s/°K
TS1
TS0
MAX6575L
I/O
T1
80 μ s/°K
TS1
TS0
MAX6575L
I/O
T2
GND
GND
V CC
470 ? (8)
10k
P1.0
P1.1
OPEN: T1
CLOSED: T2
V CC
10k
P3.7
P3.5
8051
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
X1
22pF
12MHz
Figure 2. Interfacing Multiple Devices with a Microcontroller
Interfacing Multiple Devices
with a Microcontroller
Figure 2 shows how to interface multiple MAX6575L/H
devices with an 8051 microcontroller. The first device,
T1, is configured for a timeout multiplier of 40μs/°K,
while the second device, T2, is configured for a timeout
multiplier of 80μs/°K to avoid overlap. The microcon-
troller takes in temperature values from both sensors,
T1 and T2, on a single port pin, P3.7. The microcon-
troller displays five times the temperature in degrees
Celsius in binary on Port 1. A switch connected to a
pull-up resistor at Port 3.5 selects which temperature is
displayed: open = T1, closed = T2. Code is provided
for this application as Listing 1.
GND
X2
22pF
6
_______________________________________________________________________________________
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