參數(shù)資料
型號(hào)： XE8807AMI026TLF
廠商： Semtech
文件頁數(shù)： 85/143頁
文件大?。?/td> 0K
描述： IC MCU LOW PWR MTP FLASH 32-TQFP
標(biāo)準(zhǔn)包裝： 1
系列： XE880x
應(yīng)用： 感測機(jī)
核心處理器： Coolrisc816?
程序存儲(chǔ)器類型： 閃存（11 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： 32-TQFP
包裝： 標(biāo)準(zhǔn)包裝
供應(yīng)商設(shè)備封裝： 32-TQFP（7x7）
產(chǎn)品目錄頁面： 585 (CN2011-ZH PDF)
配用： XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名稱： XE8807AMI026DKR
Semtech 2006
www.semtech.com
7-7
XE8806A/XE8807A
7.7
Xtal oscillator
7.7.1
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, a pad NRESET pulse 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.
7.7.2
Xtal oscillator specifications
The crystal oscillator has been designed for a crystal with the specifications given in Table 7-9. The oscillator
precision can only be guaranteed for this crystal.
Symbol
Description
Min
Typ
Max
Unit
Comments
Fs
Resonance frequency
32768
Hz
CL
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 7-9. Crystal specifications.
For safe operation, low power consumption and to meet the specified precision, careful board layout is required:
Keep lines XIN and XOUT short and insert a VSS line in between them.
Connect the crystal package to VSS.
No noisy or digital lines near XIN or XOUT.
Insert guards where needed.
Respect the board specifications of Table 7-10.
Symbol
Description
Min
Typ
Max
Unit
Comments
Rh_xin
Resistance XIN-VSS
10
M
Rh_xout
Resistance XOUT-
VSS
10
M
Rh_xin_xout
Resistance XIN-
XOUT
50
M
Cp_xin
Capacitance XIN-
VSS
0.5
3.0
pF
Cp_xout
Capacitance XOUT-
VSS
0.5
3.0
pF
Cp_xin_xout
Capacitance XIN-
XOUT
0.2
1.0
pF
Table 7-10. Board layout specifications.
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