ZHCS146C December 2011 – April 2020 ADS1291 , ADS1292 , ADS1292R
PRODUCTION DATA.
- 1 特性
- 2 应用
- 3 说明
- 4 修订历史记录
- 5 Pin Configuration and Functions
- 6 Specifications
- 7 Parameter Measurement Information
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 EMI Filter
- 8.3.2
Input Multiplexer
- 8.3.2.1 Device Noise Measurements
- 8.3.2.2 Test Signals (TestP and TestN)
- 8.3.2.3 Auxiliary Differential Input (RESP_MODN/IN3N, RESP_MODN/IN3P)
- 8.3.2.4 Temperature Sensor (TEMPP, TEMPN)
- 8.3.2.5 Supply Measurements (MVDDP, MVDDN)
- 8.3.2.6 Lead-Off Excitation Signals (LoffP, LoffN)
- 8.3.2.7 Auxiliary Single-Ended Input
- 8.3.3 Analog Input
- 8.3.4 PGA Settings and Input Range
- 8.3.5 Digital Decimation Filter
- 8.3.6 Reference
- 8.3.7 Clock
- 8.3.8 Data Format
- 8.3.9 Multiple Device Configuration
- 8.3.10 ECG-Specific Functions
- 8.3.11 Setting the Device for Basic Data Capture
- 8.4 Device Functional Modes
- 8.5
Programming
- 8.5.1 SPI Interface
- 8.5.2
SPI Command Definitions
- 8.5.2.1 WAKEUP: Exit STANDBY Mode
- 8.5.2.2 STANDBY: Enter STANDBY Mode
- 8.5.2.3 RESET: Reset Registers to Default Values
- 8.5.2.4 START: Start Conversions
- 8.5.2.5 STOP: Stop Conversions
- 8.5.2.6 OFFSETCAL: Channel Offset Calibration
- 8.5.2.7 RDATAC: Read Data Continuous
- 8.5.2.8 SDATAC: Stop Read Data Continuous
- 8.5.2.9 RDATA: Read Data
- 8.5.2.10 Sending Multi-Byte Commands
- 8.5.2.11 RREG: Read From Register
- 8.5.2.12 WREG: Write to Register
- 8.6
Register Maps
- 8.6.1
User Register Description
- 8.6.1.1 ID: ID Control Register (Factory-Programmed, Read-Only) (address = 00h)
- 8.6.1.2 CONFIG1: Configuration Register 1 (address = 01h)
- 8.6.1.3 CONFIG2: Configuration Register 2 (address = 02h)
- 8.6.1.4 LOFF: Lead-Off Control Register (address = 03h)
- 8.6.1.5 CH1SET: Channel 1 Settings (address = 04h)
- 8.6.1.6 CH2SET: Channel 2 Settings (address = 05h)
- 8.6.1.7 RLD_SENS: Right Leg Drive Sense Selection (address = 06h)
- 8.6.1.8 LOFF_SENS: Lead-Off Sense Selection (address = 07h)
- 8.6.1.9 LOFF_STAT: Lead-Off Status (address = 08h)
- 8.6.1.10 RESP1: Respiration Control Register 1 (address = 09h)
- 8.6.1.11 RESP2: Respiration Control Register 2 (address = 0Ah)
- 8.6.1.12 GPIO: General-Purpose I/O Register (address = 0Bh)
- 8.6.1
User Register Description
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文档支持
- 13机械、封装和可订购信息
封装选项
机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息
8.3.2.4 Temperature Sensor (TEMPP, TEMPN)
The ADS1291, ADS1292, and ADS1292R contain an on-chip temperature sensor. This sensor uses two internal diodes with one diode having a current density 16x that of the other, as shown in Figure 19. The difference in diode current densities yields a difference in voltage that is proportional to absolute temperature.
Figure 19. Temperature Sensor Measurement in the Input As a result of the low thermal resistance of the package to the printed circuit board (PCB), the internal device temperature tracks the PCB temperature closely. Note that self-heating of the ADS1291, ADS1292, and ADS1292R causes a higher reading than the temperature of the surrounding PCB.
The scale factor of Equation 3 converts the temperature reading to °C. Before using this equation, the temperature reading code must first be scaled to μV.
