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HT6240-002 Datasheet(PDF) 7 Page - Holtek Semiconductor Inc |
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HT6240-002 Datasheet(HTML) 7 Page - Holtek Semiconductor Inc |
7 / 14 page HT6240-002 7 December 16, 1999 Clock oscillating circuit HT6240 has built-in feedback resistor and CMOS inverter, so a ceramic resonator can con- nect between the oscillator circuit input pin (OSCI) and the output pin (OSCO), (see Fig. 3). When the ceramic resonator is set to 455kHz, the carrier can be set 38kHz. The oscillating circuit will stop when there is no key pressed to save power dissipation. Transmission code When the resonator is 455kHz, the carrier of the transmission signal is 38kHz. One pulse width is 0.53ms. Therefore, twenty 38kHz clocks are included in the 0.53ms pulse width. (Fig.4 shows the carrier) HT6240-002 has two different formats. When the custom code is equal to zero, CT will send the 1st format. Otherwise, it will send the 2nd format. If the custom code (C0~C7) is ²0000 0000² then Fig. 5 shows the formation of the transmission code. Fig. 6 shows the transmission code ²0² and ²1² and pulse width. Fig. 7 shows the for- mation of the 1-word transmission code. If a le- gal key is pressed, HT6240-002 will send at least five words (see Fig. 8). N o t e : T h e se c apac i t o r s d e pend on t he r e sonat or s. U se t h e v a l ues r ec om m ende d by t h e r e sonat or m anuf ac t u r e r . O S CI O S CO C LI C LO H T 6240- 002 Fig. 3 8. 8m s 26. 4m s 0. 53 m s Fig. 4 Carrier 0. 53 m s 2. 11 m s 0. 53 m s 4. 22 m s B i t " 0 " B i t " 1 " Fig. 6 Transmission code ²0² and ²1² and pulse width of HT6240-002 D0 D1 D2 D3 D4 D5 D a t a c ode Fig. 5 Formation of the transmission code |
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