Datasheet

DS2431
1024-Bit, 1-Wire EEPROM
14 ______________________________________________________________________________________
DS2431 Tx
PRESENCE PULSE
BUS MASTER Tx
RESET PULSE
BUS MASTER Tx ROM
FUNCTION COMMAND
DS2431 Tx
CRC BYTE
DS2431 Tx
FAMILY CODE
(1 BYTE)
DS2431 Tx
SERIAL NUMBER
(6 BYTES)
RC = 0
MASTER Tx BIT 0
RC = 0 RC = 0 RC = 0
OD = 0
YY
Y
Y
Y
Y
Y
Y
33h
READ ROM
COMMAND?
N
55h
MATCH ROM
COMMAND?
BIT 0 MATCH? BIT 0 MATCH?
N
N N
N N
N N
F0h
SEARCH ROM
COMMAND?
OD
RESET PULSE?
N
N
CCh
SKIP ROM
COMMAND?
N
RC = 1
MASTER Tx BIT 1
MASTER Tx BIT 63
BIT 1 MATCH?
BIT 63 MATCH?
Y
Y
RC = 1
FROM MEMORY FUNCTIONS
FLOWCHART (FIGURE 7)
TO MEMORY FUNCTIONS
FLOWCHART (FIGURE 7)
DS2431 Tx BIT 0
DS2431 Tx BIT 0
MASTER Tx BIT 0
BIT 1 MATCH?
BIT 63 MATCH?
DS2431 Tx BIT 1
DS2431 Tx BIT 1
MASTER Tx BIT 1
DS2431 Tx BIT 63
DS2431 Tx BIT 63
MASTER Tx BIT 63
Y
TO FIGURE 9b
TO FIGURE 9b
FROM FIGURE 9b
FROM FIGURE 9b
Figure 9a. ROM Functions Flowchart