UPD168111AMA-6A5 Ver la hoja de datos (PDF) - NEC => Renesas Technology

Número de pieza

componentes Descripción

Fabricante

UPD168111AMA-6A5

MICROSTEP DRIVER FOR DRIVING CAMERA LENS

NEC => Renesas Technology 

µ PD168111A

FUNCTION DESCRIPTION

2-phase excitation driving mode

By allowing a current of ±100% to flow into output ch1 and ch2 at the same time, a motor can be driven with the

larger torque. The motor can also be driven on a constant current to reduce the power consumption. The two-phase

driving mode and microstep driving mode are selected by a command.

Microstep driving of stepper motor

To position a stepper motor with high accuracy, the µPD168111A has a function to hold constant the current

flowing through the H bridge by a vector value and to stop one cycle in 64 steps. A 16-bit serial interface is used for

controlling, so that the motor can be directly controlled by the CPU while mitigating the load of the CPU. To realize

the microstep driving mode, the driver internally realizes the following functions.

• Detecting the current flowing into each channel as a voltage value by a sense resistor

• Synthesizing the dummy sine wave of the half-wave generated by the internal D/A and PWM oscillation wave for

chopping operation

• The driver stage performs PWM driving based on the result of comparing the detected voltage value and

synthesized waves.

The internal dummy sine wave is of 64 steps per cycle, so that the stepper motor can be driven in 64 steps. The

microstep driving mode and two-phase excitation driving mode are switched by a command.

+

M

A

Concept of microstep driving operation

Serial control

Information necessary for microstep driving is processed by serial data from the CPU. The commands that specify

the following parameters can be set.

• Start point wait and start point excitation wait

• Chopping frequency

• Motor current, motor revolution direction, and output excitation mode

• Acceleration/deceleration circuit parameters

• Pulse cycle, number of pulses, and pulse number multiplication factor

An address is allocated to each command. Each data can be updated by inputting 16-bit data. For the

configuration of the data and details of the commands, refer to SERIAL INTERFACE SPECIFICATIONS.

A command is specified by specifying an address. Only the data that must be updated can be input. The previous

data of the address for which no data is input is retained.

Data Sheet D16536EJ1V0DS

9

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