Rainbow-electronics DS2411 Manual do Utilizador descarregar pdf (Página 5)

DS2411

5 of 11

Figure 2. 1-WIRE CRC GENERATOR

POLYNOMIAL = X

+ X

+ 1

1st

STAGE

2nd

STAGE

3rd

STAGE

4th

STAGE

6th

STAGE

5th

STAGE

7th

STAGE

8th

STAGE

INPUT DATA

Figure 3. DS2411 EQUIVALENT CIRCUIT

100 Ω

MOSFE

I/O

-1

GROUND

Figure 4. BUS MASTER CIRCUIT

a) Open Drain b) DS2480B Serial Bridge

OPEN-DRAIN

PORT PIN

BUS MASTER

DS5000 OR 8051

EQUIVALENT

to DS2411

PUP

I/O to DS2411

Ground to DS2411

PUP

must be between 0.3 k

and 2.2 k

. The optimal

value depends on the 1-Wire communication speed and

the bus load characteristics.

SIN (RxD)

SOUT (TxD)

UART

OR µC

START

STOP

* ONLY ONE DS9502 ESD PROTECTION DIODE WITH 5V

5V OPERATION ONLY

GND

1-W

POL

RxD

TxD

DS2480

I/O

1 2 3 4 5 6 7 8 9 10 11

SOT23-3, Top View 1
ABSOLUTE MAXIMUM RATINGS* 2
ELECTRICAL CHARACTERISTICS (V 2
= 1.5V to 5.25V; T 2
= -40°C to +85°C.) 2
OPERATION 4
1-Wire BUS SYSTEM 4
Hardware Configuration 4
Figure 4. BUS MASTER CIRCUIT 5
1-WIRE SIGNALING 8
Read/Write Time Slots 8
Master to Slave 8
SAMPLING 9
Slave to Master 10
Improved Network Behavior 10
CRC GENERATION 11
CUSTOM DS2411 11

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