Svc~ pin – Echelon Series 6000 Chip databook User Manual

Page 81

SVC~ Pin

The SVC~ pin alternates between input and open-drain output at a 76 Hz rate with a 50%

duty cycle. When it is an output, it can sync up to 8 mA for use in driving an LED. When it

is used exclusively as an input, it uses an optional external pull-up to bring the input to an

inactive-high state.
Under control of the Neuron firmware, this pin is used during configuration, installation,

and maintenance of the device containing the Series 6000 chip. The firmware flashes the

LED at a 1/2 Hz rate when the Series 6000 chip has not been configured with network

address information. Grounding the SVC~ pin causes the Series 6000 chip to transmit a

network management message containing its unique 48-bit IEEE MACID and the

application’s program ID. This information can then be used by a network management tool

to install and configure the device. Table 24 lists the state of the Service LED for various

device states. The Neuron firmware samples the SVC~ pin whenever it is not actively

driving the pin low.
A typical circuit for the SVC~ pin LED and push-button is shown in Figure 29. During

reset, the SVC~ pin is pulled high by its internal pull-up resistor.

SVC~

3.3 V

Series 6000 Chip

3.3 V

Broadcast

Drive Out

8 mA Sink

Figure 28. SVC~ Pin Circuit

Table 23. Service LED Behavior during Different States

Device State

State Code

Service LED

Applicationless and

Unconfigured

Unconfigured (but with an

Application)

Flashing

Series 6000 Chip Data Book