DS1923
iButton Hygrochron Temperature/Humidity
Logger with 8KB Data-Log Memory
TO FIGURE 11a
FROM FIGURE 11a
CCh
SKIP ROM
N
A5h
RESUME
N
3Ch
OVERDRIVE-
N
69h
OVERDRIVE-
N
COMMAND?
Y
RC = 0
COMMAND?
Y
RC = 1?
N
SKIP ROM?
Y
RC = 0; OD = 1
MATCH ROM?
Y
RC = 0; OD = 1
Y
MASTER Tx
Y
MASTER Tx BIT 0
RESET?
N
(SEE NOTE)
MASTER Tx
RESET?
Y
BIT 0 MATCH?
N
OD = 0
N
Y
MASTER Tx BIT 1
(SEE NOTE)
BIT 1 MATCH?
N
OD = 0
Y
MASTER Tx BIT 63
(SEE NOTE)
FROM FIGURE 11a
BIT 63 MATCH?
Y
RC = 1
N
OD = 0
TO FIGURE 11a
NOTE: THE OD FLAG REMAINS AT 1 IF THE DEVICE WAS ALREADY AT OVERDRIVE SPEED BEFORE THE OVERDRIVE-MATCH ROM COMMAND WAS ISSUED.
Figure 11b. ROM Functions Flowchart (continued)
40
Maxim Integrated
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