誠如大家所知，在全球疫情升溫的影響下，遠端視訊與智慧監控的商機需求與日俱增，在產品應用功能上，除了Focus / Zoom / IR cut / IRIS 之外，對於鏡頭的廣域追蹤與增強觀眾互動感，是產品所矚目的另一個焦點。
有鑒於此，為了能在基礎的平台架構下，與驅動電機快速的接軌，東芝提供了以下的解決方案，讓驅動鏡頭的水平與上下轉動角度，更佳容易操作與使用。
TC78H670FTG 的主要特色包括:
• Built-in Dual H Bridges, Capable of controlling 1 bipolar stepping motor
• PWM controlled constant-current drive
• Power supply operating voltage: 2.5 V to 16.0 V
• Output current ratings: 2.0 A (max)
• Low on-resistance (High + Low side = 0.48 Ω (typ.)) MOSFET output stage
• Allows full, half, quarter, 1/8, 1/16, 1/32, 1/64, 1/128 step operation
• Built-in Sense resistor less current control architecture (Advanced Current Detection System)
• Multi error detect functions (Thermal shutdown (TSD), Over current (ISD), motor load open (OPD)
and Under voltage lockout(UVLO))
• Error detection (TSD/ISD/OPD) flag output function
• Built-in VCC regulator for internal circuit
• Chopping frequency of a motor can be adjusted by external resistor
• Small QFN package with thermal pad (16pin)
Pin Description:
Operating Range (Ta = -40 to 85°C)
The peak output current (Setting current value) can be set via the reference voltage (Vref), as follows:
Iout (Max) = 1.1 × Vref (V)
實作 128 微步驅動步進電機，驅動電流與波型請參考:
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