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DS2417 Schematic ( PDF Datasheet ) - Maxim Integrated

Teilenummer DS2417
Beschreibung 1-Wire Time Chip
Hersteller Maxim Integrated
Logo Maxim Integrated Logo 




Gesamt 15 Seiten
DS2417 Datasheet, Funktion
DS2417
1-Wire Time Chip with Interrupt
FEATURES
Real-time clock (RTC) with fully compatible
1-Wire® MicroLAN interface
Uses the same binary time/date representation
as the DS2404 but with 1 second resolution
Clock accuracy ±2 minutes per month
at 25°C
Programmable interrupt output for system
wakeup
Communicates at 16.3kbits per second
Unique, factory-lasered and tested 64-bit reg-
istration number (8-bit family code + 48-bit
serial number + 8-bit CRC tester) assures ab-
solute traceability because no two parts are
alike
8-bit family code specifies device communi-
cation requirements to bus master
Built-in multidrop controller ensures com-
patibility with other MicroLAN products
Operates over a wide VDD voltage range of
2.5V to 5.5V from -40°C to +85°C
Low power, 200nA typically with oscillator
running
Compact, low cost 6-pin TSOC and Flip-Chip
surface mount package
PIN ASSIGNMENT
16
25
34
TSOC 150 mil
Top view
65 4
DS2417
rrd#xx
12 3
Flip Chip, Top View
with Laser Mark,
Contacts Not Visible.
“rrd” = Revision/Date
#xx = Lot Number
PIN DESCRIPTION
Pin 1 GND
Pin 2 1-Wire
Pin 3
INT
Pin 4
VDD
Pin 5 X1
Pin 6 X2
ORDERING INFORMATION
DS2417P
6-pin TSOC package
DS2417P/T&R TSOC Package, Tape & Reel
DS2417P+
6-pin TSOC Package
DS2417P+T&R TSOC Package, Tape & Reel
DS2417X
Flip-Chip, 10k Tape & Reel
+ Denotes a lead(Pb)-free/RoHS-compliant package.
DESCRIPTION
The DS2417 1-Wire Time Chip with Interrupt offers a simple solution for storing and retrieving vital time
information with minimal hardware. The DS2417 contains a unique lasered ROM and a real-time
clock/calendar implemented as a binary counter. Only one pin is required for communication with the
device. Utilizing a backup energy source, the data is nonvolatile and allows for stand-alone operation. The
DS2417 features can be used to add functions such as calendar, time and date stamp, and logbook to any type
of electronic device or embedded application that uses a microcontroller.
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19-8222; Rev 2; 3/16






DS2417 Datasheet, Funktion
CLOCK FUNCTION COMMAND FLOW CHART Figure 5
Master TX Control
Function Command
66H
Read Clock
?
Y
N
DS2417 copies
RTC Counter
to R/W Buffer
99H
Write Clock
?
Y
N
Bus Master TX
Device Control Byte
Bus Master RX
Device Control Byte
Bus Master TX
LS Byte (7:0)
Bus Master RX
LS Byte (7:0)
Bus Master TX
next Byte (15:8)
Bus Master RX
next Byte (15:8)
Bus Master RX
next Byte (23:16)
Bus Master RX
MS Byte (31:24)
Bus Master TX
next Byte (23:16)
Bus Master TX
MS Byte (31:24)
N Bus Master
TX Reset
?
Y
N Bus Master
TX Reset
?
Y
DS2417
N Bus Master
TX Reset
?
Y
DS2417 copies
R/W Buffer
to RTC Counter
DS2417 TX
Presence Pulse
Page 6 of 15

6 Page









DS2417 pdf, datenblatt
READ/WRITE TIMING DIAGRAM (continued) Figure 9
Read-data Time Slot
VPULLUP
VPULLUP MIN
VIH MIN
VIL MAX
tSLOT
Master
Sampling Window
tREC
0V
tSU
tLOWR
tRDV
RESISTOR
tRELEASE
60 µs tSLOT < 120 µs
1 µs tLOWR < 15 µs
0 tRELEASE < 45 µs
MASTER
DS2417
1 µs tREC <
tRDV = 15 µs
tSU < 1 µs
CRYSTAL PLACEMENT ON PCB Figure 10
LOCAL GROUND
PLANE BENEATH
SIGNAL PLANE
OR ON OTHER
SIDE OF PCB
GND
1-Wire
INT\
X1
X2
VDD
CRYSTAL
PADS
GUARD RING
ON SIGNAL
PLANE
DS2417
Page 12 of 15

12 Page





SeitenGesamt 15 Seiten
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