Data Sheet

Bluegiga Technologies Oy
Page 8 of 52
2 APx4 pin descriptions
The APX4 connector uses a standard DDR1 SO-DIMM connector with 2.5V keying.
 Odd numbered pins are located on top layer
 Even numbered pins are located on bottom layer
There is a ½ pitch (0.3mm) offset from top layer pins to bottom layer pins.
Note that most receptacles also have 0.3mm offset from odd pins to even pins.
2.1 Receptacle
Suitable receptacles are available from multiple vendors. For example TE Connectivity’s part number
1473005-1, Mouser part number: 571-1473005-1 and Digi-Key’s part number: A99605-ND.
PCB footprint and schematic symbol for the mentioned part number will be available for download
from Techforum in Mentor Graphics’ PADS format.
2.2 Power contacts on the left side
In addition to the 200 pins/finger contacts there are two pairs of plated through holes on the left side of the
module which can be used for powering the module stand-alone (not assembled on any motherboard). The
pitch between the holes is 2.54mm. Leave the holes unconnected if the module is assembled on a
motherboard.
Name
Function
GND
Ground
VIN
+5V input
GND
Ground
VBATTERY
Battery positive input/output
Table 1: Power supply pins
2.3 Debug UART on the right side
On the right side there are four plated through holes for PWM or debug port stand-alone (not assembled on
any motherboard). The vertical distance between the holes is 1.27mm:
Name
Function
3V3
3.3V output (for current limits, see Table 50)
PWM1/DUART TxD
Debug UART data transmit, logic level 3.3V
PWM0/DUART RxD
Debug UART data receive, logic level 3.3V
GND
Ground
Table 2: Debug UART pins