參數(shù)資料
型號: XE8801AMI027LF
廠商: Semtech
文件頁數(shù): 78/135頁
文件大?。?/td> 0K
描述: IC DAS 16BIT FLASH 8K MTP 44LQFP
標(biāo)準(zhǔn)包裝: 800
系列: XE880x
應(yīng)用: 感測機(jī)
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: 44-VFQFN 裸露焊盤
包裝: 托盤
供應(yīng)商設(shè)備封裝: 44-MLPQ(7x7)
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2005
www.semtech.com
7-7
XE8801A – SX8801R
Symbol
Description
Min
Typ
Max
Unit
Comments
Rh_oscin
Resistance OSCIN-VSS
10
M
Rh_oscout
Resistance OSCOUT-VSS
10
M
Rh_oscin_oscout
Resistance OSCIN-OSCOUT
50
M
Cp_oscin
Capacitance OSCIN-VSS
0.5
3.0
pF
Cp_oscout
Capacitance OSCOUT-VSS
0.5
3.0
pF
Cp_oscin_oscout
Capacitance OSCIN-OSCOUT
0.2
1.0
pF
Table 7-9. Board layout specifications.
The oscillator characteristics are given in Table 7-10. The characteristics are valid only if the crystal and board
layout meet the specifications above.
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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