AMIS-30585 Ver la hoja de datos (PDF) - ON Semiconductor

Número de pieza

componentes Descripción

Fabricante

AMIS-30585

S-FSK PLC Modem

ON Semiconductor 

AMIS-30585

Figure 3: External Component Connection

The goal of the CDREF capacitance is to put the DC voltage of the received signal at the right level for the internal components. See

also description of the pin REF_OUT.

Table 2: Value of the Resistors and Capacitors

C1

560pF

C2

560pF

R1

82KW

R2

39KW

CDREF

1mF

7.4 Pin 4: REF_OUT

REF_OUT is the analog output pin, which provides the voltage reference used by the A/D converter. This pin must be decoupled from

the analog ground by a 1 mF ±10 percent ceramic capacitance (CDREF). This must be done as close as possible on the PCB. See

Figure 4. It is not allowed to load this pin with other impedance load.

7.5 Pin 5: M50HZ_IN

M50HZ_IN is the mains frequency analog input pin - 50 or 60Hz. This pin is used to detect the crossing of the zero voltage on one

selected phase. This information is used, after filtering with the internal PLL, to synchronize frames with the mains frequency. In case of

direct connection to the mains, the use of a series resistor of 1MW is advised in order to limit the current flowing through the protection

diodes.

7.6 Pin 6, 19 and 22: IO0, IO1 and IO2

IO0, IO1 and IO2 are general-purpose digital input and output pins. Only the IO2 pin is used – this is an input for the chip. All IOs

support 5V level on the bus (5V safe IO).

When used as outputs, they must be able to deliver the 5V on the bus if necessary. Outputs are open drain NMOS. The high level is

created by opening the internal open drain MOS. The 5V level is obtained by the use of an external pull-up resistance. Figure 4 gives a

representation of a 5V safe IO. A typical value for the pull-up resistance “RES” is 10KW. With a larger value for “RES”, the current

flowing through this resistance is reduced, hence the switch time from 0V up to 5V. IO2 pin is used as T_REQ signal, i.e. the

transmission request. So this pin is used as an input pin for the chip in the normal working mode. This signal is used in order to initiate

a local communication from the microcontroller to the AMIS-30585. The T_REQ signal is active when low. IO0 and IO1 are assigned to

drive external LED. The embedded software defines pin activation.

Rev. 2 | Page 6 of 23 | www.onsemi.com

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