HT6240-001/HT6240-002 HT6240-001 HT6240-002 HT6240 - Datasheet Archive

 

Infrared Remote Encoder Features · · · Few external parts · · · Operating voltage:

 

HT6240-001/HT6240-002 HT6240-001/HT6240-002 Infrared Remote Encoder Features · · · Few external parts · · · Operating voltage: 2.2V~3.6V Low power consumption Car door controllers Security systems Other remote control systems Applications · · Television and video cassette recorder controllers Garage door controllers General Description instructions. HT6240-001 HT6240-001 and HT6240-002 HT6240-002 have three different packages: 20-pin DIP, 20-pin SOP and 24-pin SOP. HT6240-001 HT6240-001 and HT6240-002 HT6240-002 are designed as infrared remote encoders, usually applied to TV systems. The 4×8 key matrix input and the extension bit input can transmit a max. of 256 Pin Assignment 1 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Block Diagram Pad Assignment Chip size: 92 × 118 mil2 * The IC substrate should be connected to VDD in the PCB layout artwork. 2 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Pad Coordinates Unit: mil Pad No. X Y Pad No. X Y 1 ­40.88 16.11 11 40.12 ­48.32 2 ­40.88 9.48 12 40.12 ­39.74 3 ­40.88 ­11.56 13 40.12 ­24.57 4 ­40.88 ­24.78 14 40.12 ­15.98 5 ­40.88 ­34.04 15 40.12 ­0.81 6 ­40.88 ­41.18 16 40.12 7.78 7 ­13.77 ­52.78 17 34.47 53.59 8 ­7.14 ­52.78 18 ­8.97 53.59 9 9.22 ­53.55 19 ­15.60 53.59 10 24.40 ­53.55 20 ­22.23 52.02 Pad Description HT6240-001 HT6240-001 and HT6240-002 HT6240-002 (20-pin DIP/SOP) Pad No. Pad Name I/O Internal Connection Description 1 PRB I CMOS Pull-high Power on reset 2 OSCI I CMOS Oscillator input 3 OSCO O CMOS Oscillator output 4 DATA I/O CMOS, NMOS, Pull-high 5~8 IE0~IE3 I CMOS Pull-high 9~16 OF7~OF0 O NMOS Drive for key scan 17 CT O CMOS Generates output transmission code 18 VDD I - Positive power supply 19 VSS I - Negative power supply 20 TEST I CMOS Detect custom code and extended code Detect input from key matrix TEST=Low normal mode TEST=High test mode 3 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Approximate internal connection circuits Absolute Maximum Ratings* Supply Voltage . ­0.3V to 5.2V Input Voltage. VSS­0.3 to VDD+0.3 Output Voltage. VSS to VDD Storage Temperature. ­40°C to 125°C Operating Temperature. ­20°C to 70°C *Note: These are stress ratings only. Stresses exceeding the range specified under "Absolute Maximum Ratings" may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. 4 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Ta=­20°C~70°C, unless otherwise noted Recommended Operating Condition Symbol Parameter Test Conditions Min. Typ. Max. Unit - 2.2 - 3.6 V - 2.4V 3V 3V VDD VIL fOSC - High-level Input Voltage IE0~IE3, DATA 3V 3V - 2.1V 3V 3V Low-level Input Voltage IE0~IE3, DATA 3V - 0 0 1.2V Low-level Input Voltage PRB VIH Supply Voltage High-level Voltage PRB VDD Conditions 3V - 0 0 0.9V Clock Oscillating Frequency 3V - - 455 - Electric Characteristics Symbol Parameter V V kHz Ta=25°C, VDD=3V, VSS=0V, unless otherwise noted Test Conditions VDD Limits Unit Conditions Min. Typ. Max. fOSC=455kHz, Ta=­20°C~70°C 2.2 - 3.6 V fOSC=455kHz - 0.1 0.3 mA - - 1 µA mA VDD Supply Voltage IDD Supply Current (during operation) 3V IDD Supply Current (while not in operation) 3V IOH High-level Output Current CT 3V VOH=2V ­5 ­10 - Low-level Output Current CT 3V VOL=0.9V 0.3 0.8 - Low-level Output Current DATA 3V VOL=0.9V 1 4 - Low-level Output Current OF0~OF7 3V VOL=0.9V 1 4 - Pull-up Resistance PRB 3V - - 80 - Pull-up Resistance DATA 3V - - 70 - Pull-up Resistance E0~E3 3V - - 70 - IOL RI 5 - mA k 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Functional Description Key operation Custom code The input pins (IE0~IE3) and the output pins (OF0~OF7) constitute a max. of 4×8 key matrix which is also called standard key. The extended key is formed by input pin DATA and the scan output (OF5~OF7). The 4×8 key matrix and the extended key can transmit a max. of 256 instruction. The custom code is made up of input pin DATA and scan output OF0~OF4. It has 8 bits (C0~C7); the lower 3 bits of the custom code (C5, C6 and C7) are fixed as "0". Fig. 1 shows an example of custom code selection. CT maintains "L" and no transmission code is generated when two or more keys in standard key are pressed. Table 1 shows the relationship between the key matrix and the transmission code. Table 1 Transmission Code Key Input D1 D0 IE0 0 0 IE1 0 1 IE2 1 0 IE3 1 1 Fig. 1 Extended bit Transmission Code Scan Output D4 D3 D2 OF0 0 0 0 OF1 0 