SLVSEA2D August   2020  – April 2024 DRV8714-Q1 , DRV8718-Q1

PRODMIX  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
    1. 5.1 VQFN (RVJ) 56-Pin Package and Pin Functions
    2. 5.2 VQFN (RHA) 40-Pin Package and Pin Functions
    3. 5.3 HTQFP (PHP) 48-Pin Package and Pin Functions
  7. 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
    7. 6.7 Timing Diagrams
    8. 6.8 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 External Components
      2. 7.3.2 Device Interface Variants
        1. 7.3.2.1 Serial Peripheral Interface (SPI)
        2. 7.3.2.2 Hardware (H/W)
      3. 7.3.3 Input PWM Control Modes
        1. 7.3.3.1 Half-Bridge Control Scheme With Input PWM Mapping
          1. 7.3.3.1.1 DRV8718-Q1 Half-Bridge Control
          2. 7.3.3.1.2 DRV8714-Q1 Half-Bridge Control
        2. 7.3.3.2 H-Bridge Control
          1. 7.3.3.2.1 DRV8714-Q1 H-Bridge Control
        3. 7.3.3.3 Split HS and LS Solenoid Control
          1. 7.3.3.3.1 DRV8714-Q1 Split HS and LS Solenoid Control
      4. 7.3.4 Smart Gate Driver
        1. 7.3.4.1 Functional Block Diagram
        2. 7.3.4.2 Slew Rate Control (IDRIVE)
        3. 7.3.4.3 Gate Drive State Machine (TDRIVE)
        4. 7.3.4.4 Propagation Delay Reduction (PDR)
          1. 7.3.4.4.1 PDR Pre-Charge/Pre-Discharge Control Loop Operation Details
            1. 7.3.4.4.1.1 PDR Pre-Charge/Pre-Discharge Setup
          2. 7.3.4.4.2 PDR Post-Charge/Post-Discharge Control Loop Operation Details
            1. 7.3.4.4.2.1 PDR Post-Charge/Post-Discharge Setup
          3. 7.3.4.4.3 Detecting Drive and Freewheel MOSFET
        5. 7.3.4.5 Automatic Duty Cycle Compensation (DCC)
        6. 7.3.4.6 Closed Loop Slew Time Control (STC)
          1. 7.3.4.6.1 STC Control Loop Setup
      5. 7.3.5 Tripler (Dual-Stage) Charge Pump
      6. 7.3.6 Wide Common-Mode Current Shunt Amplifiers
      7. 7.3.7 Pin Diagrams
        1. 7.3.7.1 Logic Level Input Pin (INx/ENx, INx/PHx, nSLEEP, nSCS, SCLK, SDI)
        2. 7.3.7.2 Logic Level Push Pull Output (SDO)
        3. 7.3.7.3 Logic Level Multi-Function Pin (DRVOFF/nFLT)
        4. 7.3.7.4 Quad-Level Input (GAIN, MODE)
        5. 7.3.7.5 Six-Level Input (IDRIVE, VDS)
      8. 7.3.8 Protection and Diagnostics
        1. 7.3.8.1  Gate Driver Disable (DRVOFF/nFLT and EN_DRV)
        2. 7.3.8.2  Low IQ Powered Off Braking (POB, BRAKE)
        3. 7.3.8.3  Fault Reset (CLR_FLT)
        4. 7.3.8.4  DVDD Logic Supply Power on Reset (DVDD_POR)
        5. 7.3.8.5  PVDD Supply Undervoltage Monitor (PVDD_UV)
        6. 7.3.8.6  PVDD Supply Overvoltage Monitor (PVDD_OV)
        7. 7.3.8.7  VCP Charge Pump Undervoltage Lockout (VCP_UV)
        8. 7.3.8.8  MOSFET VDS Overcurrent Protection (VDS_OCP)
        9. 7.3.8.9  Gate Driver Fault (VGS_GDF)
        10. 7.3.8.10 Thermal Warning (OTW)
        11. 7.3.8.11 Thermal Shutdown (OTSD)
        12. 7.3.8.12 Offline Short Circuit and Open Load Detection (OOL and OSC)
        13. 7.3.8.13 Watchdog Timer
        14. 7.3.8.14 Fault Detection and Response Summary Table
    4. 7.4 Device Functional Modes
      1. 7.4.1 Inactive or Sleep State
      2. 7.4.2 Standby State
      3. 7.4.3 Operating State
    5. 7.5 Programming
      1. 7.5.1 SPI Interface
      2. 7.5.2 SPI Format
      3. 7.5.3 SPI Interface for Multiple Slaves
        1. 7.5.3.1 SPI Interface for Multiple Slaves in Daisy Chain
  9. 8 Register Maps
    1. 8.1 DRV8718-Q1 Register Map
    2. 8.2 DRV8714-Q1 Register Map
    3. 8.3 DRV8718-Q1 Register Descriptions
      1. 8.3.1 DRV8718-Q1_STATUS Registers
      2. 8.3.2 DRV8718-Q1_CONTROL Registers
      3. 8.3.3 DRV8718-Q1_CONTROL_ADV Registers
      4. 8.3.4 DRV8718-Q1_STATUS_ADV Registers
    4. 8.4 DRV8714-Q1 Register Descriptions
      1. 8.4.1 DRV8714-Q1_STATUS Registers
      2. 8.4.2 DRV8714-Q1_CONTROL Registers
      3. 8.4.3 DRV8714-Q1_CONTROL_ADV Registers
      4. 8.4.4 DRV8714-Q1_STATUS_ADV Registers
  10. 9  Application Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Gate Driver Configuration
          1. 9.2.2.1.1 VCP Load Calculation Example
          2. 9.2.2.1.2 IDRIVE Calculation Example
          3. 9.2.2.1.3 tDRIVE Calculation Example
          4. 9.2.2.1.4 Maximum PWM Switching Frequency
        2. 9.2.2.2 Current Shunt Amplifier Configuration
        3. 9.2.2.3 Power Dissipation
      3. 9.2.3 Application Curves
    3. 9.3 Initialization
    4. 9.4 Power Supply Recommendations
      1. 9.4.1 Bulk Capacitance Sizing
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
      2. 9.5.2 Layout Example
  11. 10Device Documentation and Support
    1. 10.1 Documentation Support
      1. 10.1.1 Related Documents
    2. 10.2 Receiving Notification of Documentation Updates
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Package Option Addendum
7.3.3.2.1 DRV8714-Q1 H-Bridge Control

