A3992 Allegro MicroSystems, Inc., A3992 Datasheet
A3992
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A3992 Summary of contents
Page 1
... Special power up sequencing is not required. The A3992 is supplied in a thin profile (1.2 mm maximum height) 24 pin TSSOP (suffix LP) with exposed thermal pad and a 24 pin plastic DIP with dual copper batwing tabs (suffix B). The exposed thermal pad on the ground potential and needs no electrical isolation ...
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... A3992 Selection Guide Part Number A3992SB-T A3992SLP-T A3992SLPTR-T Tape, 4000 pieces/reel *Contact Allegro for additional packing options Absolute Maximum Ratings Characteristic Load Supply Voltage Output Current Logic Supply Voltage Logic Input Voltage Range VBBx to OUTx Voltage OUTx to SENSEx Voltage REF Reference Voltage ...
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... A3992 VDD UVLO and Fault Detect MUX Bit Linear DAC Internal Oscillator OSC OSC Select/ Divider CLOCK DATA Serial Port STROBE SLEEP REF 6 Bit REF Buffer Linear DAC Microstepping PWM Motor Driver Functional Block Diagram 0.22 µF CP2 ...
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... A3992 ELECTRICAL CHARACTERISTICS 1 valid at T Characteristic Output Drivers Load Supply Voltage Range Output Leakage Current Output On Resistance Body Diode Forward Voltage Motor Supply Current Logic Supply Current Control Logic Logic Supply Voltage Range Logic Input Voltage Logic Input Current Input Hysteresis ...
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... A3992 The A3992 is controlled via a 3 wire serial port. The programmable functions allow maximum fl exibility in confi guring the PWM to the motor drive requirements. The serial data is written as two 19 bit words, 1 bit to select which word (referred to here as Word 0 and Word 1) and 18 bits of data. The serial port is defi ned in the following tables and text descriptions ...
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... A3992 Word 1 Bit Assignments Word 1 is selected by setting Assignments are summarized in the following table, and desribed in detail in the remainder of this section. Word 1 Bit Assignments Bit Function D0 Word Select = 1 D1 Blank Time LSB D2 Blank Time MSB D3 Off Time LSB D4 Off Time Bit1 ...
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... If the fast decay time is set longer than the off- time, the device effectively operates in fast decay mode. Oscillator. input, typically 4 MHz. The A3992 can be confi gured to select either the 4 MHz internal oscillator or, if more precise accuracy is required, an external clock can be connected to the OSC terminal ...
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... A3992 Charge Pump (CP1 and CP2). used to generate a gate supply greater than V drive the source FET gates. A 0.22 μF ceramic capaci- tor is required between CP1 and CP2 for pumping purposes. A 0.22 μF ceramic capacitor is required between VCP and the VBB terminals to act as a reser- voir to operate the high-side FETs ...
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... The A3992 synchronous rectifi cation feature turns on the appropriate MOSFETs during current decay, and effec- tively shorts out the body diodes with the low R driver. This lowers power dissipation signifi ...
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... By making the connection be- tween the pad and the ground plane directly under the A3992, that area becomes an ideal location for a star ground point. A low impedance ground will prevent ground bounce during high current operation and en- sure that the supply voltage remains stable at the input terminal ...
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... A3992 B Package VCP 1 CP1 2 CP2 3 OUT1B 4 VBB1 5 GND 6 GND 7 SENSE1 8 OUT1A 9 STROBE 10 CLOCK 11 DATA 12 Terminal List Table Number B Package Package 18 – – Microstepping PWM Motor Driver Device Pin-out Diagrams ...
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... A3992 Package B, 24 Pin DIP with Fused Pins Package B, 24 Pin DIP with Fused Pins .005 0.13 MIN .070 1.78 .045 1.14 Preliminary dimensions, for reference only Dimensions in inches Metric dimensions (mm) in brackets, for reference only (reference JEDEC MS-001 AF) Dimensions exclusive of mold flash, gate burrs, and dambar protrusions ...
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... A3992 Package LP, 24 Pin TSSOP with Exposed Thermal Pad Package LP, 24 Pin TSSOP with Exposed Thermal Pad Preliminary dimensions, for reference only Dimensions in millimeters U.S. Customary dimensions (in.) in brackets, for reference only (reference JEDEC MO-153 ADT) Dimensions exclusive of mold flash, gate burrs, and dambar protrusions ...