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DS2417P View Datasheet(PDF) - Maxim Integrated

Part Name
Description
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DS2417P
MaximIC
Maxim Integrated MaximIC
DS2417P Datasheet PDF : 16 Pages
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DS2417
OVERVIEW
The DS2417 has two main data components: 1) 64-bit lasered ROM, and 2) real-time clock counter (Figure
1). The real-time clock utilizes an on-chip oscillator that is connected to an external 32.768kHz crystal. The
hierarchical structure of the 1-Wire protocol is shown in Figure 2. The bus master must first provide one of
four ROM function commands: 1) Read ROM, 2) Match ROM, 3) Search ROM, 4) Skip ROM. The protocol
for these ROM functions is described in Figure 7. After a ROM function command is successfully executed,
the real-time clock functions become accessible and the master may then provide one of the real-time clock
function commands. The protocol for these commands is described in Figure 5. All data is read and written
least significant bit first.
DETAILED PIN DESCRIPTION
PIN SYMBOL DESCRIPTION
1
GND Ground Pin
2
1-Wire Data input/output Open drain.
3
INT
Interrupt pin Open drain.
4
VDD Power input pin. 2.5V to 5.5V.
5, 6 X1, X2 Crystal pins. Connections for a standard 32.768kHz quartz crystal, EPSON part
number C-002RX or C-004R (be sure to request 6pF load capacitance).
NOTE: X1 and X2 are very high impedance nodes. It is recommended that they
and the crystal be guard-ringed with ground and that high frequency signals be
kept away from the crystal area. See Figure 10 and Application Note 58 for de-
tails.
BLOCK DIAGRAM Figure 1
1-WIRE
ROM
FUNCTION
CONTROL
INT
64-BIT
LASERED
ROM
VDD
CLOCK
FUNCTION
INT\
CONTROL
READ/WRITE BUFFER
INT. GENERATOR
RTC COUNTER (32-BIT)
OSCILLATOR
CONTROL
32.768 kHz
OSC./DIVIDER 1 Hz
X1
X2
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