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L6228QTR Datasheet(PDF) 6 Page - STMicroelectronics |
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L6228QTR Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 32 page Pin connection L6228Q 6/32 Doc ID 14321 Rev 4 Table 4. Pin description N° Pin Type Function 1, 21 GND GND Ground terminals. 9OUT1B Power output Bridge B output 1. 11 RCB RC pin RC network pin. A parallel RC network connected between this pin and ground sets the current controller OFF-time of the bridge B. 12 SENSEB Power supply Bridge B source pin. This pin must be connected to power ground through a sensing power resistor. 13 VREFB Analog input Bridge B current controller reference voltage. Do not leave this pin open or connected to GND. 14 HALF/FULL Logic input Step mode selector. HIGH logic level sets HALF STEP mode, LOW logic level sets FULL STEP mode. If not used, it has to be connected to GND or +5 V. 15 CONTROL Logic input Decay mode selector. HIGH logic level sets SLOW DECAY mode. LOW logic level sets FAST DECAY mode. If not used, it has to be connected to GND or +5 V. 16 EN Logic input (1) Chip enable. LOW logic level switches OFF all power MOSFETs of both bridge A and bridge B. This pin is also connected to the collector of the overcurrent and thermal protection to implement over current protection. If not used, it has to be connected to +5 V through a resistor. 17 VBOOT Supply voltage Bootstrap voltage needed for driving the upper power MOSFETs of both bridge A and bridge B. 19 OUT2B Power output Bridge B output 2. 20 VSB Power supply Bridge B power supply voltage. It must be connected to the supply voltage together with pin VSA 22 VSA Power supply Bridge A power supply voltage. It must be connected to the supply voltage together with pin VSB 23 OUT2A Power output Bridge A output 2. 24 VCP Output Charge pump oscillator output. 25 RESET Logic input Reset pin. LOW logic level restores the home state (state 1) on the phase sequence generator state machine. If not used, it has to be connected to +5 V. 26 VREFA Analog Input Bridge A current controller reference voltage. Do not leave this pin open or connected to GND. 27 CLOCK Logic input Step clock input. The state machine makes one step on each rising edge. 28 CW/CCW Logic input Selects the direction of the rotation. HIGH logic level sets clockwise direction, whereas LOW logic level sets counterclockwise direction. If not used, it has to be connected to GND or +5 V. 29 SENSEA Power supply Bridge A source pin. This pin must be connected to power ground through a sensing power resistor. 30 RCA RC pin RC network pin. A parallel RC network connected between this pin and ground sets the current controller OFF-time of the bridge A. 31 OUT1A Power output Bridge A output 1. 1. Also connected at the output drain of the over current and thermal protection MOSFET. Therefore, it has to be driven putting in series a resistor with a value in the range of 2.2 k Ω - 180 kΩ, recommended 100 kΩ |
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