Datasheet

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