ZHCS343C May 2012 – January 2023 DRV2665
PRODUCTION DATA
- 1
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Pin Configuration and Functions
- 6 Specifications
-
7 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Support for Haptic Piezo Actuators
- 7.3.2 Flexible Front End Interface
- 7.3.3 Ramp Down Behavior
- 7.3.4 Low Latency Startup
- 7.3.5 Low Power Standby Mode
- 7.3.6 Device Reset
- 7.3.7 Amplifier Gain
- 7.3.8 Adjustable Boost Voltage
- 7.3.9 Adjustable Current Limit
- 7.3.10 Internal Charge Pump
- 7.3.11 Device Protection
- 7.4 Device Functional Modes
- 7.5 Programming
- 7.6 Register Map
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11Device and Documentation Support
- 12Mechanical, Packaging, and Orderable Information
7.3.11.3 Brownout Protection
The DRV2665 device has on-chip brownout protection. When activated, a reset signal is issued that returns the DRV2665 device to the initial default state. If the voltage regulator VREG goes below the brownout protection threshold (VBOT) the DRV2665 device automatically shuts down. When VREG returns to the typical output voltage (1.75 V), the DRV2665 device returns to the initial device state. The brownout protection threshold, VBOT, is typically at 0.84 V.
There is one exception to this behavior. The brownout circuit is designed to tolerate fast brownout conditions as shown by Case 1 in Figure 7-2. If the VDD ramp-up rate is slower than 3.6 kV/s, then the device can fall into an unknown state. In such a situation, to return to the initial default state the device must be power-cycled with a VDD ramp-up rate that is faster than 3.6 kV/s.
Figure 7-2 Brownout Behavior