STV3012 REMOTE CONTROL TRANSMITTER FOR AUDIO AND VIDEO APPLICATIONS .. . . . .. . .. . PRELIMINARY DATA TWO TIMING AND DATA FORMAT MODES 7 SUB-SYSTEM ADDRESSES UP TO 64 COMMANDS PER SUB-SYSTEM ADDRESS KEY RELEASE DETECTION BY TOGGLE BIT (1 toggle bit in mode A and 2 toggle bits in mode B) HIGH CURRENT REMOTE OUTPUT AT VDD = 3V (-IOH = 80mA) VERY LOW STAND-BY CURRENT (< 2µA) 1mA OPERATIONAL CURRENT AT 6V SUPPLY CERAMIC RESONATOR CONTROLLED FREQUENCY (typ. 450kHz) MODULATED TRANSMISSION SUPPLY VOLTAGE RANGE 2V TO 6.5V LOW NUMBER OF EXTERNAL COMPONENTS DIP20 (Plastic Package) ORDER CODE : STV3012 REMO 1 20 VDD SEN6N 2 19 DRV6N SEN5N 3 18 DRV5N SEN4N 4 17 DRV4N SEN3N 5 16 DRV3N SEN2N 6 15 DRV2N DESCRIPTION SEN1N 7 14 DRV1N The STV3012 is a general purpose infrared remote control transmitter system for low voltage supply applications. It is able to generate a total number of 448 commands which are divided into 7 sub-system groups with 64 commands each. The sub-system code may be selected by a press button, a slider switch or hard wired. Two different timing and data format modes are available. SEN0N 8 13 DRV0N ADRM 9 12 OSCO 10 11 OSCI V SS March 1993 This is advance information on a new product now in development or undergoing evaluation. Details are subject to change without notice. 3012-01.EPS PIN CONNECTIONS 1/8 STV3012 BLOCK DIAGRAM OSCILLATOR DIVIDER OSCI 11 3 SEN4N 4 SEN3N 5 SEN2N 6 SEN1N 7 SEN0N 8 REMO 1 SYST. CONTR 9 18 DRV5N 17 DRV4N 16 DRV3N 15 DRV2N 14 DRV1N PARALLEL /SERIAL CONVERTER REMOTE ADRM 19 DRV6N KEYBOARD DRIVER DECODER SEN5N 10 VSS ADDRESS LATCHES 2 KEYBOARD ENCODER SEN6N 20 VDD MASTER CLEAR 13 DRV0N 3012-02.EPS OSCO 12 ABSOLUTE MAXIMUM RATINGS ±I - I(REMO) Ptot Tstg Toper Parameter Supply Voltage Input Voltage Output Voltage D.C. Current into any input or output Value - 0.3, 7.0 - 0.3, VDD + 0.3 - 0.3, VDD + 0.3 10 Peak REMO Output Current during 10µs, duty factor = 1% Power Dissipation per package for Tamb = - 20 to + 70oC Storage Temperature Operating Ambient Temperature Unit V V V mA 300 mA 200 - 55, + 125 -20, + 70 mW o C o C 3012-01.TBL Symbol VDD VI VO ELECTRICAL CHARACTERISTICS VSS = 0V, TA = 25oC (unless otherwise specified) Symbol VDD IDD Parameter Supply Voltage Supply Current Test Conditions TA = 0 to + 70oC • Active fOSC = 455kHz VDD = 3V REMO Output unload VDD = 6V • Inactive (stand-by mode) VDD = 6V Min. 2 fOSC Oscill. Frequency VDD = 2 to 6.5V (ceramic resonator) 350 Typ. 0.25 1.0 Max. 6.5 0.5 2 2 600 Unit V mA mA 0.3 x VDD V V 100 600 µA µA µA µA kHz KEYBOARD MATRIX - Inputs SEN0N to SEN6N VIL VIH - II II Input Voltage Low Input Voltage High Input Current VDD = VDD = VDD = VDD = 2 to 6.5V 2 to 6.5V 2V, VI = 0V 6.5V, VI = 0V Input Leakage Current VDD = 6.5V, VI = VDD 0.7 x VDD 10 100 1 2/8 VOL Output Voltage "ON" IO Output Current "OFF" VDD = 2V, IO = 0.1mA VDD = 6.5V, IO = 1.0mA VDD = 6.5V, VO = 6.5V 0.3 0.6 10 V V µA 3012-02.TBL KEYBOARD MATRIX - Outputs DRV0N to DRV6N STV3012 ELECTRICAL CHARACTERISTICS Tamb = 25oC, unless otherwise specified Symbol Parameter Test Conditions Min. Typ. Max. Unit 0.3 x VDD V V -10 -100 -100 -600 µA µA 10 100 100 600 µA µA 1 mA mA mA mA mA msec CONTROL INPUT ADRM VIL VIH IIL IIH Input Voltage Low Input Voltage High Input Current Low Pull-up Act. Oper. Condition, VIN = VSS VDD = 2V (switched P and N VDD = 6.5V channel pull-up/pull down) Input Current High Pull-down Act. Stand-by Cond.,VIN = VDD VDD = 2V (switched P and N VDD = 6.5V channel pull-up/pull down) 0.7 x VDD DATA OUTPUT