参数资料
型号: XE8805AMI028LF
厂商: Semtech
文件页数: 144/156页
文件大小: 0K
描述: IC DAS 16BIT FLASH 8K MTP 64LQFP
标准包装: 160
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: 64-LQFP
包装: 托盘
供应商设备封装: 64-LQFP(10x10)
产品目录页面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2006
www.semtech.com
16-2
XE8805/05A
16.1
ZoomingADC
Features
The ZoomingADC
is a complete and versatile low-power analog front-end interface typically intended for sensing
applications. The key features of the ZoomingADC
are:
Programmable 6 to 16-bit dynamic range oversampled ADC
Flexible gain programming between 0.5 and 1000
Flexible and large range offset compensation
4-channel differential or 8-channel single-ended input multiplexer
2-channel differential reference inputs
Power saving modes
Direct interfacing to CoolRisc
microcontroller
16.2
Overview
PGA1
PGA2
PGA3
ADC
MU
X
MU
X
GD1
GD2
GD3
OFF2
OFF3
0
1
2
3
4
5
6
7
0
1
2
3
Analog
Inputs
16
V
IN
f
S
V
REF
V
IN,ADC
Gain1 Gain2
Gain3
Offset3
Offset2
Reference
Selection
Input
Selection
ZOOM
Reference
Inputs
V
D1
V
D2
f
S
Figure 16-1. ZoomingADC
general functional block diagram
The total acquisition chain consists of an input multiplexer, 3 programmable gain amplifier stages and an
oversampled A/D converter. The reference voltage can be selected on two different channels. Two offset
compensation amplifiers allow for a wide offset compensation range. The programmable gain and offset allow one
to zoom in on a small portion of the reference voltage defined input range.
16.3
Register map
There are eight registers in the acquisition chain (AC), namely RegAcOutLsb, RegAcOutMsb, RegAcCfg0,
RegAcCfg1, RegAcCfg2, RegAcCfg3, RegAcCfg4 and RegAcCfg5. Table 16-2 to Table 16-9 show the mapping
of control bits and functionality of these registers while Table 16-1 gives an overview of these eight.
The register map only gives a short description of the different configuration bits. More detailed information is found
in subsequent sections.
Not
Recommended
for
New
Designs
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