Datasheet

DS2431-A1
1024-Bit, 1-Wire EEPROM
for Automotive Applications
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DS2431-A1 Tx
PRESENCE PULSE
BUS MASTER Tx
RESET PULSE
BUS MASTER Tx ROM
FUNCTION COMMAND
DS2431-A1 Tx
CRC BYTE
DS2431-A1 Tx
FAMILY CODE
(1 BYTE)
DS2431-A1 Tx
SERIAL NUMBER
(6 BYTES)
RC = 0
MASTER Tx BIT 0
RC = 0 RC = 0 RC = 0
YYY
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?
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
FLOW CHART (FIGURE 7)
TO MEMORY FUNCTIONS
FLOW CHART (FIGURE 7)
DS2431-A1 Tx BIT 0
DS2431-A1 Tx BIT 0
MASTER Tx BIT 0
BIT 1 MATCH?
BIT 63 MATCH?
DS2431-A1 Tx BIT 1
DS2431-A1 Tx BIT 1
MASTER Tx BIT 1
DS2431-A1 Tx BIT 63
DS2431-A1 Tx BIT 63
MASTER Tx BIT 63
Y
RC = 1?
Y
A5h
RESUME
COMMAND?
N
N
Y
Y
MASTER Tx
RESET?
N
Figure 9. ROM Functions Flow Chart