Power Arrangement

The DS1206N "-RS" and "-TM" devices have an onboard "12V"-to-3.3V switching regulator. Conventionally, the power is supplied through the power jack. The power Jack of the DS1206N accepts "small" power connectors with a 3.5mm diameter. Use the APR-P0011, APR-P0012, or APR-P0013 power adapter supplied by Tibbo or a similar adapter with a 12V nominal output voltage. The adapter current rating should be at least 500mA. On the power jack, the ground is "on the outside," as shown in the figure below.

A diagram of a 3.5mm-diameter power jack.

Alternatively, the DS1206N-RS can be powered through pin 9 of the DB9M (RS232) connector, while the DS1206N-TM can be powered through pin 2 of the TTL interface connector. Two internal diodes combine the power jack and pin 9 (pin 2) inputs into a single line, which goes to the internal regulator of the DS1206N.

On the DS1206N-RS, pin 9 of the DB9M connector can also be used to provide "12V" power to an attached serial device. "12V" actually means "input power on the power jack," which is not necessarily stabilized. The power line of the jack passes through a software-controlled switch and is then connected to pin 9 through a Schottky diode (shown in the diagram below). Therefore, the voltage on pin 9 is close to the input voltage on the power jack.

A diagram illustrating the power arrangement for the "-RS" and "-TM" variants of the DS1206N

The serial-over-IP application supplied with the DS1206N has a dedicated "PS" ("Power on pin 9") setting to control the power switch. To turn the power switch on from within your Tibbo BASIC/C application, enable (configure as output) the PL_IO_NUM8_PWROUT line and then set this line to HIGH. For additional information, see the io. object and the DS1206 programming platform.

If you want to use pin 9 to power an attached serial device, then you must power the DS1206N-RS itself through the power jack. We know you understand this, but we still had to mention it.

The DS1206N-TS does not have a "12V"-to-3.3V regulator. The 3.3V power required for board operation must be supplied by the external device through pin 1 of the TTL interface connector.

The DS1206N "-TM" and "-TS" boards do not have the power switch.