參數(shù)資料
型號: SX8722I070TRLF
廠商: Semtech
文件頁數(shù): 47/108頁
文件大?。?/td> 0K
描述: IC ZOOMING ADC 10BIT 16CH 44MLPQ
標準包裝: 1
類型: 壓力傳感器
輸入類型: 邏輯
輸出類型: 邏輯
接口: I²C
電流 - 電源: 300µA
安裝類型: 表面貼裝
封裝/外殼: 44-VFQFN 裸露焊盤
供應商設備封裝: 44-MLPQ(7x7)
包裝: 標準包裝
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
配用: XE8000EV120-ND - BOARD EVAL FOR SX8722I070TRLF
其它名稱: SX8722I070LFDKR
ACS - Revision 4.2
October 2008
2008 Semtech Corp.
www.semtech.com
Page 43
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8722
High gain acquisition for sensor interface
11.4. Filtering
11.4.1. Filter types
There are 2 different filtering types:
1. Average filtering.
2. Moving average filtering.
The average filtering is an addition of n values divided by n, this kind of filter is useful when having a very noisy signal; the
maximum average value is 256.
Advantage: Reduces noise due to the high quantity of samples.
Disadvantage: Takes the acquisition time of n samples to have a result.
The sliding window averaging is a filter that takes the n last measurements and gives the mean value of them.
Advantage: result on each acquisition.
Disadvantage: limited at ten samples. Additional delay.
Important note:
The ADC filtering is faster, these additional filters should be used only if the number of conversion (NELCONV)
and the over sampling rate (OSR) are set to their maximum.
11.4.2. Configuration register - filtering
This register is present in each configuration; the bits 4 to 6 are controlling the filtering mode.
Table 27. Filtering mode in configuration registers; addresses 0x10, 0x30, 0x50, 0x70
The table below shows the filter selection.
Table 28. Filter selection
Register
76543210
CxSXCfg
reserved
FILTER TYPE[2:0]
ALRM1
ALRM2
SINGLE
CONT
Filter type [6:4]
Code
Mode
000
none
001
average filtering
010
moving average filtering
011
reserved
Not
Recommended
for
New
Designs
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