ZHCSGD8A May 2017 – May 2018
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 說明 （續）
- 6 Pin Configuration and Functions
- 7 Specifications
-
8 Detailed Description
- 8.1 Overview
- 8.2 Functional Block Diagram
- 8.3
Feature Description
- 8.3.1 Power-Up from Battery Without DC Source
- 8.3.2 Power-Up From DC Source
- 8.3.3 USB On-The-Go (OTG)
- 8.3.4 Converter Operation
- 8.3.5 Current and Power Monitor
- 8.3.6 Input Source Dynamic Power Manage
- 8.3.7 Two-Level Adapter Current Limit (Peak Power Mode)
- 8.3.8 Processor Hot Indication
- 8.3.9 Device Protection
- 8.4 Device Functional Modes
- 8.5 Programming
- 8.6
Register Map
- 8.6.1
Setting Charge and PROCHOT Options
- 8.6.1.1 ChargeOption0 Register (I2C address = 01/00h) [reset = E20Eh]
- 8.6.1.2 ChargeOption1 Register (I2C address = 31/30h) [reset = 211h]
- 8.6.1.3 ChargeOption2 Register (I2C address = 33/32h) [reset = 2B7]
- 8.6.1.4 ChargeOption3 Register (I2C address = 35/34h) [reset = 0h]
- 8.6.1.5 ProchotOption0 Register (I2C address = 37/36h) [reset = 04A54h]
- 8.6.1.6 ProchotOption1 Register (I2C address = 39/38h) [reset = 8120h]
- 8.6.1.7 ADCOption Register (I2C address = 3B/3Ah) [reset = 2000h]
- 8.6.2 Charge and PROCHOT Status
- 8.6.3 ChargeCurrent Register (I2C address = 03/02h) [reset = 0h]
- 8.6.4 MaxChargeVoltage Register (I2C address = 05/04h) [reset value based on CELL_BATPRESZ pin setting]
- 8.6.5 MinSystemVoltage Register (I2C address = 0D/0Ch) [reset value based on CELL_BATPRESZ pin setting]
- 8.6.6 Input Current and Input Voltage Registers for Dynamic Power Management
- 8.6.7 OTGVoltage Register (I2C address = 07/06h) [reset = 0h]
- 8.6.8 OTGCurrent Register (I2C address = 09/08h) [reset = 0h]
- 8.6.9 ADCVBUS/PSYS Register (I2C address = 27/26h)
- 8.6.10 ADCIBAT Register (I2C address = 29/28h)
- 8.6.11 ADCIINCMPIN Register (I2C address = 2B/2Ah)
- 8.6.12 ADCVSYSVBAT Register (I2C address = 2D/2Ch)
- 8.6.13 ID Registers
- 8.6.1
Setting Charge and PROCHOT Options
- 9 Application and Implementation
- 10Power Supply Recommendations
- 11Layout
- 12器件和文檔支持
- 13機械、封裝和可訂購信息
9.2.2.1 ACP-ACN Input Filter
The bq25703A has average current mode control. The input current sensing through ACP/ACN is critical to recover inductor current ripple. Parasitic inductance on board will generate high frequency ringing on ACP-ACN which overwhelms converter sensed inductor current information, so it is difficult to manage parasitic inductance created based on different PCB layout. Bigger parasitic inductance will generate bigger sense current ringing which will cause the average current control loop to go into oscillation.
For real system board condition, we suggest to use below circuit design to get best result and filter noise induced from different PCB parasitic factor. With time constant of filter from 47 nsec to 200 nsec, the filtering on ringing is effective and in the meantime, the delay of on the sensed signal is small and therefore poses no concern for average current mode control.
