CS1256 芯片用户手册

绝

密

版

究

芯

司

第

共

3

页

目 录

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...............................................................................................................9

1.7

产品型号及引脚.....................................................................................................10

1.8

典型应用电路.........................................................................................................10

2

功能寄存器说明.....................................................................................................................12

2.1

功能寄存器列表.....................................................................................................12

2.2

功能寄存器说明.....................................................................................................12

2.2.1

SYS —系统配置寄存器 ........................................................................................12

2.2.2

ADC0— ADC 配置寄存器 ....................................................................................13

2.2.3

ADC1— ADC 配置寄存器 1 .................................................................................13

2.2.4

ADC3— ADC 配置寄存器 3 .................................................................................14

2.2.5

ADC4— ADC 配置寄存器 4 .................................................................................14

2.2.6

ADC5— ADC 配置寄存器 5 .................................................................................15

2.2.7

BIM0— BIM 配置寄存器 0 ...................................................................................15

2.2.8

BIM1— BIM 配置寄存器......................................................................................16

2.2.9

ADO— ADC 转换数据寄存器 ..............................................................................16

2.2.10

ADS— ADC 转换数据读取标准寄存器...............................................................16

3

功能描述.................................................................................................................................17

3.1

输入选择.................................................................................................................17

3.2

PGA 和 ADC ..........................................................................................................17

3.3

数字滤波器.............................................................................................................18

3.3.1

频率响应.................................................................................................................18

3.3.2

建立时间.................................................................................................................19

3.4

人体阻抗测量.........................................................................................................20

3.4.1

正弦信号发生器.....................................................................................................20

3.4.2

激励电极及测量电极.............................................................................................21

3.4.3

整流.........................................................................................................................21

3.4.4

阻抗校准.................................................................................................................22

3.5

参考电压源.............................................................................................................23

3.6

内部时钟源.............................................................................................................23

3.7

温度传感器.............................................................................................................23

3.8

测量模式及其切换.................................................................................................23

3.9

多种工作模式.........................................................................................................24

3.10

复位和断电(POR&power down) ...........................................................................25