B.3.1 Demonstration Board
A relay, a thermistor, four additional LEDs, and a serial cable are included in a bag of parts to further allow exploration of the Jackrabbit‘s operation.
The SPDT relay handles 120 V at 5 A with a 12 V activating coil. The layout to accept this relay is included on the top side of the Prototyping Board. Note that the relay coil connec- tions need to be wired to one of the sinking
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| Relay |
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| +12 V to COIL(+) |
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| HVx to |
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| K to +RAW |
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[COIL(+) and |
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| Bottom Side |
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| is 0.1" (2.5 mm)] |
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| COIL(+) | VCC | +RAW | HV3 | HV1 | GND | PE1 | PE3 | PE5 | PE7 | PCLK | PB7 | PB5 | PB3 | PB1 | GND | PA7 | PA5 | PA3 | PA1 | VCC | J3 |
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PE4 | +RAW | JP2 HV0 |
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| PA6 |
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POT |
| GND | K |
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| PA4 | PA2 | PA0 | GND |
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| GND | PB5HV0 | PE0PB4 | PE2PB3 | PE4PB2 | PA7PE6 | PA6GND | PA5WDO | PA4PB6 | PA3PB4 | PA2PB2 | PA1PB0 | JP1 PA0GND |
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PD0 | AD0 | K | BZR VCC |
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| GND | S4 | S3 | S2 | S1 | DS8 | DS7 | DS6 | DS5 | DS4 | DS3 | DS2 | DS1 |
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| 1 | J4 |
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| 5 |
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| COM N.O. | N.C. |
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| GND |
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| J1 |
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| RXB | TXC |
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| VBAT | STAT | SM1 | VCC | 485+ | GND | PD7 | PD5 | PD3 | PD1 | DA1 | AGND | PC7 | PC5 | PC3 | PC1 | TXC | RXC |
| TXB | RXC |
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| GND | GND |
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| /RST | GND | IOBEN | SM0 | VCC | 485- | GND | PD6 | PD4 | PD2 | PD0 | DA0 | AD0 | PC6 | PC4 | PC2 | PC0 | TXB | RXB | VCC | J7 |
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Relay Contacts
[0.156" (4 mm) spacing]
Figure B-4. Installation of Relay on Prototyping Board
NOTE: COIL(+) must be connected to a 12 V power supply when using the relay. This is the nominal voltage supplied as +RAW when the transformer supplied with the Development Kit is used, and in this case you may connect COIL(+) to +RAW. If you use another power supply, connect COIL(+) to +12 V if +RAW is different.
NOTE: If you do use the transformer supplied with the Development Kit for COIL(+), be aware that its voltage may be as high as 16 V at low current draws. This needs to be taken into consideration if you plan to use a 12 V relay in critical applications.
74 | Jackrabbit (BL1800) |