CS1258系列AFE用户手册v02.docx

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CS1258系列AFE用户手册v02.docx

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CS1258系列AFE用户手册v02.docx

CS1258系列AFE用户手册v02

CS1258芯片用户手册V0.2绝密文档，注意保密

CS1258芯片用户手册

带24bitsADC和BIM的高性能AFE

REV0.2

通讯地址：

深圳市南山区蛇口南海大道1079号花园城数码大厦A座9楼

邮政编码：

518067

公司电话：

+（86755）86169257

传真：

+（86755）86169057

公司网站：

40页

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CS1258芯片用户手册

版本历史

修改记录日期

0.1预览版本2016/3/15

0.2.更新了电气特性2016/3/29

.更新了典型应用图

.更新了封装图

40页

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版本历史..........................................................................................................................................2

目录................................................................................................................................................3

图目录..............................................................................................................................................5

表目录..............................................................................................................................................5

1简介...........................................................................................................................................6

1.1主要特性...................................................................................................................6

1.2应用场合...................................................................................................................6

1.3功能说明...................................................................................................................6

1.4极限值.......................................................................................................................8

1.5电气特性...................................................................................................................9

1.6可靠性指标.............................................................................................................10

1.7产品型号及引脚.....................................................................................................11

1.8典型应用电路.........................................................................................................12

2功能寄存器说明.....................................................................................................................13

2.1功能寄存器列表.....................................................................................................13

2.2功能寄存器说明.....................................................................................................13

2.2.1SYS—系统配置寄存器........................................................................................13

2.2.2ADC0—ADC配置寄存器....................................................................................14

2.2.3ADC1—ADC配置寄存器1.................................................................................14

2.2.4ADC2—ADC配置寄存器2.................................................................................15

2.2.5ADC3—ADC配置寄存器3.................................................................................15

2.2.6ADC4—ADC配置寄存器4.................................................................................16

2.2.7ADC5—ADC配置寄存器5.................................................................................16

2.2.8BIM0—BIM配置寄存器0...................................................................................17

2.2.9BIM1—BIM配置寄存器......................................................................................17

2.2.10ADO—ADC转换数据寄存器..............................................................................18

2.2.11ADS—ADC转换数据读取标准寄存器...............................................................18

3功能描述.................................................................................................................................19

3.1输入选择.................................................................................................................19

3.2输入电平移位器.....................................................................................................19

3.3IDAC1/IDAC0和输入通道...................................................................................20

3.4PGA和ADC..........................................................................................................21

3.5数字滤波器.............................................................................................................23

3.5.1频率响应.................................................................................................................23

3.5.2建立时间.................................................................................................................23

3.6人体阻抗测量.........................................................................................................25

3.6.1正弦信号发生器.....................................................................................................25

3.6.2激励电极及测量电极.............................................................................................26

3.6.3整流.........................................................................................................................26

3.6.4阻抗校准.................................................................................................................27

3.7参考电压源.............................................................................................................28

3.8内部时钟源.............................................................................................................28

3.9温度传感器.............................................................................................................28

3.10测量模式及其切换.................................................................................................28

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3.11多种工作模式.........................................................................................................29

3.12复位和断电（POR&powerdown）...........................................................................30

4转换有效位.............................................................................................................................31

5典型特性.................................................................................................................................32

5.1ADC典型特性.......................................................................................................32

5.2LDO/VREF典型特性............................................................................................32

5.3内部时钟典型特性.................................................................................................32

5.4IDAC典型特性......................................................................................................32

5.5BIM典型特性........................................................................................................32

6三线串行通讯接口.................................................................................................................37

6.1.1读时序.....................................................................................................................38

6.1.2写时序.....................................................................................................................38

7封装.........................................................................................................................................40

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图目录

图1.1CS1258原理框图..........................................................................................................7

图1.2CS1258引脚图............................................................................................................11

图1.3CS1258典型应用电路................................................................................................12

图3.1模拟输入结构图..........................................................................................................19

图3.2电平移位模块..............................................................................................................20

图3.3IDAC1/IDAC0结构及与输入通道关系....................................................................20

图3.4PGA和ADC结构图...................................................................................................21

图3.5COMB滤波器的频率响应特性（Fs=331Hz，DR=10Hz，3阶COMB）................23

图3.6COMB建立过程.........................................................................................................24

图3.7BIM模块结构图.........................................................................................................25

图3.8CS1258低功耗工作示意图........................................................................................29

图5.1内部时钟全电压全温度范围的典型特性..................................................................32

图5.2FWR模式下220欧姆纯电阻网络的测试结果.........................................................33

图5.3FWR模式下1000欧姆纯电阻网络的测试结果.......................................................33

图5.4FWR模式下1958欧姆纯电阻网络的测试结果.......................................................34

图5.5FWR+MIX模式510ohm+470pF并联网络的阻抗绝对值测试结果.......................34

图5.6FWR+MIX模式510ohm+470pF并联网络的相位角测试结果...............................35

图5.7FWR+MIX模式1018Ohm+10nF并联网络的阻抗绝对值测试结果......................35

图5.8FWR+MIX模式1018Ohm+10nF并联网络的相位角测试结果..............................36

图6.1读操作时序1（读AD值）.............................................................................................38

图6.2读操作时序2（除AD值之外的寄存器）.....................................................................38

图6.3写操作时序..................................................................................................................39

图7.1芯片LQFP32封装尺寸信息（天水）............................................................................40

表目录

表1.1CS1258极限值........................................................................

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