ML9298 データシートの表示（PDF） - Oki Electric Industry

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ML9298

12-Hour System Clock IC for 1/2 Duty Fluorescent Display Tubes

Oki Electric Industry 

OKI Semiconductor

FEDL9298-01

ML9298

Time Adjustment

Hour/Minute Fast-forwarding Function

Hour and minute can be fast-forwarded separately. The HS (Hours Set) pin fast-forwards the hour digits, and the

MS (Minutes Set) pin fast-forwards the minute digits individually at 2Hz. One push counts one hour or one minute.

When continuously pushed, hour or minute is incremented at 2Hz.

The HS and MS pins are held at a “H” level by a pull-up resistor in the open state, being in the no active state.

These pins are placed in the active state by driving them at a “L” level externally.

The fast-forwarding of the hour and minute digits can be performed simultaneously.

When fast-forwarding the hour digits, the lower counter continues a regular operation, but the carry-over from the

minute to the hour is not performed.

When fast-forwarding the minute digits, carry over to the hour digits is not performed.

Zero Adjustment Function (±30 minute reset to zero)

The ZA (Zero Adjust) pin is held at a “H” level by a pull-up resistor in the open state, being in the no active state.

This pin is placed in the active state by driving it at a “L” level externally so that hours, minutes and seconds can be

adjusted to zeros.

If the minute digits is less than 30 minutes, the minute and second digits are reset to 00’00”.

Also, if the minute digits exceed 30 minutes, the minute and second digits are reset to 00’00”, and the hour digits

are carried over.

Moreover, the counter below seconds is reset up to 8 Hz.

<Examples of Zero Adjustments>

(X−1) hours 30 minutes 00 seconds

X hours 00 minutes 00 seconds

(X) hours 29 minutes 59 seconds

(X) hours 30 minutes 00 seconds

X hours 59 minutes 59 seconds

(X+1) hours 29 minutes 59 seconds

→ X hours 00 minutes 00 seconds

→ (X+1) hours 00 minutes 00 seconds

Blanking of Display

Blanking occurs in display by driving the BLANK pin at a “L” level externally.

Inputs from HS, MS, and ZA pins are disabled during blanking.

F64Hz Pin

This is the output pin for oscillation frequency adjustment, and constantly outputs a 64Hz signal.

External Reset

This device can be reset by placing the A/C pin at a “H” level.

After reset, the display starts at “1: 00”.

Built-in Regulator Circuit

The built-in regulator circuit reduces the power supply voltage (VCC) for the high voltage to the power supply

voltage for logic , which is output to the VDDOUT pin.

Power is supplied to logic circuitry by connecting the VDDOUT pin to the VDDIN pin.

Power-on Reset

The power-on reset circuit built in this device eliminates the need for providing an external reset circuit.

* Do the followings to operate the power-on reset circuit properly:

- Make a slope of a rise time of VCC to a voltage equal to or larger than 8V/ms.

- Connect a smoothing capacitor of 1000 pF±20% or more between the VDDOUT pin and GND.

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