參數(shù)資料
型號: SX8722I070TRLF
廠商: Semtech
文件頁數(shù): 62/108頁
文件大?。?/td> 0K
描述: IC ZOOMING ADC 10BIT 16CH 44MLPQ
標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝: 44-MLPQ(7x7)
包裝: 標(biāo)準(zhǔn)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 57
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8722
High gain acquisition for sensor interface
PGA3_GAIN:
(rw) sets the gain of the third stage to PGA3_GAIN[6:0] 1/12.
PGA2_OFFSET:
(rw) sets the offset of the second stage between -1 and +1, with increments of 0.2. The MSB gives the sign (0
positive, 1 negative); amplitude is coded with the bits PGA2_OFFSET[5:0].
PGA3_OFFSET:
(rw) sets the offset of the third stage between -5.25 and +5.25, with increments of 1/12. The MSB gives the sign (0
positive, 1 negative); amplitude is coded with the bits PGA3_OFFSET[5:0].
AMUX(4:0):
(rw) AMUX[4] sets the mode (0 ' 4 differential inputs, 1 ' 7 inputs with A(0) = common reference) AMUX(3) sets the sign
(0 ' straight, 1' cross) AMUX[2:0] sets the channel.
VMUX:
(rw) sets the differential reference channel (0 ' R(1) and R(0), 1 ' R(3) and R(2)).
(r = read; w = write; rw = read & write)
12.6. 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:
and:
As shown in Table 41 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.
Table 41. Analog input selection
(Eq. 3)
(Eq. 4)
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)
INN
INP
IN
V
=
V
[]
REFN
REFP
REF
V
=
V
[]
Not
Recommended
for
New
Designs
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