REMO - IOH Output Current High IOL Output Current Low tOH Pulse Length VDD = 2.5V, VOH = 0.8V, TA = 70oC VDD = 2.5V, VOH = 0.8V, TA = 25oC VDD = 6.5V, VOH = 5V VDD = 2V, VOL = 0.4V VDD = 6.5V, VOL = 0.4V VDD = 6.5V, Oscill. Stopped 70 80 80 0.6 0.6 II VOH VOL Input Current Output Voltage high Output Voltage Low OSCI at VDD VDD = 2V VDD = 6.5V 5 VDD = 6.5V, - IOH = 0.1mA VDD = 6.5V, IOL = 0.1mA I - INPUTS AND OUTPUTS I.1 - Key Matrix Inputs and Outputs (DRV0N to DRV6N and SEN0N to SEN6N) The transmitter keyboard is arranged as a scanned matrix. The matrix consists of 7 driver ouputs and 7 sense inputs. The driver outputs DRV0N to DRV6N are open drain N-channel transistors and they are conductive in the stand-by mode. The 7 sense inputs (SEN0N to SEN6N) enable the generation of 56 command codes. With 2 external diodes all 64 commands are addressable. The sense inputs have P-channel pull-up transistors so that they are HIGH until they are pulled LOW by connecting them to an output via a key depression to initiate a code transmission. The codes for the selected key are given in Table 1. I.2 - Address Mode Input (ADRM) The sub-system address and the transmission mode are defined by connecting the ADRM input to one or more driver outputs (DRV0N to DRV6N) of the key matrix. If more than one driver is connected to ADRM, they must be decoupled by diodes. This allows the definition of seven sub-system addresses as shown in Table 2. The ADRM input has switched pull-up and pulldown loads. In the stand-by mode only the pull- 5 7 VDD - 0.8 0.7 µA µA V V down device is active. Whether ADRM is open (sub-system address 0) or connected to the driver outputs, this input is LOW and will not cause unwanted dissipation. When the transmitter becomes active by pressing a key, the pull-down device is switched-off and the Pull-up device is switched-on, so that the applied driver signals are sensed for the decoding of the sub-system address and the mode of transmission. The arrangement of the sub-system address coding is such that only the driver DRVnN with the highest number (n) defines the sub-system address, e.g. in mode B, if drivers DRV2N and DRV4N are connected to ADRM, only DRV4N will define the sub-system address. This option can be used in systems requiring more than one sub-system address. The transmitter may be hard-wire for subsystem address 2 by connecting DRV1N to ADRM. If now DRV3N is added to ADRM by a key or a switch, the transmitted sub-system address changes to 4. A change of the sub-system will not start a transmission. I.3 - Remote Control Signal Output (REMO) The REMO signal output stage is a push-pull type. In the HIGH state, a bipolar emitter-follower allows a high output current. The timing of the data output format is listed in Figures 1 and 2. 3/8 3012-03.TBL OSCILLATOR STV3012 The toggle bits function as an indication for the decoder that the next instruction has to be considered as a new command. The information is defined by the first edge of the modulated pulses. During mode A, the data word starts with the four bits for defining the sub-system address S3, S2, S1 and S0, followed by the toggle bit T0, and seven bits G, F, E, D, C, B and A, which are defined by the selected key. During mode B, the data word starts with the Toggle bits T1 and T0, followed by three bits for defining the sub-system address S2, S1 and S0, and six bits F, E, D, C, B and A which are defined by the selected key. The REMO output is protected against "lock-up", i.e. the