Data Sheet

Bluegiga Technologies Oy
Page 28 of 52
6 Peripheral interfaces
The module allows for several kinds of different interfaces to peripherals to be used.
6.1 Ethernet
Pin#
Function
Net name
19
Ethernet TX -
ETN_TXN
20
GND
GND
21
Ethernet TX +
ETN_TXP
22
3.3V output
3V3
23
Ethernet RX -
ETN_RXN
24
Ethernet LED
ETN_LED1N
25
Ethernet RX +
ETN_RXP
26
GND
GND
Table 32: Ethernet pins
The Ethernet I/O lines are connected on the module to a standard 10Base-T/100Base-TX physical layer
transceiver (PHY). A connector board will only need to have the magnetics as well as an RJ45 jack in order to
have fully functioning Ethernet. Multiple vendors also supply RJ45 jacks with integrated magnetics under
brand names such as MagJack and PulseJack which further simplify design. A reference schematic for such a
design is available in the APx4 reference design.
When routing the Ethernet signals, care should be taken to route the differential signals together, meaning
that for example ETN_TXN and ETN_TXP should be kept close together. The traces must also be kept short
in order to avoid EMC issues.
The Ethernet LED pin (ETN_LED1N) indicates link and activity and has a maximum output drive current of 8
mA. The ETN_LED is high when no Link is present (typically connected so that a physical LED is off), low
when a Link is present (physical LED on) and toggled on activity (physical LED is blinking).
Make sure that the driving capability of 8mA is not exceeded.
Pin state
LED
Meaning
HIGH
Off
No Link
LOW
On
Link
Toggle
Blinking
Activity
Table 33: ETN_LED1N pin
Figure 4 Typical external LED connection