Rainbow Electronics DS2411 - Manual (Page 5)

DS2411
5 of 11
Figure 2. 1-WIRE CRC GENERATOR
X 0 X 1 X 2 X 3 X 4 X 5 X 6 X 7 X 8
POLYNOMIAL = X 8 + X 5 + X 4 + 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
MOSFET
Rx
Tx
V
CC
I/O
-1mA £ I
L
£ 1mA
GROUND
Figure 4. BUS MASTER CIRCUIT
a) Open Drain b) DS2480B Serial Bridge
OPEN-DRAIN
PORT PIN
BUS MASTER
DS5000 OR 8051
EQUIVALENT
V
CC
to DS2411
Rx
Tx
R
PUP
I/O to DS2411
Ground to DS2411
R
PUP
must be between 0.3 kW and 2.2 kW. The optimal
value depends on the 1-Wire communication speed and
the bus load characteristics.
SIN (RxD)
SOUT (TxD)
UART
OR µC
START STOP
1
0
L M
* ONLY ONE DS9502 ESD PROTECTION DIODE WITH 5V
5V
5V OPERATION ONLY
GND
1-W
POL
V
DD
V
PP
RxD
TxD
DS2480 *
V
cc
I/O
GND