XE8000EV101 Semtech, XE8000EV101 Datasheet - Page 47

• Manufacturer Part Number: XE8000EV101
• Description: EVAL BOARD FOR XE8801AMI027LF
• Manufacturer: Semtech
• Type: MCUr

Specifications of XE8000EV101

• Contents: Fully Assembled Evaluation Board
• For Use With/related Products: XE88LC01AMI027
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The oscillator characteristics are given in Table 7-10. The characteristics are valid only if the crystal and board
layout meet the specifications above.
Note 1. This gives the relative frequency deviation from nominal for a crystal with CL=8.2pF and within the
temperature range -40°C to 85°C. The crystal tolerance, crystal aging and crystal temperature drift are not included
in this figure.
7.5.3
7.5.3.1
The user can provide an external clock instead of the internal oscillators. Only the CPU can use the external clock.
The external clock input pin is OSCIN.
The system is configured for external clock by bit EnExtClock in register RegSysClock.
When EnExtClock is set to 1, the external clock is detected after 4 pulses on pin OSCIN. The ExtClk bit shows
when the external clock is available.
Note: when using the external clock, the Xtal is not available.
7.5.3.2
The external clock has to satisfy the specifications in the table below. Correct behavior of the circuit can not be
guaranteed if the external clock signal does not respect the specifications below.
© Semtech 2005
Symbol
Rh_oscin
Rh_oscout
Rh_
Cp_oscin
Cp_oscout
Cp_
Symbol
f
St_xtal
Fstab
Symbol
F
PW_1
PW_0
Xtal
EXT
External clock
External clock configuration
External clock specification
oscin_oscout
oscin_oscout
Description
Resistance OSCIN-VSS
Resistance OSCOUT-VSS
Resistance OSCIN-OSCOUT
Capacitance OSCIN-VSS
Capacitance OSCOUT-VSS
Capacitance OSCIN-OSCOUT
Description
Nominal frequency
Start-up time
Frequency deviation
Description
External
frequency
Pulse 1 width
Pulse 0 width
Table 7-10. Crystal oscillator characteristics.
Table 7-11. External clock specifications.
Table 7-9. Board layout specifications.
clock
-100
Min
Min
Min
0.5
0.5
0.2
0.2
0.2
10
10
50
7-7
32768
Typ
Typ
Typ
1
Max
Max
Max
300
3.0
3.0
1.0
2
2
Unit
MΩ
MΩ
MΩ
pF
pF
pF
Unit
Hz
s
ppm
Unit
MHz
µs
µs
XE8801A – SX8801R
Comments
Comments
Note 1
Comments
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