1024-Bit, 1-Wire EEPROM
for Automotive Applications
FROM FIGURE 7
1ST PART
55h
F0h
N
N
COPY SCRATCHPAD?
READ MEMORY?
Y
Y
APPLICABLE TO ALL R/W
MEMORY LOCATIONS.
BUS MASTER Tx
TA1 (T7:T0), TA2 (T15:T8)
AND E/S BYTE
BUS MASTER Tx
TA1 (T7:T0), TA2 (T15:T8)
DS243-A1
Y
ADDRESS < 90h?
N
Y
Y
AUTH. CODE
MATCH?
T15:T0 < 0090h?
DS2431-A1 SETS MEMORY
ADDRESS = (T15:T0)
N
N
N
PF = 0?
Y
DS2431-A1
INCREMENTS
ADDRESS
BUS MASTER Rx
DATA BYTE FROM
MEMORY ADDRESS
COUNTER
Y
COPY PROTECTED?
Y
BUS MASTER
Rx "1"s
MASTER Tx RESET?
N
N
AA = 1
N
MASTER Tx RESET?
Y
Y
ADDRESS < 8Fh?
N
DS2431-A1 COPIES
SCRATCHPAD
DATA TO ADDRESS
DURATION: t
*
PROG
BUS MASTER
Rx "1"s
N
DS2431 Tx "0"
BUS MASTER
Rx "1"s
MASTER Tx RESET?
Y
N
Y
MASTER Tx RESET?
Y
MASTER Tx RESET?
N
DS2431 Tx "1"
N
MASTER Tx RESET?
Y
FROM FIGURE 7
1ST PART
* 1-Wire IDLE HIGH FOR POWER
Figure 7. Memory Function Flow Chart (continued)
10 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
