Digi BL1800 user manual PE0 VCC HV0 SM1 SM0 HV2 Stat

Once the LEDs, resistors, and switches are disconnected as described above, the user has a Jackrabbit board with connection points conveniently brought out to labeled points at headers J3 and J7 on the Prototyping Board. Small to medium circuits can be prototyped using point- to-point wiring with 20 to 30 AWG wire between the prototyping area and the holes at loca- tions J3 and J7. Note that the pinouts at locations J3 and J7 on the top side of the Prototyping Board (shown in Figure B-7) are a mirror image of the Jackrabbit board pinouts.

VCC PA1 PA3 PA5 PA7

GND PB1 PB3 PB5 PB7

PCLK PE7 PE5 PE3 PE1

GND HV1 HV3 +RAW

VCC

J3		J7
GND	GND	VCC
PA0	RXC	RXB
PA2	TXC	TXB
PA4	PC1	PC0
PA6	PC3	PC2
GND	PC5	PC4
PB0	PC7	PC6
PB2	AGND	AD0
PB4	DA1	DA0
PB6	PD1	PD0
WDO	PD3	PD2
GND	PD5	PD4
PE6	PD7	PD6
PE4	GND	GND
PE2	485+	485–
PE0	VCC	VCC
HV0	SM1	SM0
HV2	STAT	IOBEN
K	VBAT	GND
GND	GND	/RST

Figure B-7. Jackrabbit I/O Pinout on Prototyping Board (top side)

A user-supplied DE9 connector can be added as shown in Figure B-3.The signals are brought out to location J5 on the top side of the Prototyping Board.

There are six independent surface-mount 14- to 16-pin SOIC pads and fourteen 3- to 5-pin SOT23 pads. Each component has every one of its pin pads connected to a hole in the pro- totyping area. The layout is such that there is another SOIC or SOT23 pad directly on the other side of the PCB from the SOIC or SOT23 pads. However, each layout location is routed to its unique set of connection holes. Because the traces are very thin, carefully determine which set of holes is connected to which surface-mount pad. There are several standard 0805 passive-component surface-mount pads. These pads are not routed to wir- ing holes so wire must be soldered directly to the component. In addition, there is a large generic array of wide traces connected to large holes. This is provided as an additional area for surface-mount passive components. There is a moderate amount of 0.1” arrayed through-hole prototyping area (about 137 holes) for mounting through-hole components.

Thus, many circuits requiring special circuitry external to the Jackrabbit can be prototyped and tested with the Prototyping Board. If additional prototyping space is needed, install 40-pin headers at locations J3 and J7 on the top side of the Prototyping Board to connect to sockets that you would install at J3 and J7 on the top side of a second Prototyping Board.

User’s Manual 77