ZHCSBK4G March 2013 – March 2019
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 Detailed Description
- 7.1 Overview
- 7.2 Functional Block Diagram
- 7.3
Feature Description
- 7.3.1 Maximum Power Point Tracking
- 7.3.2 Battery Undervoltage Protection
- 7.3.3 Battery Overvoltage Protection
- 7.3.4 Battery Voltage within Operating Range (VBAT_OK Output)
- 7.3.5 Storage Element / Battery Management
- 7.3.6 Programming OUT Regulation Voltage
- 7.3.7 Step Down (Buck) Converter
- 7.3.8 Nano-Power Management and Efficiency
- 7.4 Device Functional Modes
- 8 Application and Implementation
- 9 Power Supply Recommendations
- 10Layout
- 11器件和文档支持
- 12机械、封装和可订购信息
7.3.4 Battery Voltage within Operating Range (VBAT_OK Output)
The charger allows the user to set a programmable voltage independent of the overvoltage and undervoltage settings to indicate whether the VSTOR voltage (and therefore the VBAT voltage when the PFET between the two pins is turned on) is at an acceptable level. When the battery voltage is decreasing the threshold is set by Equation 3:
When the battery voltage is increasing, the threshold is set by Equation 4:
The sum of the resistors is recommend to be no higher than approximately i.e., ROK1 + ROK2 + ROK3= 13 MΩ. Spreadsheet SLUC484 provides help on sizing and selecting the resistors. The logic high level of this signal is equal to the VSTOR voltage and the logic low level is ground. The logic high level has ~20 KΩ internally in series to limit the available current in order to prevent MCU damage until the MCU is fully powered. The VBAT_OK_PROG threshold must be greater than or equal to the UV threshold.