P330 Battery Intelligent board

Table of Contents

Function
Variants
Parts
Programming
External interfaces
Service interfaces
Board view
Schematics

Function

DJI Intelligent Flight Battery for P2 is a 5600mAh, 11.1V LiPo 3S battery, supporting up to 25 minutes of flight time. The battery also has built-in sensors and LEDs that let you know the status and remaining power.

The battery management system chip communicates with Naza Flight Controller using SMBus protocol, which in turn is deviced from I2C.

Variants

There are multiple versions of the board.

Marking	Overview
DJI07 V12 20130929
DJI07 V13 20131028

Parts

Version DJI07 V13 components

Marking	Amt.	Pkg.	Function	Specification
BM3328	1	LQFP-48 7x7mm	2-4 Cells Lithium Battery Gas Gauge Management and Protection IC
TPS1AH FDMS	4		N-channel power MOSFET; markings uncertain

Programming

Chips	Firmware	Description
unknown	m1100

External interfaces

Connectors on the board are:

Marking	Overview
P- High Current Soldering Pads	Power output wire of the battery
B- High Current Soldering Pads	Battery cells connection
TS Soldering Pads	Temperature sensor connection
6-pin Balancer and comms con.	Contains connections for cells balancing, plus wires for the communication interface connected to Naza FC.

Service interfaces

The following service pads exist on this board:

Marking	Overview
TODO

Board view

Top of a DJI07 V12 board:

Bottom of the DJI07 V12 board:

Top of another DJI07 V13 board:

Bottom of the DJI07 V13 board:

Schematics

Functional diagram

flowchart LR
    Connector-BAT((batt<br/>connec<br/>tor))
    subgraph Battery Intelligent board
    direction LR
    BatteryBMS[BM3318 BMS<br/>Lithium pack<br/>manager]
    BattFeedbackR(0.02 Ohm<br/>feedback<br/>resistor)
    BatteryButton(button)
    BatteryLEDs(LED line)
    BatteryBMS---BatteryButton
    BatteryBMS---BatteryLEDs
    ChargeDischargeFET(MOSFET<br/>charge<br/>discharge<br/>control)
    BattFeedbackR===ChargeDischargeFET
    BatteryBMS---ChargeDischargeFET
    end
    subgraph Li-Po cells pack
    direction TB
    BatteryCell1(battery<br/>cell 1)
    BatteryCell2(battery<br/>cell 2)
    BatteryCell3(battery<br/>cell 3)
    BatteryTempSense(thermistor)
    BatteryCell1===BatteryCell2
    BatteryCell3===BatteryCell2
    end
    ChargeDischargeFET===BatteryCell1
    Connector-BAT== PACK- ===BattFeedbackR
    BatteryBMS-- VSS ---BatteryCell1
    BatteryBMS---BatteryCell2
    BatteryBMS---BatteryCell3
    BatteryBMS-- SR ---BattFeedbackR
    BatteryBMS-- TS ---BatteryTempSense
    Connector-BAT== PACK+ ===BatteryCell3
    Connector-BAT-- SMBus ---BatteryBMS

Loading

Thick lines are the ones transferring high power. Feedback resistor for measuring current, as well as all MOSFET switchesm are inserted into negative line. The three Li-Po cells are connected in series, so that the voltage sums up.

The Battery Management System chip communicates with FC using the protocol described in Smart Battery Specification, over SMBus interface. It is uncertain whether there are any DJI-specific extensions to the protocol. The charge level, as well as errors spotted by the BMS, can be shown on attached line of four LEDs. The BMS can also read button state, and based on that, start or shutdown the power delivery.

Hardware schematics

No schematics available.