Requirements
2-4
AT91CAP9-STK Starter Kit User Guide
6351B–CAP–27-Jun-08
2.3
External Interfaces
2.3.1
EI1: External Lithium-ion Battery
The AT91CAP9-STK board implements one external Li-Ion battery 3-pin HE14 type connector..
2.3.2
EI2: 5VAC/DC Sector Adapter
CAP9-STK board implements one RAPC722 Switchcraft right angle miniature power jack with the follow-
ing electrical characteristics:
Contact resistance: 30 m
Ω
max
Current carrying capability: 5A
2.3.3
EI3: RMII 10/100 Base-T Ethernet
An RJ45 8-pin Integrated Magnetics Connector is implement for the 10/100 Base-T Ethernet interface.
The connector integrates a 1 nF capacitor for HF shielding of the signal with chassis ground. (External
connection between chassis and electrical ground is possible too.)
2.3.4
EI4: Serial Port, Connected to the Debug Unit
A Debug right angle SUBD-9 connector is available in order to communicate with the AT91CAP9 micro-
controller debug unit. This port is an electrical RS232 type connection. The connector integrates 2
additional pins (10, 11) for signal shielding.
Table 2-1. HE 14-3 Pinout
Pin
Signal Name
Description
Type
Level
1
VBAT
Battery power
I/O
4,5V
2
GND
Electrical ground
O
-
3
BAT_TS
Thermistor
temperature sense
I
4,5V
Table 2-2. RJ45-8 Pinout
Pin
Signal Name
Description
Type
1
TX+
Positive differential emission
O
2
TX-
Negative differential emission
O
3
RX+
Positive differential reception
I
6
RX-
Negative differential reception
I
4, 5, 7, 8
NC
-
-
Table 2-3. SUBD-P Pinout
Pin
Signal Name
Description
Type
Level
2
RXD
RS232 receive
I
±30V
3
TXD
RS232 transmit
O
±5V to ±5.2V
5, 10, 11
GND
Electrical ground
-
-
1, 4, 6, 7, 8, 9
NC
-
-
-