fXtal Nominal " />
參數(shù)資料
型號: XE8805AMI028LF
廠商: Semtech
文件頁數(shù): 100/156頁
文件大?。?/td> 0K
描述: IC DAS 16BIT FLASH 8K MTP 64LQFP
標準包裝: 160
系列: XE880x
應用: 感測機
核心處理器: Coolrisc816?
程序存儲器類型: 閃存(22 kB)
控制器系列: XE8000
RAM 容量: 512 x 8
接口: UART,USRT
輸入/輸出數(shù): 24
電源電壓: 2.4 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-LQFP
包裝: 托盤
供應商設備封裝: 64-LQFP(10x10)
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2006
www.semtech.com
7-7
XE8805/05A
Symbol
Description
Min
Typ
Max
Unit
Comments
fXtal
Nominal frequency
32768
Hz
St_xtal
Start-up time
1
2
s
Fstab
Frequency deviation
-100
300
ppm
Note 1
Table 7-10. Crystal oscillator characteristics.
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
External clock
7.5.3.1
External clock configuration
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
External clock specification
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.
Symbol
Description
Min
Typ
Max
Unit
Comments
FEXT
External
clock
frequency
2
MHz
PW_1
Pulse 1 width
0.2
s
PW_0
Pulse 0 width
0.2
s
Table 7-11. External clock specifications.
Not
Recommended
for
New
Designs
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