1.2 I/O Descriptions
table lists the BQ2579XEVM board connections and ports.
Table 1-2. EVM Connections
Connector, Port
Description
J1
VIN1
Positive rail of the priority input adapter or power supply
GND
Ground
J2
VIN2
Positive rail of the secondary input adapter or power supply
GND
Ground
J3
SYSTEM
Positive rail of the charger system output voltage, typically connected to the system load
GND
Ground
J4
VPMID
Positive rail of the charger output voltage for reverse mode (OTG). This output also shares the rail with
VBUS in forward mode
GND
Ground
J5
BATTERY
Positive rail of the charger battery input
SNS_BATP
Input connected to the positive terminal of the battery for remote battery voltage measurement
GND
Ground
J6
USB port
USB Micro B port used for input source type detection and handshaking. Connected to either VIN1 or
VIN2
J7
EXTERNAL
THERMISTOR
Input connected to an external battery temperature sensing thermistor
GND
Ground
J8
Communication port
I
2
C communication port for use with the EV2300/2400 Interface Board
J9
Communication port
I
2
C communication port for use with the USB2ANY Interface Adapter (for future use)
lists the shunt installations available on the EVM, and their respective descriptions.
Table 1-3. EVM Shunt and Switch Installation
Shunt
Description
BQ25792/6/8 Setting
JP1
ACDRV1 pin connection to control ACFET1-RBFET1. Connect this to _acdrv1 net (labeled
VAC1 FET) when utilizing the input protection MOSFETs. Connect this to GND when input
protection MOSFETs are not used or bypassed
ACDRV1 to VAC1 FETs (short
pins 1 to 2)
JP2
ACDRV2 pin connection to control ACFET2-RBFET2. Connect this to _acdrv2 net (labeled
VAC2 FET) when utilizing the input protection MOSFETs. Connect this to GND when input
protection MOSFETs are not used or bypassed
ACDRV2 to VAC2 FETs (short
pins 1 to 2)
JP3
VIN1/VAC1 to VBUS bypass connection. Connect this when the input protection MOSFET
feature is not desired. This connects the input source on VIN1 to VBUS.
Not Installed
JP4
VIN2/VAC2 to VBUS bypass connection. Connect this when the input protection MOSFET
feature is not desired. This connects the input source on VIN2 to VBUS.
Not Installed
JP5
BAT to BATTERY bypass connection. Connect this when the ship and shutdown mode
features are not desired and JP8 pins 1 and 2 are shorted.
Not Installed
JP6
USB Micro B input D– connection to charger D- pin. Connect this when the input source
detection and handshake features are desired.
Installed
JP7
USB port J6 positive rail to charger VBUS selection. Use shunt to select either VIN1/VAC1 or
VIN2/VAC2 as the connection for the USB port.
USB_VIN to VAC1
JP8
SDRV pin connection to control SFET. Short pins 1 to 2 of JP8 and install shunt across JP5
when ship and shutdown mode features are not desired. Short pins 2 to 3 of JP8 and remove
shunt from JP5 when ship and shutdown mode features are desired.
Short pins 2 to 3
JP9
BATP pin connection. BATP is always connected to J5 pin 2 for remote battery sense. If
off-board remote sense is not used, short pin 2 to J5 pin 1 (BATTERY) for the charger constant
voltage sensing to occur at the J5 connector after the Q5 ship mode FET Short pin 2 to pin 3
(BAT pin) for the charger constant voltage sensing to occur on the PCB board close to the IC
before Q5 ship mode FET. Do not leave BATP pin floating.
Short pin 2 to J5 pin 1
(BATTERY)
JP10
Charger D+ and D- pin short connection. Connect this to simulate a DCP type adapter for the
input source detection and handshake feature. Remove in order to use the charger's D+/D-
detection feature.
Installed
Introduction
4
BQ25792EVM, BQ25798EVM and BQ25798BKUPEVM (BMS034) Evaluation
Module
SLUUCB5E – JUNE 2020 – REVISED JULY 2022
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