DS2431-A1 Maxim, DS2431-A1 Datasheet - Page 9

• Manufacturer Part Number: DS2431-A1
• Description: The DS2431-A1 is an AEC-Q100 Grade 1 qualified version of the DS2431
• Manufacturer: Maxim

Figure 7. Memory Function Flow Chart
INCREMENTS
BUS MASTER
DS2431-A1
Rx "1"s
E2:E0
_______________________________________________________________________________________
N
N
BUS MASTER Tx MEMORY
DS2431-A1 Tx CRC-16 OF
TA1 (T7:T0), TA2 (T15:T8)
WERE SENT BY THE BUS
MASTER Tx DATA BYTE
FUNCTION COMMAND
COMMAND, ADDRESS,
WRITE SCRATCHPAD?
DATA BYTES AS THEY
MASTER Tx RESET?
MASTER Tx RESET?
SETS E2:E0 = T2:T0
TO SCRATCHPAD
DS2431-A1 SETS
BUS MASTER Tx
CLEARS AA = 0
SETS PF = 1
E2:E0 = 7?
T2:T0 = 0?
MASTER
PF = 0
0Fh
FLOW CHART (FIGURE 9)
TO ROM FUNCTIONS
Y
N
Y
Y
Y
N
Y
N
APPLIES ONLY
IF THE MEMORY
AREA IS NOT
PROTECTED.
IF WRITE PROTECTED,
THE DS2431-A1
COPIES THE DATE
BYTE FROM THE
TARGET ADDRESS
INTO THE SP.
IF IN EPROM MODE,
THE DS2431-A1
LOADS THE BITWISE
LOGICAL AND,
THE TRANSMITTED
BYTE, AND THE
DATA BYTE FROM
THE TARGETED
ADDRESS INTO
THE SP.
FLOW CHART (FIGURE 9)
FROM ROM FUNCTIONS
for Automotive Applications
1024-Bit, 1-Wire EEPROM
BYTE COUNTER
INCREMENTS
BUS MASTER
DS2431-A1
Rx "1"s
N
N
AS SENT BY THE DS2431-A1
OF COMMAND, ADDRESS,
TA1 (T7:T0), TA2 (T15:T8),
BUS MASTER Rx CRC-16
BYTE COUNTER = T2:T0
E/S BYTE, DATA BYTES
READ SCRATCHPAD?
MASTER Tx RESET?
MASTER Tx RESET?
DATA BYTE FROM
DS2431-A1 SETS
BUS MASTER Rx
BUS MASTER Rx
BYTE COUNTER
AND E/S BYTE
SCRATCHPAD
SCRATCHPAD
= E2:E0?
AAh
Y
N
Y
Y
N
Y
TO FIGURE 7
TO FIGURE 7
2ND PART
2ND PART
9