IR Receiver Modules for Data Transmission

Transcription

1 IR Receiver Modules for Data Transmission 2 DESIGN SUPPORT TOOLS Models Available MECHANICAL DATA Pinning for : = OUT, 2 = GND, 3 = V S click logo to get started FEATURES Very low supply current Continuous data rates up to 7777 bps Range up to 32 m Photo detector and preamplifier in one package Internal filter tuned to 38.4 khz for 48 bps or 57.6 khz for 96 bps Shielding against EMI Supply voltage: 2.5 V to 5.5 V Immunity against ambient light Insensitive to supply voltage ripple and noise Material categorization: for definitions of compliance please see DESCRIPTION These products are miniaturized receivers for low speed infrared data transmission. A PIN diode and a preamplifier are assembled on a lead frame, the epoxy package contains an IR filter. The demodulated output can be directly connected to a UART or a microprocessor. The TSDP3438 may be used for continuous reception of data according to RS-232 at 48 bps in noise free environments. Higher data rate RS-232 may require data monitoring of gain levels. Non RS-232 codings may be used to achieve continuous average data rates up to 78 bps in noisy ambients. This component has not been qualified according to automotive specifications. PARTS TABLE AGC LOW NOISE ENVIRONMENTS (AGC) NOISY ENVIRONMENTS (AGC3) Carrier 38.4 khz TSDP3438 TSDP34338 frequency 57.6 khz TSDP3456 TSDP34356 Package Mold Pinning = OUT, 2 = GND, 3 = V S = OUT, 2 = GND, 3 = V S Dimensions (mm) Mounting Application 6. W x 6.95 H x 5.6 D Leaded Data transmission BLOCK DIAGRAM APPLICATION CIRCUIT Input AGC Demo- dulator Band pass 3 kω Transmitter with TSALxxxx IR receiver Circuit V S OUT GND R C V O μc + V S GND PIN Control circuit 2 R and C recommended to reduce supply ripple for V S < 2.8 V Rev..2, -Apr-8 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

2 ABSOLUTE MAXIMUM RATINGS PARAMETER TEST CONDITION SYMBOL VALUE UNIT Supply voltage V S -.3 to +6 V Supply current I S 3 ma Output voltage V O -.3 to (V S +.3) V Output current I O 5 ma Junction temperature T j C Storage temperature range T stg -25 to +85 C Operating temperature range T amb -25 to +85 C Power consumption T amb 85 C P tot mw Soldering temperature t s, mm from case T sd 26 C Note Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect the device reliability ELECTRICAL AND OPTICAL CHARACTERISTICS (T amb = 25 C, unless otherwise specified) PARAMETER TEST CONDITION SYMBOL MIN. TYP. MAX. UNIT E v =, V S = 3.3 V I SD ma Supply current E v = 4 klx, sunlight I SH ma Supply voltage V S V Transmission distance Output voltage low Minimum irradiance Maximum irradiance E v =, test signal see Fig., IR diode TSAL62, I F = 5 ma I OSL =.5 ma, E e =.7 mw/m 2, test signal see Fig. Pulse width tolerance: t pi - /f < t po < t pi + 4/f, test signal see Fig. t pi - /f < t po < t pi + 4/f, test signal see Fig. d m V OSL - - mv E e min mw/m 2 E e max W/m 2 Maximum pulse width E e min. > mw/m 2, t pi = 8/f t po max /f s Directivity Angle of half transmission distance ϕ /2 - ± 45 - deg TYPICAL CHARACTERISTICS (T amb = 25 C, unless otherwise specified) V O E e V OH Optical Test Signal (IR diode TSAL62, I F =.4 A, N = 6 pulses, f = f, t = ms) t pi *) Output Signal V OL t ) tpo 2) t d T *) t pi 6/f is recommended for optimal function ) 3/f < t d < 9/f 2) t pi - /f < t po < t pi + 4/f t t po -Output Pulse Width (ms) Output pulse width Input burst length.5 Optical test signal, λ = 94 nm, f = 38 khz, N = 8 carrier cycles.. E e - Irradiance (mw/m 2 ) Fig. - Output Active Low Fig. 2 - Pulse Length and Sensitivity in Dark Ambient Rev..2, -Apr-8 2 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

