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DRV8846RGER Datasheet(PDF) 11 Page - Texas Instruments |
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DRV8846RGER Datasheet(HTML) 11 Page - Texas Instruments |
11 / 35 page xOUT1 xOUT2 VM xISEN Pre- drive VM PWM OCP OCP Optional Step Motor SIN DAC 5 + ± DAC 3 I1 VREF I0 A = 6.6 3- level Input buffer To other channel From Indexer Internal reference To other channel DIR STEP Indexer DRV8846 www.ti.com SLLSEK2 – JUNE 2014 8.3 Feature Description 8.3.1 PWM Motor Drivers DRV8846 contains two identical H-bridge motor drivers with current-control PWM circuitry. Figure 6 shows a block diagram of the circuitry. Figure 6. PWM Motor Driver Circuitry 8.3.2 Micro-Stepping Indexer To allow a simple step and direction interface to control stepper motors, the DRV8846 contains a microstepping indexer. The indexer controls the state of the H-bridges automatically. When the correct transition is applied at the STEP input, the indexer moves to the next step, according to the direction set by the DIR pin. In 1/8, 1/16, and 1/32 step modes, both the rising and falling edges of the STEP input may be used to advance the indexer, depending on the M0 / M1 setting. The nENBL pin disables the output stage in indexer mode. When nENBL = 0, the indexer inputs are still active and respond to the STEP and DIR input pins; only the output stage is disabled. The indexer logic in the DRV8846 allows a number of different stepping configurations. The M0 and M1 pins configure the stepping format (see Table 2). Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: DRV8846 |
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