Intel C2550 FH8065401488912 Ficha De Dados
Códigos do produto
FH8065401488912
Volume 3—Signal Electrical and Timing Characteristics—C2000 Product Family
SoC Real-Time Clock (RTC) Interface
Intel
®
Atom™ Processor C2000 Product Family for Microserver
Datasheet, Vol. 3 of 3
September 2014
680
Order Number: 330061-002US
33.20.2
RTC Crystal Specifications
contains the requirements for the RTC crystal.
• BRTCX1_PAD
• BRTCX2_PAD
• BRTCX2_PAD
Notes:
1.
These are the specifications needed to select a crystal oscillator for the RTC circuit.
2.
Crystal tolerance impacts RTC time. A 10 ppm crystal is recommended for 1.7 seconds tolerance per
day, RTC circuit itself contributes addition 10 ppm for a total of 20 ppm in this example.
33.20.3
Interface Timing Parameters and Waveforms
The RTC interface signals, their state exchange and timing with the platform board
design are in
Table 33-42. RTC Crystal Requirements
Parameter
Min
Typ
Max
Unit
Note
Frequency
–
32.768
–
kHz
1
Cut
–
AT
–
n/a
1
Loading
–
Parallel
–
n/a
1
Load Capacity (C)
–
–
20
pF
1
Drive Strength
–
–
100
W
1
Shunt Capacity
–
0.5
1.0
pf
1
Series Resistance
–
–
80
Ω
1
Cut Accuracy Maximum
–
±25
–
ppm
1, 2
Temperature Stability Maximum (0-50°C)
–
±20
–
ppm
1, 2
Aging Maximum
–
±5
–
ppm
1, 2