In the H-bridge control mode, each two pairs of half-bridge gate drivers can be controlled as an H-bridge gate driver for a total of two H-bridge gate drivers for the DRV8714-Q1. The H-bridge pairs are half-bridges 1 / 2 and 3 / 4 for the DRV8714-Q1. The DRV8714-Q1 can control the 2 H-bridge gate driver pairs through direct inputs pins or SPI control registers. The H-bridge gate drivers have two input control modes that can be configured through the BRG_MODE register setting (01b = PH/EN and 10b = PWM) on SPI interface variants or the MODE pin (Level 2 = PH/EN and Level 3 = PWM) on H/W interface variants. The PH/EN mode allows for the H-bridge to be controlled with a speed/direction type of interface commanded by one PWM signal and one GPIO signal. The PWM mode allows for the H-bridge to be controlled with a more advanced scheme typically requiring two PWM signals. This allows the H-bridge driver to enter four different output states for additional control flexibility if required.

The DRV8714-Q1 PWM inputs pins (IN1/EN1, IN2/PH1, IN3/EN2, IN4/PH2) are used to set the PWM frequency and duty cycle for the assigned output. If PWM control is not required, the two h-bridge gate drivers can be controlled directly through the SPI control registers. The INx/ENx and INx/PHx SPI control can be enabled through the INx/ENx_MODE and INx/PHx_MODE register settings. Each H-bridge can be individually set to Hi-Z through the HIZ register setting.

The default active freewheeling mode is active low-side. The DRV8714-Q1 SPI interface variants provide the ability to configure the freewheeling state through the FW register setting. This setting can be utilized to modify the bridge between low-side or high-side active freewheeling. The H/W interface variants default to low-side freewheeling.

The PH/EN control logic and output states for the gate drivers are shown in Table 7-9 and Table 7-10.

Table 7-9 PH/EN H-Bridge (1 / 2) Control
INPUTOUTPUT
IN1/EN1IN2/PH1FW1HIZ1GH1GL1GH2GL2SH1SH2DESCRIPTION
0X0b0LHLHLLLow-Side Active Freewheel
0X1b0HLHLHHHigh-Side Active Freewheel
10X0LHHLLHDrive SH2 → SH1 (Reverse)
11X0HLLHHLDrive SH1 → SH2 (Forward)
XXX1LLLLHI-ZHI-ZHigh-Impedance
Table 7-10 PH/EN H-Bridge (3 / 4) Control
INPUTOUTPUT
IN3/EN2IN4/PH2FW2HIZ2GH3GL3GH4GL4SH3SH4DESCRIPTION
0X0b0LHLHLLLow-Side Active Freewheel
0X1b0HLHLHHHigh-Side Active Freewheel
10X0LHHLLHDrive SH4 → SH3 (Reverse)
11X0HLLHHLDrive SH3 → SH4 (Forward)
XXX1LLLLHI-ZHI-ZHigh-Impedance

The PWM control logic and output states for the gate drivers are shown in Table 7-11 and Table 7-12

Table 7-11 PWM H-Bridge (1 / 2) Control
INPUTOUTPUT
IN1/EN1IN2/PH1FW1HIZ1GH1GL1GH2GL2SH1SH2DESCRIPTION
00X0LLLLHI-ZHI-ZDiode Freewheel (Coast)
01X0LHHLLHDrive SH2 → SH1 (Reverse)
10X0HLLHHLDrive SH1 → SH2 (Forward)
110b0LHLHLLLow-Side Active Freewheel
111b0HLHLHHHigh-Side Active Freewheel
XXX1LLLLHI-ZHI-ZHigh-Impedance
Table 7-12 PWM H-Bridge (3 / 4) Control
INPUTOUTPUT
IN3/EN2IN4/PH2FW2HIZ2GH3GL3GH4GL4SH3SH4DESCRIPTION
00X0LLLLHI-ZHI-ZDiode Freewheel (Coast)
01X0LHHLLHDrive SH4 → SH3 (Reverse)
10X0HLLHHLDrive SH3 → SH4 (Forward)
110b0LHLHLLLow-Side Active Freewheel
111b0HLHLHHHigh-Side Active Freewheel
XXX1LLLLHI-ZHI-ZHigh-Impedance
GUID-51BB8BA7-815E-47B5-A9F2-0C8E7F359982-low.gifFigure 7-9 H-Bridge Control Example