参数资料
型号: XE8000EV121
厂商: Semtech
文件页数: 11/53页
文件大小: 0K
描述: BOARD EVAL FOR SX8723/24
标准包装: 1
主要目的: 接口,传感器至模数转换器接口,可编程
嵌入式:
已用 IC / 零件: SX8723,SX8724,SX8725
主要属性: 用于桥型传感器的信号调节
次要属性: GUI,最多 16 位,1/12 ~ 1000 可编程增益,I2C 接口
已供物品: 板,CD
产品目录页面: 585 (CN2011-ZH PDF)
相关产品: SX8725E083DKR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082DKR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083CT-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082CT-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083TR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082TR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
ADVANCED COMMUNICATIONS & SENSING
V1.23 2009 Semtech Corp.
www.semtech.com
19
SX8724
ZoomingADC for Pressure and Temperature Sensing
Input Multiplexers
The ZoomingADC has eight analog inputs AC0 to AC7 and four reference inputs AC_R0 to AC_R3. Let us first
define the differential input voltage VIN and reference voltage VREF,ADC respectively as:
INN
INP
IN
V
=
(V)
Equation 3
and:
REFN
REFP
ADC
REF
V
=
,
(V)
Equation 4
As shown in Table 2, the inputs can be configured in two ways: either as 4 differential channels (VIN1 = AC1 -
AC0,..., VIN4 = AC7 - AC6), or AC0 can be used as a common reference, providing 7 signal paths all referred to
AC0. 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
AC1 (VREF)
AC0 (VSS)
01x00
AC0 (VSS)
AC1 (VREF)
00x01
AC3
AC2
01x01
AC2
AC3
00x10
AC5
AC4
01x10
AC4
AC5
00x11
AC7
AC6
01x11
AC6
AC7
10000
AC0 (VSS)
11000
AC0 (VSS)
10001
AC1 (VREF)
11001
AC1 (VREF)
10010
AC2
11010
AC2
10011
AC3
11011
AC3
10100
AC4
11100
AC4
10101
AC5
11101
AC5
10110
AC6
11110
AC6
10111
AC7
AC0 (VSS)
11111
AC0 (VSS)
AC7
Table 2 - Analog Input Selection
Similarly, the reference voltage is chosen among two differential channels (VREF,ADC = AC_R1 - AC_R0 or
VREF,ADC = AC_R3 - AC_R2) as shown in Table 3. 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_R1 (VBATT)
AC_R0 (VSS)
1
AC_R3 (VREF)
AC_R2 (VSS)
Table 3 - Analog Reference Input Selection
相关PDF资料
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