The electronics in the dual 7 amp H-Bridge card work with the logic in a Baseboard FPGA card to form either a dual DC motor controller or a bipolar stepper motor controller.
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Features:
- 7 Amp continuous current
- 12 Amp peak current
- Up to 18 volt input
- High current FET drivers for high frequency PWM
- Modes include Forward, Reverse, Brake, and Coast
When used with the "dc2" peripheral this interface card can provide direction, PWM speed control, and both brake and coast for two motors. The card uses four pins from the FPGA, two pins for each motor. The outputs are labeled 1 and 2 on the card. The table below shows the translation of the inputs input pin values to modes.
INPUT MODE OUT1 OUT2
00 Coast low low
01 Forward low (PWM)
10 Reverse (PWM) low
11 Brake high high The power-on default
When used with the polar stepper controller peripheral ("stepb") this interface card can provide direction, step rate, step count, and holding current for a bipolar stepper motor with a current rating of up to 7 amps and a voltage rating of up to 18 volts.
Hardware:
The schematic of the D7HB is shown below. The Eagle schematic and board
files are available here: d7hb.sch and d7hb.brd.
