SLUUCK2A October   2022  – November 2022 BQ25620 , BQ25622

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 General Descriptions
  4. 2Testing Procedures
    1. 2.1 Equipment
    2. 2.2 Hardware Setup
    3. 2.3 Software Setup
    4. 2.4 Test Procedure
      1. 2.4.1 Initial Power Up
      2. 2.4.2 I2C Register Communication Verification
      3. 2.4.3 Charger Mode Verification
      4. 2.4.4 Boost Mode Verification
      5. 2.4.5 Helpful Tips
  5. 3PCB Layout Guideline
  6. 4Board Layout, Schematic, and Bill of Materials
    1. 4.1 Board Layout
    2. 4.2 Schematic
    3. 4.3 Bill of Materials
  7. 5Revision History

1.2 General Descriptions

Table 1-2 lists the input and output connections available on this EVM and their respective descriptions.

Table 1-2 EVM I/O Connections
TerminalDescription
J1(2) - VINPositive rail of the charger input voltage
J1(1) - GNDGround
J2(1) - SYSTEMPositive rail of the charger system output voltage, typically connected to the system load
J2(2) - GNDGround
J3(1) - VPBPositive rail of the charger output voltage for power bank applications in reverse boost mode (OTG). This output also shares the rail with the VIN input rail in forward buck mode
J3(2)-GNDGround
J4(3) - BATTERYPositive rail of the charger battery input, connected to the positive terminal of the external battery
J4(2) - ext_tsConnection available for external thermistor if required
J4(1) - GNDGround
J5Input source Micro B USB port
J6I2C connector for the USB2ANY interface board
J7I2C connector for the EV2400 interface board

Table 1-3 lists the jumper and shunt installations available on this EVM and their respective descriptions.

Table 1-3 EVM Jumper Shunt and Switch Installation

Header

DescriptionBQ25620 SettingBQ25622 Setting
JP1

Not applicable

Not InstalledNot Installed
JP2SCL pull-up rail. Not required if using EV2400 or USB2ANYNot InstalledNot Installed
JP3SDA pull-up rail. Not required if using EV2400 or USB2ANYNot InstalledNot Installed
JP4Not applicableNot InstalledNot Installed
JP5BQ25620EVM: Not applicable.BQ25622EVM: Connects ILIM pin resistor to ILIM pin.Not InstalledNot Installed
JP6BQ25620EVM: Micro B USB input D- connection to charger D- pin BQ25622EVM: Not applicable.InstalledInstalled
JP7PG pin LED indicator connection. On PG enabled chargers, this indicates the Power Good statusInstalledInstalled
JP8STAT pin LED indicator connection. This indicates the current charger statusInstalledInstalled
JP9BQ25620EVM: Micro B USB input D- connection to charger D- pin BQ25622EVM: Not applicable.InstalledInstalled
JP10Used to connect USB2ANY SDA and SCL lines to a power rail on the PCB.Not InstalledNot Installed
JP11BQ25620EVM: TS resistor divider pull-up rail to REGN. BQ25622EVM: TS resistor divider pull-up rail to TS_BIAS. Short pins 1-2Short pins 2-3
JP12BQ25620EVM: Charger D+ pin and charger D- pin short connection. Connect this on D+/D- detection enabled chargers to simulate the connection of a DCP-type USB port as defined by USB BC1.2 and set IINDPM register to highest setting. BQ25622EVM: Not applicable.InstalledNot Installed
JP13Connect 10 kohm in parallel with TS resistor network to simulate a battery at 25 C. Disconnect if using external thermistor. InstalledInstalled
JP14CE pin connection to ground to enable charging. When removed, CE pin pulls up to SYS through 10 kohm to disable chargeInstalledInstalled
JP15Not applicableNot InstalledNot Installed
S1QON control switch. Press either for exiting Shipping Mode or System Reset.Default OffDefault Off

Table 1-4 lists the recommended operating conditions for this EVM.

Table 1-4 Recommended Operating Conditions
SymbolDescriptionMinTypMaxUnit
VVBUS, VVACInput voltage applied to VBUS pin3.918.0V
VBATBattery voltage applied to BAT pin04.2084.8V
IVBUSInput current into VBUS03.2A
ISWOutput current from SW flowing to SYS pin load and battery at BAT pin3.5A
IBATFast charging current into battery at BAT pin0

3.5

A
Continuous RMS discharge current through internal BATFET6A