pHAT Module Series

pHAT-RV Technical Description

pHAT-RV Technical Description

Page 12 of 27

3.6 Power Supply

3.6.1 Lithium Battery

The RV provides a Deans XT60 socket to connect to a 7.4V Lithium-Ion battery pack with a

minimum capacity of 2000mA/h (2A/h).

WARNING: A Lithium-Ion or Lithium-Polymer battery is capable of

delivering very high levels of power to the servo and stepper motors.

This can cause a significant amount of heat to be generated in the

motor which may cause the motor to fail if the motor is stalled.

To help to prevent motor damage fuse resistors R1, R4 and R5 have been included that will go

open circuit if significant levels of current are drawn by the motors. These can be replaced

with zero ohm (0R0) 0805 size resistors if damaged

3.6.2 Charger Input

The Charger Input requires a 9.0 ~ 12VDC @ 2Amp min. supply from an external power

adaptor to charger the Lithium-Ion battery. NOTE: Charging should be undertaken during no

motor activity for best results.

3.6.3 Raspberry-Pi Power

The RV provides a 5.0V supply output to provide the Raspberry-Pi board with power. The

table below describes the module output supply and ground pins.

Table 2: Power Supply Pins

Pin Name

Pin No

Description

Min

Typ.

Max

Unit

5V

2, 4

Power Supply

Output @ 1A

5.0

V

Ground

6,9,14,20,

25,30,34,

39

Power Ground

If Raspberry-Pi power is not required jumper link JP1 may be removed with a soldering iron.

Note however that this will invalidate the warranty.