參數資料
型號： XE8801AMI027LF
廠商： Semtech
文件頁數： 77/135頁
文件大?。?/td> 0K
描述： IC DAS 16BIT FLASH 8K MTP 44LQFP
標準包裝： 800
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： 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： 44-VFQFN 裸露焊盤
包裝： 托盤
供應商設備封裝： 44-MLPQ（7x7）
產品目錄頁面： 585 (CN2011-ZH PDF)
配用： XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2005
www.semtech.com
7-6
XE8801A – SX8801R
The tolerances on the minimal frequency and the drift with supply or temperature can be cancelled using the
software DFLL (digital frequency locked loop) which uses the crystal oscillator as a reference frequency.
7.5.2
Xtal oscillator
7.5.2.1
Xtal configuration
The Xtal operates with an external crystal of 32’768 Hz.
During Xtal oscillator start-up, the first 32768 cycles are masked. The two bits EnableXtal and ColdXtal in register
RegSysClock control the oscillator.
At power-on reset or during sleep mode, EnableXtal is reset and ColdXtal is set (Xtal oscillator is not selected at
start-up). The user can start Xtal oscillator by setting EnableXtal. When the Xtal oscillator starts, bit ColdXtal is
reset after 32768 cycles. Before ColdXtal is reset by the system, the Xtal frequency precision is not guaranteed.
The Xtal oscillator can be stopped by the user by resetting bit EnableXtal.
When the user enters into sleep mode, the Xtal is stopped.
When an external clock is detected (ExtClk = 1) or the EnExtClock is set 1, the EnableXtal bit can not be set to 1.
7.5.2.2
Xtal oscillator specifications
The crystal oscillator has been designed for a crystal with the specifications given in Table 7-8. The oscillator
precision can only be guaranteed for this crystal.
Symbol
Description
Min
Typ
Max
Unit
Comments
Fs
Resonance frequency
32768
Hz
CL
for
nominal
frequency
8.2
15
pF
Rm
Motional resistance
40
100
k
Cm
Motional capacitance
1.8
2.5
3.2
fF
C0
Shunt capacitance
0.7
1.1
2.0
pF
Rmp
Motional resistance of
6
th overtone (parasitic)
4
8
k
Q
Quality factor
30k
50k
400k
-
Table 7-8. Crystal specifications.
For safe operation, low power consumption and to meet the specified precision, careful board layout is required:
Keep lines OSCIN and OSCOUT short and insert a VSS line in between them.
Connect the crystal package to VSS.
No noisy or digital lines near OSCIN or OSCOUT.
Insert guards where needed.
Respect the board specifications of Table 7-9.
Not
Recommended
for
New
Designs
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