ARDUPILOT MEGA APM2.52 APM Flight Controller Board

product description
Features:

This is the new APM 2.8 autopilot module, upgrade version 2.5 2.6.
In the V2.52 version of the older 1.0mm 6P SM06B GPS interface, the I2C interface puts the external compass DF13-4P, DF13-5P GPS interface and external compass interface together for easier GPS and external compass.
The original DF13-5P GPS interface and SM06B GPS interface reuse, there is no point.
There are compasses on this version of the board. V2.8 Improved design with jumper selection, MAG mark on PCB pins (near GPS connector), jumper cap with built-in compass and unplugged jumper cap from external compass.
One of the first open source autopilot systems using Invensenses six DoF accelerometer / gyroscope MPU-6000.
V2.52 version of the 3.3V power supply using TPS79133, rated output capability of only 100mA, also need 6 (including onboard compass, gyroscope, pressure gauge and three logic level shifter) IC power supply, lack of power supply, And because the TPS79133 is a low-voltage enable, you can not use other LDO chips instead. The new version V2.8.0 uses Micrel MIC5219-3.3, the output capacity of 500mA. In order to strengthen the ability of 3.3V output, it is possible to reduce some problems due to the healthy probability of poor voltage gyroscope.
The I2C V2.52 interface MUX interface multi-function, the interface output by the user, via UART0, UART2, I2C, OSD optional board behind the free allocation of functional pads, the default OSD interface, in order to avoid the 2.52 version of the same time using digital And OSD, you need to use the Y line interface separation scheme. OSD interface and improved data transmission at the same time, due to the role of isolation resistance, effectively avoiding interference from the log.