參數(shù)資料
型號: XE8801AMI027LF
廠商: Semtech
文件頁數(shù): 129/135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
16-8
XE8801A – SX8801R
16.5
Input Multiplexers
The ZoomingADC
has eight analog inputs AC_A(0) to AC_A(7) and four reference inputs AC_R(0) to AC_R(3).
Let us first define the differential input voltage VIN and reference voltage VREF respectively as:
INN
INP
IN
V
=
(V)
(Eq. 3)
and:
REFN
REFP
REF
V
=
(V)
(Eq. 4)
As shown in Table 16-11 the inputs can be configured in two ways: either as 4 differential channels (VIN1 = AC_A(1)
- AC_A(0),..., VIN4 = AC_A(7) - AC_A(6)), or AC_A(0) can be used as a common reference, providing 7 signal
paths all referred to AC_A(0). The control word for the analog input selection is AMUX[4:0]. Notice that the bit
AMUX[3]
controls the sign of the input voltage.
AMUX[4:0]
(RegAcCfg5[5:1])
VINP
VINN
AMUX[4:0]
(RegAcCfg5[5:1])
VINP
VINN
00x00
00x01
00x10
00x11
AC_A(1)
AC_A(3)
AC_A(5)
AC_A(7)
AC_A(0)
AC_A(2)
AC_A(4)
AC_A(6)
01x00
01x01
01x10
01x11
AC_A(0)
AC_A(2)
AC_A(4)
AC_A(6)
AC_A(1)
AC_A(3)
AC_A(5)
AC_A(7)
10000
10001
10010
10011
10100
10101
10110
10111
AC_A(0)
AC_A(1)
AC_A(2)
AC_A(3)
AC_A(4)
AC_A(5)
AC_A(6)
AC_A(7)
AC_A(0)
11000
11001
11010
11011
11100
11101
11110
11111
AC_A(0)
AC_A(1)
AC_A(2)
AC_A(3)
AC_A(4)
AC_A(5)
AC_A(6)
AC_A(7)
Table 16-11. Analog input selection
Similarly, the reference voltage is chosen among two differential channels (VREF1 = AC_R(1)-AC_R(0) or VREF2 =
AC_R(3)-AC_R(2)
) as shown in Table 16-12. The selection bit is VMUX. The reference inputs VREFP and VREFN
(common-mode) can be up to the power supply range.
VMUX
(RegAcCfg5[0])
VREFP
VREFN
0
AC_R(1)
AC_R(0)
1
AC_R(3)
AC_R(2)
Table 16-12. Analog Reference input selection
Not
Recommended
for
New
Designs
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