length of an output pulse is limited to < 1msec, even if the oscillator stops during an output pulse. This avoids the rapid discharge of the battery that would otherwise be caused by the continuous activation of the LED. Table 1 : Key Codes DRV0N DRV1N DRV2N DRV3N DRV4N DRV5N DRV6N VSS DRV0N DRV0N DRV0N DRV0N DRV0N DRV0N DRV0N to VSS to VSS to VSS to VSS to VSS to VSS to VSS Matrix Sense SEN0N SEN0N SEN0N SEN0N SEN0N SEN0N SEN0N SEN0N SEN1N SEN2N SEN3N SEN4N SEN5N SEN6N SEN5N and SEN6N G** 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 F 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 E 0 0 0 0 0 0 0 0 0 1 1 0 0 1 1 Code D 0 0 0 0 0 0 0 0 1 0 1 0 1 0 1 C 0 0 0 0 1 1 1 1 B 0 0 1 1 0 0 1 1 * * * * * * * Matrix Position A 0 1 0 1 0 1 0 1 0 1 2 3 4 5 6 7 8 to 15 16 to 23 24 to 31 32 to 39 40 to 47 48 to 55 56 to 63 3012-05.TBL Matrix Drive * The C, B and A codes are identical to SEN0N as given above. ** Bit position G only available in mode A. Table 2 : Transmission Mode and Sub-system Address Selection M O D E A M O D E B # 0 1 2 3 4 5 6 0 1 2 3 4 5 6 Sub-system Address S3 S2 S1 0 0 0 0 0 1 0 1 1 0 0 0 0 1 0 0 0 1 0 1 1 1 1 0 0 0 0 0 1 0 1 1 0 1 0 S0 0 0 0 1 1 1 1 1 0 1 0 1 0 1 0 1 X X X X X O X X X X O O X X X X X O X X X X Driver DRVnN for n = 2 3 4 X X X O O X X X X X O O X X X O O X 5 6 O O O O O O O O O O = connected to ADRM blank = not connected to ADRM X = don’t care The sub-system address and the transmission mode are defined by connecting the ADRM input to one or more driver outputs (DRV0N to DRV6N) of the key matrix. If more than one driver is connected to ADRM, they must be decoupled by diodes. 4/8 3012-04.TBL Mode STV3012 Figure 1 : Data Format of REMO ; T0 and T1 = toggle bits ; S0, S1, S2 and S3 = sub-system address ; A, B, C, D, E, F and G = command bits MODE A tw H REMO L bit S3 S2 S1 S0 T0 G F E D C B A data 0 1 0 1 0 1 0 0 1 0 0 1 MODE B S3 tw H L bit T0 T1 S2 S1 S0 F E D C B A data 0 1 0 1 0 1 0 0 1 0 0 Bit Separation (tB) Logic "0" Logic "1" Toggle bit time Mode A 1 x t0 2 x t0 1 x t0 or 2 x t0 3012-03.EPS REMO T0 Mode B 2 x t0 3 x t0 2 x t0 or 3 x t0 Figure 2 : Pulse Train Timing (ref. to fOSC = 400kHz) t B (bit duration) t PW tM t ML 1st bit 2nd bit last bit 3012-04.EPS t MH t W (word distance) Mode A B t0 (ms) 2.52 2.88 tM (µs) 30 30 tMH (µs) 10 10 tML (µs) 20 20 tW (ms) 86.04 138 Mode A and B tOSC tM tML tMH 2.5µs 12 x tOSC 8 x tOSC 4 x tOSC oscillation period modulation period modulation period LOW modulation period HIGH (15 x tM) + tMH 1008 x tOSC 34416 x tOSC modulated pulse basic unit of pulse distance word distance (11 x tM) + tMH 1152 x tOSC 55296 x tOSC modulated pulse basic unit of pulse distance word distance Mode A tPW t0 tW Mode B tPW t0 tW 5/8 STV3012 I.4 - Oscillator Input and Output The external components must be connected to these pins when using an oscillator with a ceramic resonator. The oscillator frequency may vary between 350kHz and 600kHz as defined by the resonator. No external feedback resistor is allowed. II - FUNCTIONAL DESCRIPTION Key operation (see Figure 3) : In the stand-by mode all drivers (DRV0N to DRV6N) are on (low impedance to VSS). Whenever a key is pressed, one or more of the sense inputs (SENnN) are tied to ground. This will start the power-up sequence. First the oscillator is activated and after the debounce time tDB the output drivers (DRV0N to DRV6N) become active successively. Within the first scan cycle, the transmission mode, the applied sub-system address