参数资料
型号: XE8806AMI026TLF
厂商: Semtech
文件页数: 85/143页
文件大小: 0K
描述: IC MCU LOW PWR MTP FLASH 32-TQFP
标准包装: 1
系列: XE880x
应用: 感测机
核心处理器: Coolrisc816?
程序存储器类型: 闪存(22 kB)
控制器系列: XE8000
RAM 容量: 512 x 8
接口: UART,USRT
输入/输出数: 24
电源电压: 2.4 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-TQFP
包装: 剪切带 (CT)
供应商设备封装: 32-TQFP(7x7)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名称: XE8806AMI026CT
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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XE8807AMI026TLF 功能描述:IC MCU LOW PWR MTP FLASH 32-TQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器 - 特定应用 系列:XE880x 产品变化通告:Product Discontinuation 26/Aug/2009 标准包装:250 系列:- 应用:网络处理器 核心处理器:4Kc 程序存储器类型:- 控制器系列:- RAM 容量:16K x 8 接口:以太网,UART,USB 输入/输出数:- 电源电压:1.8V, 3.3V 工作温度:- 安装类型:表面贴装 封装/外壳:208-LQFP 包装:带卷 (TR) 供应商设备封装:PG-LQFP-208 其它名称:SP000314382