SBAS780B December   2016  – March 2021 ADS8661 , ADS8665

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  Timing Requirements: Conversion Cycle
    7. 6.7  Timing Requirements: Asynchronous Reset
    8. 6.8  Timing Requirements: SPI-Compatible Serial Interface
    9. 6.9  Timing Requirements: Source-Synchronous Serial Interface (External Clock)
    10. 6.10 Timing Requirements: Source-Synchronous Serial Interface (Internal Clock)
    11. 6.11 Timing Diagrams
    12. 6.12 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Input Structure
      2. 7.3.2 Analog Input Impedance
      3. 7.3.3 Input Protection Circuit
      4. 7.3.4 Programmable Gain Amplifier (PGA)
      5. 7.3.5 Second-Order, Low-Pass Filter (LPF)
      6. 7.3.6 ADC Driver
      7. 7.3.7 Reference
        1. 7.3.7.1 Internal Reference
        2. 7.3.7.2 External Reference
      8. 7.3.8 ADC Transfer Function
      9. 7.3.9 Alarm Features
        1. 7.3.9.1 Input Alarm
        2. 7.3.9.2 AVDD Alarm
    4. 7.4 Device Functional Modes
      1. 7.4.1 Host-to-Device Connection Topologies
        1. 7.4.1.1 Single Device: All multiSPI Options
        2. 7.4.1.2 Single Device: Standard SPI Interface
        3. 7.4.1.3 Multiple Devices: Daisy-Chain Topology
      2. 7.4.2 Device Operational Modes
        1. 7.4.2.1 RESET State
        2. 7.4.2.2 ACQ State
        3. 7.4.2.3 CONV State
    5. 7.5 Programming
      1. 7.5.1 Data Transfer Frame
      2. 7.5.2 Input Command Word and Register Write Operation
      3. 7.5.3 Output Data Word
      4. 7.5.4 Data Transfer Protocols
        1. 7.5.4.1 Protocols for Configuring the Device
        2. 7.5.4.2 Protocols for Reading From the Device
          1. 7.5.4.2.1 Legacy, SPI-Compatible (SYS-xy-S) Protocols with a Single SDO-x
          2. 7.5.4.2.2 Legacy, SPI-Compatible (SYS-xy-S) Protocols With Dual SDO-x
          3. 7.5.4.2.3 Source-Synchronous (SRC) Protocols
            1. 7.5.4.2.3.1 Output Clock Source Options
            2. 7.5.4.2.3.2 Output Bus Width Options
    6. 7.6 Register Maps
      1. 7.6.1 Device Configuration and Register Maps
        1. 7.6.1.1 DEVICE_ID_REG Register (address = 00h)
        2. 7.6.1.2 RST_PWRCTL_REG Register (address = 04h)
        3. 7.6.1.3 SDI_CTL_REG Register (address = 08h)
        4. 7.6.1.4 SDO_CTL_REG Register (address = 0Ch)
        5. 7.6.1.5 DATAOUT_CTL_REG Register (address = 10h)
        6. 7.6.1.6 RANGE_SEL_REG Register (address = 14h)
        7. 7.6.1.7 ALARM_REG Register (address = 20h)
        8. 7.6.1.8 ALARM_H_TH_REG Register (address = 24h)
        9. 7.6.1.9 ALARM_L_TH_REG Register (address = 28h)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
    1. 9.1 Power Supply Decoupling
    2. 9.2 Power Saving
      1. 9.2.1 NAP Mode
      2. 9.2.2 Power-Down (PD) Mode
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.6.1.2 RST_PWRCTL_REG Register (address = 04h)

This register controls the reset and power-down features offered by the converter.

Any write operation to the RST_PWRCTL_REG register must be preceded by a write operation with the register address set to 05h and the register data set to 69h.

Figure 7-33 RST_PWRCTL_REG Register
31302928272625242322212019181716
Reserved
R-0000h
1514131211109876543210
WKEY[7:0]ReservedVDD_AL_
DIS		IN_AL_DISReservedRSTn_APPNAP_ENPWRDN
R/W-00hR-00bR/W-0bR/W-0bR-0bR/W-<0>bR/W-<0>bR/W-0b
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset; -0, -1 = Condition after application reset;
-<0>, -<1> = Condition after power-on reset
Address for bits 7-0 = 04hAddress for bits 15-8 = 05hAddress for bits 23-16 = 06hAddress for bits 31-24 = 07h
Table 7-12 RST_PWRCTL_REG Register Field Descriptions
BitFieldTypeResetDescription
31-16ReservedR0000hReserved. Reads return 0000h.
15-8WKEY[7:0]R/W00hThis value functions as a protection key to enable writes to bits 5-0.
Bits are written only if WKEY is set to 69h first.
7-6ReservedR00bReserved. Reads return 00b
5VDD_AL_DISR/W0b0b = VDD alarm is enabled
1b = VDD alarm is disabled
4IN_AL_DISR/W0b0b = Input alarm is enabled
1b = Input alarm is disabled
3ReservedR0bReserved. Reads return 0h.
2RSTn_APP(1)R/W0b0b = RST pin functions as a POR class reset (causes full device initialization)
1b = RST pin functions as an application reset (only user-programmed modes are cleared)
1NAP_EN(2)R/W0b0b = Disables the NAP mode of the converter
1b = Enables the converter to enter NAP mode if CONVST/CS is held high after the current conversion completes
0PWRDN(2)R/W0b0b = Puts the converter into active mode
1b = Puts the converter into power-down mode
(1) Setting this bit forces the RST pin to function as an application reset until the next power cycle.
(2) See the Section 6.5 table for details on the latency encountered when entering and exiting the associated low-power mode.