45300 Parallax Inc, 45300 Datasheet - Page 178
45300
Manufacturer Part Number
45300
Description
BOARD PROTO SX48
Manufacturer
Parallax Inc
Type
MCUr
Specifications of 45300
Contents
Board
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
For Use With/related Products
SX48
For Use With
130-28029 - KIT PARTS SMART SENSORS45111 - MANUAL FOR SX-KEY/BLITZ VER. 2.028850 - CARRIER BOARD BOARD OF EDU USB
Lead Free Status / RoHS Status
Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
453001
Manufacturer:
LITTELFUSE/力特
Quantity:
20 000
Company:
Part Number:
453002
Manufacturer:
LITTELFU
Quantity:
1 000
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15 Appendix E: SX Data Sheet
15.6.1.2
For timing insensitive applications, the RC device option offers additional cost savings. The RC
oscillator frequency is a function of the supply voltage, the resistor (Rext) and capacitor (Cext) values,
and the operating temperature. In addition to this, the oscillator frequency will vary from unit to unit
due to normal process variation. Furthermore, the difference in lead frame capacitance between
package types will also affect the oscillation frequency, especially for low Cext values. Variation due to
tolerance of external R and C components must also be considered.
Figure 40 - External RC Mode shows the RC connections to the SX. For Rext values below 2.2k , the
oscillator operation may become unstable, or stop completely. For very high Rext values (e.g. 1 M ) the
oscillator becomes sensitive to noise, humidity and leakage. The recommended Rext value is 3k
100k .
Although the oscillator will operate with no external capacitor (Cext = 0 pF), using values above 20 pF is
recommended for noise and stability reasons. With little external capacitance, the oscillation frequency
can vary dramatically due to changes in external capacitance, such as PCB trace capacitance or package
lead frame capacitance.
Page 178 SX-Key/Blitz Development System Manual 2.0 Parallax, Inc.
External RC Mode
Clock signal
from external
system
Figure 39 - SX with External System Clock
Vdd
Figure 40 - External RC Mode
Cext
Rext
Not Connected
OSC1
OSC2
OSC1
OSC2
SX
SX
to
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