Detailed Device Info
The EM1206 has three connectors: main connector, additional connector, and magnetics connector. Depending on the EM1206 version, the magnetics connector can be soldered facing up or down, as described in the Mechanical Dimensions topic.
![A diagram illustrating the pin assignments of the EM1206.](./images/em1206_pin_assn.png)
Main Connector
Pin # |
Function |
Description |
1 |
VCCB |
Backup power for the real-time counter. Do not connect to 3.3V directly! |
2 |
MD |
Mode selection pin. |
3 |
RST |
Reset line, active high. |
4(1,2,3) |
GPIO5/P0.5/TX2/INT5 |
General-purpose I/O line 5 (P0.5); TX, W1, dout output of the serial port 2; Interrupt line 5. |
5(1,2,3) |
GPIO4/P0.4/RX2/INT4 |
General-purpose I/O line 4 (P0.4); RX, W1, din input of the serial port 2; Interrupt line 4. |
6(1,2,3) |
GPIO6/P0.6/RX3/INT6 |
General-purpose I/O line 6 (P0.6); RX, W1, din input of the serial port 3; Interrupt line 6. |
7(1,2,3) |
GPIO7/P0.7/TX3/INT7 |
General-purpose I/O line 7 (P0.7); TX, W1, dout output of the serial port 3; Interrupt line 7. |
8 |
VCC |
Positive power input, 3.3V nominal, ±5%, max. current consumption 230mA (100BaseT, PLL on). |
9 |
GND |
System ground. |
10(1,2,3) |
GPIO0/P0.0/RX0/INT0 |
General-purpose I/O line 0 (P0.0); RX, W1, din input of the serial port 0; Interrupt line 0. |
11(1,2,3) |
GPIO1/P0.1/TX0/INT1 |
General-purpose I/O line 1 (P0.1); TX, W1, dout output of the serial port 0; Interrupt line 1. |
12(1,2,3) |
GPIO2/P0.2/RX1/INT2 |
General-purpose I/O line 2 (P0.2); RX, W1, din input of the serial port 1; Interrupt line 2. |
13(1,2,3) |
GPIO3/P0.3/TX1/INT3 |
General-purpose I/O line 3 (P0.3); TX, W1, dout output of the serial port 1; Interrupt line 3. |
- This line is 5V-tolerant and can be interfaced to 5V CMOS devices directly.
- This line can serve as an RTS/Wout/cout line of a serial port (provided that this does not interfere with any other function).
- This line can serve as a CTS/W0&1in/cin line of a serial port (provided that this does not interfere with any other function).
Additional Connector
Pin # |
Function |
Description |
1 |
SG |
Green status LED control line. |
2 |
SR |
Red status LED control line. |
3(1,2) |
GPIO16/CO |
General-purpose I/O line 16 (does not belong to any port); square wave output line. |
4(1,2) |
GPIO8/P1.0 |
General-purpose I/O line 8 (P1.0). |
5(1,2) |
GPIO9/P1.1 |
General-purpose I/O line 9 (P1.1). |
6(1,2) |
GPIO10/P1.2 |
General-purpose I/O line 10 (P1.2). |
7(1,2) |
GPIO11/P1.3 |
General-purpose I/O line 11 (P1.3). |
8(1,2) |
GPIO12/P1.4 |
General-purpose I/O line 12 (P1.4). |
9(1,2) |
GPIO13/P1.5 |
General-purpose I/O line 13 (P1.5). |
10(1,2) |
GPIO14/P1.6 |
General-purpose I/O line 14 (P1.6). |
11(1,2) |
GPIO15/P1.7 |
General-purpose I/O line 15 (P1.7). |
- This line is 5V-tolerant and can be interfaced to 5V CMOS devices directly.
- This line can be assigned to serve as an RTS/Wout/cout line of a serial port.
Magnetics Connector
Pin # |
Function |
Description |
1 |
RX+ |
Ethernet port, positive line of the differential input signal pair. |
2 |
RX– |
Ethernet port, negative line of the differential input signal pair. |
3 |
AVCC |
"Clean" 1.8V power output for magnetics circuitry. |
4 |
--- |
--- |
5 |
--- |
--- |
6 |
AGND |
Analog ground. |
7 |
TX+ |
Ethernet port, positive line of the differential output signal pair. |
8 |
TX– |
Ethernet port, negative line of the differential output signal pair. |
Additional Resources
See these topics for more information on various hardware facilities of the EM1206:
- General-Purpose I/O Lines
- Ethernet Port Lines
- Serial Ports
- Square Wave Generator
- Flash Memory and EEPROM
- Real-Time Counter
- LED Lines
- Power, Reset, and Mode Selection Lines