DS1904 Maxim, DS1904 Datasheet - Page 5

• Manufacturer Part Number: DS1904
• Description: The DS1904 RTC iButton® is a rugged real-time clock module that can be accessed with minimal hardware
• Manufacturer: Maxim

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