参数资料
型号: XE8801AMI000WP
厂商: Semtech
文件页数: 124/135页
文件大小: 0K
描述: SENSING MACHINE WITH 16 + 10 BIT
标准包装: 558
系列: XE880x
应用: 感测机
核心处理器: Coolrisc816?
程序存储器类型: 闪存(22 kB)
控制器系列: XE8000
RAM 容量: 512 x 8
接口: UART,USRT
输入/输出数: 24
电源电压: 2.4 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 模具
包装: 托盘
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名称: Q2722595
Semtech 2005
www.semtech.com
16-4
XE8801A – SX8801R
pos.
RegAcCfg2
rw
reset
description
7:6
FIN[1:0]
r w
00 resetsystem
Sampling frequency selection
5:4
PGA2_GAIN[1:0]
r w
00 resetsystem
PGA2 stage gain selection
3:0
PGA2_OFFSET[3:0]
r w
0000
resetsystem
PGA2 stage offset selection
Table 16-6: RegAcCfg2
pos.
RegAcCfg3
rw
reset
description
7
PGA1_GAIN
r w
0 resetsystem
PGA1 stage gain selection
6:0
PGA3_GAIN[6:0]
r w
0000000
resetsystem
PGA3 stage gain selection
Table 16-7: RegAcCfg3
pos.
RegAcCfg4
rw
reset
description
7
reserved
r
0
Unused
6:0
PGA3_OFFSET[6:0]
r w
0000000
resetsystem
PGA3 stage offset selection
Table 16-8: RegAcCfg4
pos.
RegAcCfg5
rw
reset
description
7
BUSY
r
0 resetsystem
Activity flag
6
DEF
w r0
0
Selects default configuration
5:1
AMUX[4:0]
r w
00000
resetsystem
Input channel configuration selector
0
VMUX
r w
0 resetsystem
Reference channel selector
Table 16-9: RegAcCfg5
16.4
ZoomingADC
Description
Figure 16-2 gives a more detailed description of the acquisition chain.
16.4.1
Acquisition Chain
Figure 16-1 shows the general block diagram of the acquisition chain (AC). A control block (not shown in Figure
16-1) manages all communications with the CoolRisc
microcontroller.
Analog inputs can be selected among eight input channels, while reference input is selected between two differential
channels.
The core of the zooming section is made of three differential programmable amplifiers (PGA). After selection of a
combination of input and reference signals VIN and VREF, the input voltage is modulated and amplified through stages
1 to 3. Fine gain programming up to 1'000V/V is possible. In addition, the last two stages provide programmable
offset. Each amplifier can be bypassed if needed.
The output of the PGA stages is directly fed to the analog-to-digital converter (ADC), which converts the signal
VIN,ADC into digital.
Not
Recommended
for
New
Designs
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