Data Sheet S14188EJ1V0DS00

19

µµµµPD16879

[2nd byte]

The 2nd byte specifies the delay between the first point wait time being cleared and the output pulse being

generated. This time called the first point magnetize wait time, and the output pulse is generated from the point at

which the start up wait time. The first point magnetize wait time is counted at the falling edge of the first point wait

time. The first point magnetize wait time can be set to 58.03 ms (when a 4.5 MHz clock input) and can be fine-tuned

by means of 8-bit division (227.6

µs step: with 4.5 MHz clock).

Always input data other than “0” to this byte because the first point magnetize wait time is necessary for latching

data. If “0” is input to this byte, data cannot be updated.

Table 4. 2nd Byte Data Configuration

Bit

D7D6D5D4D3D2D1

D0

Data

First point wait

Data

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

00000000

Prohibition

MSB

LSB

00101001

About 9.33 ms

11111111

About 58.03 ms

nN

× 1024/4.5 MHz

[3rd byte]

The 3rd byte sets the chopping frequency and external extension pins (EXP0, EXP1).

The chopping frequency sets by bits D0 to D5.

The EXP pins goes low (current sink) when the input data is “0”, and high (high-impedance state) when the input

data is “1”. Pull this pin up to VDD for use.

Table 5. 3rd Byte Data Configuration

Bit

D7D6D5D4D3D2D1

D0

Data

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

EXP1 sets

MSB

LSB

EXP0 sets

Chopping frequency sets

D7: EXP1 sets

“1”: High impedance

“0”: Low level (Current sink)

D6: EXP0 sets

“1”: High impedance

“0”: Low level (Current sink)

The chopping frequency is set to 0 kHz and to a value in the range of 35.71 kHz to 225 kHz (4.5 MHz clock input).

Refer to table 1 (4 page).

[4th byte]

The 4th byte selects a parameter to be output EXT

α and EXT β pins (logic operation monitor pin). And, power

save mode sets too.

Table 6. 4th Byte Data Configuration

Bit

D7D6D5D4D3D2D1

D0

Data

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

0 or 1

Power save sets

Test parameter select