1024-Bit, 1-Wire EEPROM
for Automotive Applications
DS243-A1
BUS MASTER Tx
RESET PULSE
FROM FIGURE 9, 2ND PART
FROM MEMORY FUNCTIONS
FLOW CHART (FIGURE 7)
OD
N
OD = 0
RESET PULSE?
Y
BUS MASTER Tx ROM
DS2431-A1 Tx
FUNCTION COMMAND
PRESENCE PULSE
TO FIGURE 9
2ND PART
33h
READ ROM
COMMAND?
55h
MATCH ROM
COMMAND?
F0h
SEARCH ROM
COMMAND?
CCh
SKIP ROM
COMMAND?
N
N
N
N
Y
Y
Y
Y
RC = 0
RC = 0
RC = 0
RC = 0
DS2431-A1 Tx BIT 0
DS2431-A1 Tx BIT 0
MASTER Tx BIT 0
DS2431-A1 Tx
FAMILY CODE
(1 BYTE)
MASTER Tx BIT 0
N
N
N
N
N
N
BIT 0 MATCH?
BIT 0 MATCH?
Y
Y
DS2431-A1 Tx BIT 1
DS2431-A1 Tx BIT 1
MASTER Tx BIT 1
DS2431-A1 Tx
SERIAL NUMBER
(6 BYTES)
MASTER Tx BIT 1
BIT 1 MATCH?
Y
BIT 1 MATCH?
Y
DS2431-A1 Tx BIT 63
DS2431-A1 Tx BIT 63
MASTER Tx BIT 63
DS2431-A1 Tx
CRC BYTE
MASTER Tx BIT 63
BIT 63 MATCH?
BIT 63 MATCH?
Y
Y
TO FIGURE 9
2ND PART
RC = 1
RC = 1
FROM FIGURE 9
2ND PART
TO MEMORY FUNCTIONS
FLOW CHART (FIGURE 7)
Figure 9. ROM Functions Flow Chart
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
