The word FIN[1:0] is used to select the sampling frequency f" />
參數(shù)資料
型號: XE8805AMI028LF
廠商: Semtech
文件頁數(shù): 3/156頁
文件大?。?/td> 0K
描述: IC DAS 16BIT FLASH 8K MTP 64LQFP
標(biāo)準(zhǔn)包裝: 160
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: 64-LQFP
包裝: 托盤
供應(yīng)商設(shè)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
16-14
XE8805/05A
16.7.2
Sampling Frequency
The word FIN[1:0] is used to select the sampling frequency fS (Table 16-19). Three sub-multiples of the internal
RC-based frequency fRCEXT can be chosen. For FIN = "11", sampling frequency is about 8kHz. Additional
information on oscillators and their control can be found in the clock block documentation.
Sampling Frequency fS (Hz)
FIN[1:0]
01/05
02
00
1/4
f
RC
1/8
f
RCEXT
01
1/8
f
RC
1/16
f
RCEXT
10
1/32
f
RC
1/64
f
RCEXT
11
8kHz
4kHz
Table 16-19. Sampling frequency settings (fRC= RC-based frequency)
16.7.3
Over-Sampling Ratio
The over-sampling ratio (OSR) defines the number of integration cycles per elementary conversion. Its value is set
with the word SET_OSR[2:0] in power of 2 steps (see Table 16-20) given by:
0]
:
SET_OSR[2
3
2
+
=
OSR
(-)
(Eq. 13)
SET_OSR[2:0]
(RegAcCfg0[4:2])
Over-Sampling Ratio
OSR (-)
000
8
001
16
010
32
011
64
100
128
101
256
110
512
111
1024
Table 16-20. Over-sampling ratio settings
16.7.4
Elementary Conversions
As mentioned previously, the whole conversion sequence is made of a set of NELCONV elementary incremental
conversions. This number is set with the word SET_NELC[1:0] in power of 2 steps (see Table 16-21) given by:
0]
:
SET_NELC[1
2
=
ELCONV
N
(-)
(Eq. 14)
Not
Recommended
for
New
Designs
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