XE8805 SEMTECH [Semtech Corporation], XE8805 Datasheet - Page 48
XE8805
Manufacturer Part Number
XE8805
Description
Data Acquisition MCU
Manufacturer
SEMTECH [Semtech Corporation]
Datasheet
1.XE8805.pdf
(156 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
XE8805AMI028LF
Manufacturer:
SEMTECH/美国升特
Quantity:
20 000
- Current page: 48 of 156
- Download datasheet (2Mb)
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 2006
Symbol
f
St_xtal
Fstab
Symbol
F
PW_1
PW_0
Xtal
EXT
External clock
External clock configuration
External clock specification
Description
Nominal frequency
Start-up time
Frequency deviation
Description
External
frequency
Pulse 1 width
Pulse 0 width
clock
Table 7-10. Crystal oscillator characteristics.
Table 7-11. External clock specifications.
-100
Min
Min
0.2
0.2
32768
Typ
Typ
1
7-7
Max
Max
300
2
2
Unit
Hz
s
ppm
Unit
MHz
µs
µs
Comments
Note 1
Comments
XE8805/05A
www.semtech.com
Related parts for XE8805
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
HIGH VOLTAGE CAPACITORS MONOLITHIC CERAMIC TYPE
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
EZ1084CM5.0 AMP POSITIVE VOLTAGE REGULATOR
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
3.0 AMP LOW DROPOUT POSITIVE VOLTAGE REGULATORS
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
RailClamp Low Capacitance TVS Diode Array
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet:
Part Number:
Description:
Manufacturer:
Semtech Corporation
Datasheet: