Rainbow-electronics MAX6575H Manual do Utilizador descarregar pdf (Página 6)

MAX6575L/H

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.

SOT Temperature Sensor with

Multidrop Single-Wire Digital Interface

6 _______________________________________________________________________________________

GND

TS0

TS1

I/O I/O

0.1µF

MAX6575L MAX6575L

+2.7V TO +5.5V +2.7V TO +5.5V

GND

P3.7

P3.5

10k

OPEN: T1

CLOSED: T2

470Ω (8)

10k

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7

8051

12MHz

22pF

GND

T2T1

TS0

80µs/°K40µs/°K

TS1

0.1µF

P1.0

Figure 2. Interfacing Multiple Devices with a Microcontroller

1 2 3 4 5 6 7 8 9 10 11 12

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