and the selected command code are sensed and loaded into an internal data latch. In contrast to the command code, the sub-system is sensed only within the first scan cycle. If the applied sub-system address is changed while the Command key is pressed, the transmitted sub-system address is not altered. In a multiple key stroke sequence the command code is always altered in accordance with the sensed key. III - OUTPUT SEQUENCE (DATA FORMAT) The output operation will start when the selected Figure 3 : code is found. A burst of pulses, including the latched address and command codes, is generated at the output REMO as long as a key is pressed. The operation is terminated by releasing the key or if more than one key is pressed at the same time. Once a sequence is started, the transmitted data words will always be completed after the key is released. The toggle bits T1 and T0, during mode A only T0, toggle if the key is released for a minimum time tREL. The toggle bits remain unchanged within a multiple key-stroke sequence. IV - MULTIPLE KEY-STROKE PROTECTION The keyboard is protected against multiple keystrokes (Figure 4). If more than one key is pressed at the same time, the circuit will not generate a new output at REMO. In case of a multiple key-stroke, the scan repetition rate is increased to detect the release of a key as soon as possible. There are two restrictions caused by the special structure of the keyboard matrix : the keys switching to ground (code numbers 7, 15, 23, 31, 39, 47, 55 and 63) and the keys connected to SEN5N and SEN6N are not covered completely by the multiple key protection. If one sense input is switched to ground, further keys on the same sense line are ignored, i.e. the command code corresponding to "key to ground" is transmitted. SEN5N and SEN6N are not protected against multiple keystroke on the same driver line, because this condition has been used for the definition of additional codes (code number 56 to 63). Single Key-stroke Sequence. Debounce time : tDB = 4 to 9 x t0, Start time : tST = 5 to 10 x t0, Minimum release time : tREL = t0. key bouncing REV t REL closed released new key scan DRVnN off on t DB scan tW REMO scan new word H L OSCO 6/8 H L OSCILLATOR ACTIVE 3012-05.EPS t ST STV3012 Figure 4 : Multiple Key-stroke Sequence. Scan rate multiple key-stroke : tSM = 8 to 10 x t0. key bouncing key A decoded as HIGH closed KEY A released KEY B key A decoded as LOW closed released scan scan scan off DRVnN on t DB REMO t SM tW t DB t ST H L OSCO word key A word key B word key A H 3012-06.EPS t ST OSCILLATOR ACTIVE L SEN1N SEN2N 14 15 16 17 DRV6N DRV5N DRV4N DRV3N DRV1N DRV0N 13 SEN0N DRV2N TYPICAL APPLICATION 18 19 V DD 20 8 7 REMO 6 1 SEN3N STV3012 5 SEN4N 4 SEN5N 3 ADRM 2 9 11 10 V SS OSCI 12 OSCO 3012-07.EPS SEN6N 7/8 STV3012 I b1 L a1 PACKAGE MECHANICAL DATA 20 PINS - PLASTIC DIP B b Z e E Z e3 D 11 1 10 a1 B b b1 D E e e3 F i L Z Min. 0.254 1.39 Millimeters Typ. Max. 1.65 Min. 0.010 0.055 0.45 0.25 Inches Typ. Max. 0.065 0.018 0.010 25.4 8.5 2.54 22.86 1.000 0.335 0.100 0.900 7.1 3.93 3.3 0.280 0.155 0.130 1.34 0.053 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics. © 1994 SGS-THOMSON Microelectronics - All Rights Reserved Purchase of I2C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips I2C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to the I2C Standard Specifications as defined by Philips. SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A. 8/8 DIP20.TBL Dimensions PM-DIP20.EPS F 20