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HT16565 Datasheet(PDF) 6 Page - Holtek Semiconductor Inc |
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HT16565 Datasheet(HTML) 6 Page - Holtek Semiconductor Inc |
6 / 9 page HT16565 Rev. 1.00 6 February 7, 2007 Three illumination level set pins, DIM, CONT1 and CONT2 are provided to give control over the display brightness level, as shown in the following table. Switch Pin Name Operating mode DIM CONT1 CONT2 0 (or Open) * * 100% duty display 1 0 (or Open) 1 (or Open) 25% (1/4) duty display at 4096Hz 1 0 (or Open) 0 12.5% (1/8) duty display at 4096Hz 11 1 (or Open) 6.25% (1/16) duty display at 4096Hz Note: ²1² high level, ²0² low level, ²*² don¢t care Device Functions · Reset Although the device is provided with an external reset pin A/C, the device will in fact reset itself when power is applied, eliminating the need for external reset com- ponents. The usual provision of an external capacitor is not required as an internal reset capacitor is inte- grated within the device. · Chatter removal The device contains circuits which are connected to input pins HS, MS and ZA to remove chatter of less than 31.25ms. · Oscillator The basic time base frequency for this device is deter- mined by an external 4.194304MHz crystal. When an external crystal along with two small external capaci- tors are connected to the two oscillator pins, the inter- nal oscillator circuit will ensure generation of the correct time base signals. The oscillation frequency, although determined by the external crystal fre- quency, will also be influenced by the external capaci- tors, the crystal inherent capacitance and the residual capacitance of the external PCB tracks. To ensure ac- curate frequency generation, the crystal specification should be taken into account and care taken to place the external capacitors and crystal as close to the de- vice as possible. Time Adjustment Operation · Hour/minute adjustment Both the minutes and hour displays can be adjusted separately or both together in a fast forward format. The hour set pin, HS, and the minutes set pin, MS, are used to make these adjustments. Both of these pins are connected to internal pull-low resistors. Each time one of these lines is pulled high, the respective hour or minute value will increment by one, also if the line is continuously held high then the respective value will increment automatically at a rate of 2Hz. Both values will increment together if both lines are pulled high si- multaneously. Note that no carry functions will be im- plemented when either the hour or minute value overflows. · Zero adjustment A zero adjust function is also included within the de- vice and is controlled by the ZA pin. This pin is con- nected to an internal pull low resistor. Pulling this line high will reset both the internal minutes and seconds value, however the way in which the display is reset depends upon the present value of display. If the min- ute value is presently less than 30 the only the second and minute values will be reset to zero and the hour value remain unchanged. However if the minute value is presently at a value of 30 or higher then when the zero adjustment function is executed, a carry will be implemented and the hour value will be increment by one. The following table illustrates a few examples of this operation. Zero Adjust Examples Present Time After Zero Adjust Hr. Min. Sec. Hr. Min. Sec. 1 30 00 2 00 00 2 00 00 2 00 00 2 29 59 2 00 00 2 30 00 3 00 00 2 59 59 3 00 00 3 29 59 3 00 00 |
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