UPD168113 datasheet(7/50 Pages) NEC

7 / 50 page

Data Sheet S16423EJ2V0DS

µ PD168113

5. FUNCTIONAL DEPLOYMENT

5.1 Serial Control

All information for driving the motor is processed by serial data from the CPU. The following parameters can be set

by commands.

• Control of DC motor driving and output duty

• Control during constant-current driving and current setting

• Wait value for setting timing during stepping motor driving

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

• Pulse cycle, and number of pulses

Each command is assigned an address. Each data can be updated by inputting 16-bit data. For the configuration of

the data and details of commands, refer to 9. SERIAL INTERFACE SPECIFICATIONS.

5.2 Reset Function

An initialization operation is performed and all the internal data is cleared to 0 when RESETB = L. The output

remains in the Hi-Z state.

When RESETB = H, commands can be input.

Once it sets the address 0 to address 2 for an initialization setting, they carry out latch operation inside, and prohibit

overwriting. In order that initialization operation is performed again, the reset operation is needed.

Be sure to perform a reset operation after turning on power supply. When RESETB = L, the internal circuitry is

stopped whenever possible, so that the self current consumption can be reduced. When input of the external CLK is

stopped, the current consumption can be lowered to 1

µA MAX.

Immediately after release of reset, excitation is started from the position where the current of ch1 is 100% and the

current of ch2 is 0%, in the micro step drive mode and 1-2 phase excitation drive mode. In the 2-phase excitation

drive mode, excitation is started from the position where the currents of ch1 and ch2 are 100%.

Remark L: Low level, H: High level, Hi-Z: High impedance

5.3 Current Detection Resistor Connection (FB) Pin

The current detection resistor is connected when current driving is necessary.

For example: When micro step driving, when solenoid driving.

The current that flows into the output is {set voltage value/FB pin resistance x 1000}.

Example)

Where the set voltage value is 200 mV, FB = 2 k

Ω

Output current value = 200 (mV) /2 (k

Ω) x 1000

= 100 (mA)

Therefore, the load is driven at a constant current of 100 mA.

The set voltage value is a value that can be set by serial control.

UPD168113 Datasheet(PDF) 7 Page - NEC