The µPD16878 is a monolithic quad H bridge driver IC that employs a CMOS control circuit and a MOS FET output circuit. Because it uses MOS FETs in its output stage, this driver IC consumes less power than conventional driver ICs that use bipolar transistors. Because the µPD16878 controls a motor by inputting serial data, its package has been shrunk and the number of pins reduced. As a result, the performance of the application set can be improved and the size of the set has been reduced. The µPD16878 employs a current-controlled 64-step micro step driving method that drives stepper motor with low vibration. The µPD16878 is housed in a 38-pin plastic shrink SOP to contribute to the miniaturization of the application set. The µPD16878 can simultaneously drive two stepper motors and is ideal for the mechanisms of camcorders.
The uPD16878 is a monolithic quad H‑bridge driver IC that uses a CMOS control circuit and MOS‑FET output stage, offering low power consumption compared with bipolar driver ICs. It drives stepper motors via serial data, supports a 64‑step micro‑stepping method, and is packaged in a 38‑pin plastic shrink SOP for compact applications such as camcorder mechanisms.
The datasheet details the pin functions, electrical characteristics, ordering information, and handling precautions for CMOS devices. It includes characteristic curves for power dissipation, voltage ranges, and current consumption, as well as notes on ESD protection and unused pin handling.
| H‑bridge circuits | Four H‑bridge circuits employing power MOS FETs |
|---|---|
| Micro‑step method | Current‑controlled 64‑step micro step driving |
| Serial motor control | Motor control by serial data (8 bytes x 8 bits) |
| EVR reference voltage | 100 to 250 mV (typ.) |
| Chopping frequency | 32 to 124 kHz |
| Minimum operating voltage | 2.7 V |
| Supply current (Ipp) | 3.0 mA (MAX.) |
| Reset leakage current (Imo RESET) | 1.0 µA (MAX.) |
| Package | 38‑pin plastic shrink SOP (7.62 mm) |
The device operates down to a minimum voltage of 2.7 V.
It can simultaneously drive two stepper motors.
The EVR reference voltage can be set between 100 mV and 250 mV.
The chopping frequency is selectable from 32 kHz to 124 kHz.