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DS1904 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part # DS1904
Description  Real-Time Clock/calendar in binary format RTC iButton Over 10 years of operation
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

DS1904 Datasheet(HTML) 5 Page - Maxim Integrated Products

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DS1904
5 of 13
CLOCK FUNCTION COMMAND FLOW CHART Figure 5
Master TX Control
Function Command
66H
Read Clock
?
Y
N
Bus Master
TX Reset
?
N
Y
N
Bus Master
TX Reset
?
DS1904 copies
RTC Counter
to R/W Buffer
99H
Write Clock
?
N
Y
Y
N
Bus Master
TX Reset
?
Bus Master TX
LS Byte (7:0)
Bus Master TX
next Byte (15:8)
Bus Master TX
next Byte (23:16)
Bus Master TX
MS Byte (31:24)
Bus Master TX
Device Control Byte
DS1904 copies
R/W Buffer
to RTC Counter
DS1904 TX
Presence Pulse
Bus Master RX
next Byte (15:8)
Bus Master RX
next Byte (23:16)
Bus Master RX
MS Byte (31:24)
Bus Master RX
LS Byte (7:0)
Bus Master RX
Device Control Byte
Y


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