DS1922E-F5- MAXIM [Maxim Integrated Products], DS1922E-F5- Datasheet - Page 24

• Manufacturer Part Number: DS1922E-F5-
• Description: High-Temperature Logger iButton with 8KB
• Manufacturer: MAXIM [Maxim Integrated Products]

High-Temperature Logger iButton with 8KB
Data-Log Memory
Figure 9a. Memory/Control Function Flowchart
24
SCRATCHPAD
INCREMENTS
______________________________________________________________________________________
DS1922E
OFFSET
N
Y
Y
CONTROL FUNCTION COMMAND
SCRATCHPAD OFFSET = [T4:T0]
COMMAND, ADDRESS DATA
TO SCRATCHPAD OFFSET
MASTER Tx MEMORY OR
DS1922E SETS [E4:E0] =
MASTER Tx DATA BYTE
MASTER Rx CRC-16 OF
SCRATCHPAD OFFSET
WRITE SCRATCHPAD?
AND CLEARS (PF, AA)
MASTER Tx RESET?
MASTER Tx RESET?
MASTER Tx RESET?
OFFSET = 11111b?
MASTER Rx "1"s
DS1922E SETS
SCRATCHPAD
TA2 [T15:T8]
MASTER Tx
TA1 [T7:T0]
MASTER Tx
0Fh
Y
N
Y
N
N
BYTE WRITTEN?
N
Y
PARTIAL
N
FLOWCHART (FIGURE 11)
FROM ROM FUNCTIONS
Y
PF = 1
SCRATCHPAD
INCREMENTS
DS1922E
OFFSET
N
Y
SCRATCHPAD OFFSET = [T4:T0]
E/S BYTE, AND DATA STARTING
MASTER Rx DATA BYTE FROM
FLOWCHART (FIGURE 11)
COMMAND, ADDRESS DATA,
MASTER Rx ENDING OFFSET
AT THE TARGET ADDRESS
TO ROM FUNCTIONS
MASTER Rx CRC-16 OF
SCRATCHPAD OFFSET
READ SCRATCHPAD?
WITH DATA STATUS
MASTER Tx RESET?
MASTER Tx RESET?
OFFSET = 11111b?
MASTER Rx "1"s
DS1922E SETS
SCRATCHPAD
TA2 [T15:T8]
MASTER Rx
TA1 [T7:T0]
MASTER Rx
(E/S)
AAh
Y
N
Y
N
N
Y
MASTER Rx "1"s
N
N
DS1922E COPIES SCRATCHPAD
TA1 [T7:T0], TA2 [T15:T8]
64 BITS [PASSWORD]
COPY SCRATCHPAD
MASTER Tx RESET?
MASTER Tx RESET?
DATA TO MEMORY
AUTHORIZATION
CODE MATCH?
DS1922E Tx "0"
DS1922E Tx "1"
PASSWORD
ACCEPTED?
MASTER Tx
MASTER Tx
MASTER Tx
[WITH PW]
E/S BYTE
COPYING
FINISHED
AA = 1
99h
Y
Y
Y
Y
N
Y
N
N
N
Y
MASTER Tx RESET?
MASTER Rx "1"s
AUTHORIZATION
CODE
Y
FROM FIGURE 9b
TO FIGURE 9b
N