0 1 OF2 0 1 0 OF3 0 1 1 OF4 1 0 0 OF5 1 0 1 OF6 1 1 0 OF7 1 1 1 Transmission Code DATA Input D7 D6 D5 OF5 - - 1 OF6 - 1 - OF7 1 - The extended bit is formed by input pin DATA and the scan output (OF5~OF7). Fig. 2 shows an example of extended bit selection. - Fig. 2 6 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Clock oscillating circuit HT6240-001 HT6240-001 HT6240 HT6240 has built-in feedback resistor and CMOS inverter, so a ceramic resonator can connect between the oscillator circuit input pin (OSCI) and the output pin (OSCO), (see Fig. 3). HT6240-001 HT6240-001 is similar to HT6240-002 HT6240-002 except for the transmission code format. HT6240-001 HT6240-001 has only one transmission code format (see Fig. 5 ) which shows the formation of the transmission code. The transmission code consists of the head pulse, 8-bit custom code and 8-bit data code. Fig. 6 shows bit "0" and bit "1" of HT6240-001 HT6240-001. Fig. 7 shows the formation of the 1-word transmission code without carrier in detail (In fact, output CT should combine with the carrier when CT is high). 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. CT will send at least one word if a legal key is pressed. It may send one, two or several words depending on the length of time the legal key is pressed (see Fig. 8). Fig. 3 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) Fig. 6 Bit "0" and Bit "1" of HT6240-001 HT6240-001 Fig. 4 Carrier Fig. 5 The transmission code of HT6240-001 HT6240-001 7 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Fig. 7 The formation of the 1-word transmission code without carrier Fig. 8 Fig. 9 Formation of the transmission code Fig. 10 Transmission code "0" and "1" and pulse width of HT6240-002 HT6240-002 Fig. 11 The formation of the 1-word transmission code Fig. 12 A legal key will send at least five words 8 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Fig. 13 The formation of the transmission code when custom code "0000 0000" Fig. 15 If custom code "0000 0000" then Fig. 13 shows the formation of the transmission code. The transmission code consists of a head pulse, 8-bit custom code and 8-bit data code. Fig. 14 shows bit "0" and bit "1". HT6240-002 HT6240-002 HT6240-002 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 "0000 0000" then Fig. 9 shows the formation of the transmission code. Fig. 10 shows the transmission code "0" and "1" and pulse width. Fig. 11 shows the formation of the 1-word transmission code. If a legal key is pressed, HT6240-002 HT6240-002 will send at least five words (see Fig. 12). On table 2, the relationship between the key matrix and the transmission code is shown when custom code="0000 0000". The asterisks means that HT6240-002 HT6240-002 can just send five words at a time even if a legal key is pressed for a long time. The others mean that HT6240-002 HT6240-002 will send five or six words, even some more words if a legal key is still pressed. Fig. 14 The formation of a 1-word transmission code without carrier is shown in detail in Fig.15. Output CT should combine with the carrier when CT is high. Table 2 CT will send at least three words if we press a legal key. CT may send three or four words, or several words depending on the length of time the legal key is pressed. (see Fig. 16) OF0 OF1 OF2 OF3 OF4 OF5 OF6 OF7 IE0 00 04 08 IE1 01 05 09* 0D* 11* 15* 19* 1D* IE2 02 06 0A* 0E* 12* 16* 1A* 1E* IE3 03 07 0B* 0F* 13* 17* 1B* 1F* 0C 10* 14* 18* 1C* There are 64 instructions when the custom code="0000 0000" in HT6240-002 HT6240-002. The transmission output CT is still "L" and the transmission code will not be sent when two or more keys are pressed simultaneously. Fig. 16 9 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Power on reset function (PRB) The power on reset function can be activated by connecting a capacitor to PRB pin while power is applied. The time (TC) must be longer than 0.1ms when the voltage in PRB pin (VC) becomes higher than 0.3VDD after the voltage in VDD pin exceeds 2.2V. When the power on reset function is activated, the standby state continues until an "L" is input to IE0~IE3. Fig. 18 Relationship between the PRB pin and the voltage Fig. 17 Example of power-on reset function 10 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Application Circuits Example (1) 11 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Example (2) 12 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Example (3) 13 18th June '98 HT6240-001/HT6240-002 HT6240-001/HT6240-002 Example (4) 14 18th June '98