cs5535 National Semiconductor Corporation, cs5535 Datasheet - Page 145
cs5535
Manufacturer Part Number
cs5535
Description
Geode Cs5535 Companion Multi-function South Bridge
Manufacturer
National Semiconductor Corporation
Datasheet
1.CS5535.pdf
(555 pages)
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Revision 0.8
RTC Functional Description
4.14.1 External Use Recommendations
It is recommended that the external components for the
oscillator be connected as illustrated in Figure 4-48. The
recommended specifications for those external compo-
nents are listed in Table 4-29.
Capacitors C1 and C2 should be chosen to match the crys-
tal’s load capacitance. The load capacitance C
the crystal Y is comprised of C1 in series with C2 in parallel
with the parasitic capacitance of the circuit. The parasitic
capacitance is caused by the chip package, board layout,
and socket (if any). The rule of thumb in choosing these
capacitors is:
C1 can be trimmed to achieve precisely 32.768 kHz. To
achieve high time accuracy, use crystal and capacitors with
low tolerance and temperature coefficients.
Note 1. A single 20 MΩ resistor may be difficult to acquire. Substituting two 10 MΩ resistors in series is acceptable.
Component
Crystal
Resistor, R1
Capacitor, C1
Capacitor, C2
C
L
= (C1 * C2)/(C1 + C2) + C
Table 4-29. External Component Recommended Specifications
Parameters
Resonance
Type
Serial Resistance
Q Factor
Shunt Capacitance
Load Capacitance, C
Temperature Coefficient
Resistor
Capacitor
Capacitor
PARASITIC
(Continued)
L
“seen” by
L
145
Values
32.768 kHz Parallel Mode
N-Cut or XY-bar
40 kΩ
35000
2 pF
9-13 pF
User-defined
20 MΩ (Note 1)
22 pF
22 pF
Figure 4-48. Recommended External Component
KHZ32_XCI
C1
R1
Y
Connections
Tolerance
User-defined
Max
Min
Max
5%
5%
5%
KHZ32_XCO
C2
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