3 E e V O V OH V OL Optical Test Signal 2 µs 2 µs t = 6 ms Output Signal, (see fig. 4) t on t off t t E e min. -Threshold Irradiance (mw/m 2 ) Correlation with ambient light sources: W/m 2 =.4 klx (Std. ilum. A, T = 2855 K) W/m 2 = 8.2 klx (Daylight, T = 59 K) Wavelength of ambient illumination: λ = 95 nm.. E e - Ambient DC Irradiance (W/m 2 ) Fig. 3 - Output Function Fig. 6 - Sensitivity in Bright Ambient t on, t off -Output Pulse Width (ms).4.3 t on.2 t off. λ = 94 nm, f = 38 khz. E e - Irradiance (mw/m 2 ) E e min. -Threshold Irradiance (mw/m 2 ) f = f f = 3 khz f = khz f = Hz ΔV S RMS - AC Voltage on DC Supply Voltage (mv) Fig. 4 - Output Pulse Diagram Fig. 7 - Sensitivity vs. Supply Voltage Disturbances E e min. /E e - Rel. Responsivity f = f.2 ± 5 % f (3 db) = f / f/f - Relative Frequency Max. Envelope Duty Cycle TSDP343.. f = 38 khz, E e = 2 mw/m² TSDP Burst Length (Number of Cycles/Burst) Fig. 5 - Frequency Dependence of Responsivity Fig. 8 - Maximum Envelope Duty Cycle vs. Burst Length Rev..2, -Apr-8 3 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

4 E e min. -Threshold Irradiance (mw/m 2 ) T amb - Ambient Temperature ( C) p2 d rel - Relative Transmission Distance Fig. 9 - Sensitivity vs. Ambient Temperature Fig. - Horizontal Directivity S (λ) rel - Relative Spectral Sensitivity λ- Wavelength (nm) E e min. - Sensitivity (mw/m 2 ) V S - Supply Voltage (V) Fig. - Relative Spectral Sensitivity vs. Wavelength Fig. 2 - Sensitivity vs. Supply Voltage Rev..2, -Apr-8 4 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

5 SUITABLE DATA FORMAT Theses receivers are designed to suppress spurious output pulses due to noise or optical disturbances. The devices can distinguish data signals from noise due to differences in frequency, burst length, and envelope duty cycle. For optimum sensitivity, the data s modulation frequency should be close to the device s band-pass center frequency (e.g khz) and fulfill the conditions in the table below. When a data signal is applied to the receiver in the presence of noise, the sensitivity of the receiver is automatically reduced by the AGC to insure that no spurious pulses are present at the receiver s output. Some examples of noise which is suppressed: DC light (e.g. from tungsten bulbs sunlight) Continuous signals at any frequency Strongly or weakly modulated patterns from fluorescent lamps with electronic ballasts (see Fig. 3 or Fig. 4). IR Signal Amplitude Axis Title Time (ms) Fig. 3 - IR Disturbance from Fluorescent Lamp With Low Modulation st line 4 Axis Title 2 IR Signal Amplitude -2 st line Time (ms) Fig. 4 - IR Disturbance from Fluorescent Lamp With High Modulation TSDP34.. TSDP343.. Minimum burst length 6 cycles/burst 6 cycles/burst After each burst of length A gap time is required of For bursts greater than a minimum gap time in the data stream is needed of 6 to 7 cycles 7 cycles 7 cycles >.2 x burst length 6 to 35 cycles 7 cycles 35 cycles > 6 x burst length Maximum number of continuous short bursts/second 3 3 Suppression of interference from fluorescent lamps Mildly modulated noise patterns are suppressed (Fig. 3) Strongly modulated noise patterns are suppressed (Fig. 4) Rev..2, -Apr-8 5 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

6 PACKAGE DIMENSIONS in millimeters (5.55) ± max max..7 max nom nom marking area Not indicated tolerances ±.2 Drawing-No.: Issue: 9; R 2.5 technical drawings according to DIN specifications Rev..2, -Apr-8 6 Document Number: ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT

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