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DS1923
iButton Hygrochron Temperature/Humidity
Logger with 8KB Data-Log Memory
MASTER Tx MEMORY OR
CONTROL FUNCTION COMMAND
FROM ROM FUNCTIONS
FLOWCHART (FIGURE 11)
0Fh
WRITE SCRATCHPAD?
N
AAh
READ SCRATCHPAD?
N
99h
COPY SCRATCHPAD
N
TO FIGURE 9b
[WITH PW]
Y
MASTER Tx
TA1 [T7:T0]
MASTER Tx
TA2 [T15:T8]
DS1923 SETS
SCRATCHPAD OFFSET = [T4:T0]
AND CLEARS (PF, AA)
Y
MASTER Rx
TA1 [T7:T0]
MASTER Rx
TA2 [T15:T8]
MASTER Rx ENDING OFFSET
WITH DATA STATUS
(E/S)
Y
MASTER Tx
TA1 [T7:T0], TA2 [T15:T8]
MASTER Tx
E/S BYTE
MASTER Tx
64 BITS [PASSWORD]
AUTHORIZATION
CODE
MASTER Tx DATA BYTE
TO SCRATCHPAD OFFSET
DS1923 SETS
SCRATCHPAD OFFSET = [T4:T0]
PASSWORD
ACCEPTED?
N
Y
DS1923
DS1923 SETS [E4:E0] =
DS1923
MASTER Rx DATA BYTE FROM
INCREMENTS
SCRATCHPAD
OFFSET
SCRATCHPAD OFFSET
MASTER Tx RESET?
Y
INCREMENTS
SCRATCHPAD
OFFSET
SCRATCHPAD OFFSET
MASTER Tx RESET?
Y
AUTHORIZATION
CODE MATCH?
Y
N
AA = 1
N
N
DS1923 COPIES SCRATCHPAD
N
SCRATCHPAD
N
SCRATCHPAD
DATA TO MEMORY
OFFSET = 11111b?
OFFSET = 11111b?
Y
PARTIAL
BYTE WRITTEN?
Y
Y
MASTER Rx "1"s
MASTER Rx "1"s
Y
MASTER Tx RESET?
N
MASTER Rx CRC-16 OF
COMMAND, ADDRESS DATA,
E/S BYTE, AND DATA STARTING
AT THE TARGET ADDRESS
N
COPYING
FINISHED
Y
MASTER Tx RESET?
N
N
MASTER Rx CRC-16 OF
PF = 1
DS1923 Tx "0"
Y
COMMAND, ADDRESS DATA
Y
MASTER Tx RESET?
N
MASTER Tx RESET?
Y
Y
MASTER Tx RESET?
N
MASTER Rx "1"s
N
DS1923 Tx "1"
MASTER Rx "1"s
N
MASTER Tx RESET?
Y
FROM FIGURE 9b
TO ROM FUNCTIONS
FLOWCHART (FIGURE 11)
Figure 9a. Memory/Control Function Flowchart
Maxim Integrated
31
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