Radioberry In and Output

In and Output uses the Connector CN301.

Take care, signals are not buffered and are directly connected to the FPGA.

Pin connections

function	fpga	Pin	Pin	fpga	function
5V	-	1	2	-	3V3
ptt_out / preamp exttr	144	3	4	143	preamp inttr
RPI-Keyer-dash (pihpsdr)	142	5	6	141	RPI-Keyer-dot (pihpsdr)
preamp bias	137	7	8	136	preamp envpa
no use	135	9	10	133	no use
no use	132	11	12	125	no use
push-to-talk (in)	121	13	14	120	key input
reserved for fpga SDA	119	15	16	115	reserved for fpga SCL
SDA from J8 RPI	pi	17	18	pi	SCL from J8 RPI
Ground	-	19	20	-	Ground

images/radioberry-cn301.PNG

Remarks

The keyer connections are using a weak pull up of the FPGA; as said be carefull... direct connection with FPGA.

There are 3 filter boards , controlled via i2c, supported:

Alex board using address 0x21 ; PCA9555 i2c chip
Generic filter board by VA2SAJ using address 0x22 ; Arduino filter board interface switcher address for VA2SAJ Generic Filter Switching Board
N2ADR board using address 0x20

Pin 9 and 10 ; reqular IO or adding LVDS if termination is required place R306

Pin 11 and 12; reqular IO or adding LVDS if termination is required place R305

Pin 13 and 14; by placing R307 and R308 (or using the FPGA internal pull up) makes fast io or i2c extension possible. But for now the dot and dashes for cw keyer.

Pin 15 and 16; by placing R303 and R304 (or using the FPGA internal pull up) makes fast io or i2c extension possible.