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SAA3008 Dataheets PDF



Part Number SAA3008
Manufacturers Philips
Logo Philips
Description Infrared remote control transmitter RECS 80 low voltage
Datasheet SAA3008 DatasheetSAA3008 Datasheet (PDF)

INTEGRATED CIRCUITS DATA SHEET SAA3008 Infrared remote control transmitter (RECS 80 low voltage) Preliminary specification File under Integrated Circuits, IC02 December 1988 Philips Semiconductors Preliminary specification Infrared remote control transmitter (RECS 80 low voltage) GENERAL DESCRIPTION SAA3008 The SAA3008 transmitter IC is designed for infrared remote control systems. It has a capacity for 1280 commands arranged in 20 sub-system address groups of 64 commands each. The subsyste.

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INTEGRATED CIRCUITS DATA SHEET SAA3008 Infrared remote control transmitter (RECS 80 low voltage) Preliminary specification File under Integrated Circuits, IC02 December 1988 Philips Semiconductors Preliminary specification Infrared remote control transmitter (RECS 80 low voltage) GENERAL DESCRIPTION SAA3008 The SAA3008 transmitter IC is designed for infrared remote control systems. It has a capacity for 1280 commands arranged in 20 sub-system address groups of 64 commands each. The subsystem address may be selected by press-button, slider switches or be hard-wired. Commands are transmitted in patterns which are pulse distance coded. Modulated pulse transmissions allow a narrow-band receiver to be used for improved noise rejection. The modulation frequency of the SAA3008 is 38 kHz which is 1⁄12 of the oscillator frequency of 455 kHz (typical). Features • Modulated transmission • Ceramic resonator controlled frequency • Data-word-start with reference time of unique start pattern • Supply voltage range 2 V to 6.5 V • 40 mA output current capability • Very low standby current (< 4 µA at VDD = 6 V) • Up to 20 subsystem address groups; up to 1280 commands • Up to 64 commands per subsystem address; up to 1280 commands • Requires few additional components PACKAGE OUTLINES SAA3008P: 20-lead DIL; plastic (SOT146); SOT146-1; 1996 December 6. SAA3008T: 20-lead mini-pack; plastic (SO20; SOT163A); SOT163-1; 1996 December 6. December 1988 2 Philips Semiconductors Preliminary specification Infrared remote control transmitter (RECS 80 low voltage) SAA3008 Fig.1 SAA3008 application example. PINNING 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Fig.2 Pinning diagram. 19 20 December 1988 3 REMO SEN6N SEN5N SEN4N SEN3N SEN2N SEN1N SEN0N ADRM VSS OSCI OSCO DRV0N DRV1N DRV2N DRV3N DRV4N DRV5N DRV6N VDD positive supply voltage drive outputs to key matrix address/mode control input ground (0 V) oscillator input oscillator output sense inputs from key matrix remote data output Philips Semiconductors Preliminary specification Infrared remote control transmitter (RECS 80 low voltage) FUNCTIONAL DESCRIPTION Key matrix (DRV0N -DRV6N and SEN0N-SEN6N) The transmitter keyboard is arranged as a scanned matrix with seven driver outputs (DRV0N to DRV6N) and seven sensing inputs (SEN0N to SEN6N) as shown in Fig.1. The driver outputs are open-drain n-channel transistors which are conductive in the stand-by mode. The sensing inputs enable the generation of 56 command codes. With two external diodes connected (or triple contact), as in Fig.1, all 64 commands are addressable. The sense lines have p-channel pull-up transistors, so that they are HIGH until pulled LOW by connecting them to an output via a key depression to initiate a code transmission. The maximum allowable value of contact series resistance for keyboard switches in the ON-state is 7 kΩ. Address/mode input (ADRM) Subsystem addresses are defined by connecting one or two of the key matrix driver lines (DRV0N to DRV6N) to the ADRM input. This allows up to 20 subsystem addresses to be generated for the REMO output (bits S3, S2, S1 and S0) as shown in Table 1 and Fig.3. The transmission mode is defined by the DRV6N to ADRM connection as follows: • Mode 1 • Mode 2 DRV6N not connected to ADRM DRV6N connected to ADRM SAA3008 while the command key is pressed. A chance of the subsystem address does not start a transmission. In a multiple keystroke sequence (Fig.6) the second word B might be transmitted with subsystem address 18 or 19 instead of the preselected subsystem address (Table 1). This is only relevant for systems decoding subsystem address 18 or 19. Remote control signal output (REMO) The REMO output driver stage incorporates a bipolar emitter-follower which allows a high output current in the output active (HIGH) state (Fig.7). The information is defined by the distance ‘tb’ between the leading edges of the modulated pulses (Fig.4). The distance tb is a multiple of the basic unit To (Table 3) which equals 1152 periods of the oscillator frequency fosc (Table 3). The pulses are modulated with 6 periods of 1⁄12 of the oscillator frequency (38 kHz). The format of the output data is illustrated in Figs 3 and 4. A data word starts with the reference time and toggle bit T0 and is followed by the definition bits for the subsystem address S3, S2, S1 and S0 (bit S3 is transmitted only for subsystem addresses 8 to 20). The selected command key is defined by bits F, E, D, C, B and A as shown in Table 2. The toggle bit T0 acts as an indication for the decoder whether the next instruction should be considered as a new command or not. The codes for the subsystem address and the selected key are given in Table 3. In Mode 1 the reference time REF equals 3To, this may be used as a reference time for the decoding sequence. In Mode 2 an additional modulated pulse has been inserted into the middle of the reference time, therefore, these pulses are now separated by 1.5To. This unique start .


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