MAX6575H MAXIM [Maxim Integrated Products], MAX6575H Datasheet - Page 6

• Manufacturer Part Number: MAX6575H
• Description: SOT Temperature Sensor with Multidrop Single-Wire Digital Interface
• Manufacturer: MAXIM [Maxim Integrated Products]

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.
SOT Temperature Sensor with
Multidrop Single-Wire Digital Interface
Figure 2. Interfacing Multiple Devices with a Microcontroller
6
_______________________________________________________________________________________
40 s/°K
TS1
TS0
Interfacing Multiple Devices
+2.7V TO +5.5V
MAX6575L
GND
V
DD
with a Microcontroller
I/O
T1
0.1 F
80 s/°K
CLOSED: T2
OPEN: T1
TS1
TS0
+2.7V TO +5.5V
MAX6575L
GND
V
DD
V
CC
10k
10k
I/O
T2
P3.7
P3.5
0.1 F
8051
GND
V
CC
P1.0
P1.1
P1.2
P1.3
P1.4
P1.5
P1.6
P1.7
X1
X2
470 (8)
12MHz
22pF
22pF