lnbs21 STMicroelectronics, lnbs21 Datasheet
lnbs21
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lnbs21 Summary of contents
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... LNB SHORT CIRCUIT PROTECTION AND DIAGNOSTIC CABLE LENGTH DIGITAL COMPENSATION INTERNAL OVER TEMPERATURE PROTECTION DESCRIPTION Intended for analog and digital satellite STB receivers/SatTV, sets/PC cards, the LNBS21 is a monolithic voltage regulator and interface IC, Figure 1: Schematic Diagram Gate Sense Vup Vcc Byp ...
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... LNBS21 post-regulator to work at a minimum dissipated power. An UnderVoltage Lockout circuit will disable the whole circuit when the supplied V drops below a fixed threshold (6.7V typically). The internal 22KHz tone generator is factory trimmed in accordance to the standards, and can controlled either by the I C dedicated pin (DSQIN) that allows immediate ...
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... Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3: Thermal Data Symbol R Thermal Resistance Junction-case thj-case Figure 2: Pin Connection (top view) PowerSO-20 (Tube) LNBS21PD Parameter Parameter PowerSO-20 LNBS21 PowerSO-20 (Tape & Reel) LNBS21PD-TR Value Unit Internally Limited ...
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... C bus. When the TEN bit of the System Register is LOW, this pin will accept the DiSEqC code from the main controller. The LNBS21 will use this code to modulate the internally generated 22kHz carrier. Set to GND the pin if not used. 22kHz Tone Detector Input. Must be AC coupled to the DiSEqC bus ...
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... STOP information in order to abort the transfer. The LNBS21 won't generate the acknowledge if the V supply is below the Undervoltage Lockout CC threshold (6.7V typ.). TRANSMISSION WITHOUT ACKNOWLEDGE Avoiding to detect the acknowledge of the LNBS21, the µP can use a simpler transmission: LNBS21 Master STB C7 10nF 270µH to LNB D2 ...
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... LNBS21 simply it waits one clock without checking the slave acknowledging, and sends the new data. Figure 4: Data Validity On The I Figure 5: Timing Diagram On I Figure 6: Acknowledge On I 6/21 This approach of course is less protected from misworking and decreases the noise immunity Bus 2 C Bus ...
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... Values are typical unless otherwise specified 2 RECEIVED DATA (I C bus READ MODE) The LNBS21 can provide to the Master a copy of the SYSTEM REGISTER information via I in read mode. The read mode is Master activated by sending the chip address with R/W bit set the following master generated clocks bits, the LNBS21 issues a byte on the SDA data bus line (MSB transmitted first) ...
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... OUT OMAX PWK data in accordance to the DiSEqC protocol. Full compliance of the system to the specification is thus not implied by the bare use of the LNBS21. The system designer should also take in consideration the bus hardware requirements, that include the source impedance of the Master Transmitter measured at 22KHz. To limit the ...
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... OFF 0.55 0.72 0 400 260 =12 or 0.35 0.6 220 18 24 0.2 1.5 150 0.3 0 -10 150 15 LNBS21 Unit KHz Vpp % s mVpp V kHz kHz Vpp °C °C 9/21 ...
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... SDA, SCL SDA, SCL 0.4 to 4.5v IN SDA (open drain 6mA 85°C, V =12V Test Conditions 1N4001 Vup 470nF Gate Sense R sc OUT 0.1 LNBS21 Vcc 470nF EXTM SDA SCL DETIN DSQIN 470nF DSQOUT BYP ADDRESS =12V) IN Min. Typ. 4.5 4.5 200 =12V) Min. ...
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... TYPICAL CHARACTERISTICS (unless otherwise specified T Figure 8: Output Voltage vs Temperature Figure 9: Output Voltage vs Temperature Figure 10: Line Regulation vs Temperature = 25°C) j Figure 11: Line Regulation vs Temperature Figure 12: Load Regulation vs Temperature Figure 13: Load Regulation vs Temperature LNBS21 11/21 ...
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... LNBS21 Figure 14: Supply Current vs Temperature Figure 15: Supply Current vs Temperature Figure 16: Dynamic Overload Protection ON Time vs Temperature 12/21 Figure 17: Dynamic Overload Protection OFF Time vs Temperature Figure 18: Output Current Limiting vs Temperature Figure 19: Output Current Limiting vs Temperature ...
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... Figure 20: Tone Frequency vs Temperature Figure 21: Tone Amplitude vs Temperature Figure 22: Tone Duty Cycle vs Temperature Figure 23: Tone Rise Time vs Temperature Figure 24: Tone Fall Time vs Temperature Figure 25: Loopthrought Switch Drop Voltage vs Temperature LNBS21 13/21 ...
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... LNBS21 Figure 26: Loopthrought Switch Drop Voltage vs Temperature Figure 27: Loopthrought Switch Drop Voltage vs Loopthrought Current Figure 28: Loopthrought Switch Drop Voltage vs Loopthrought Current 14/21 Figure 29: DSQOUT Pin Logic Low vs Temperature Figure 30: Undervoltage Lockout Threshold vs Temperature Figure 31: Output Backward Current vs Temperature ...
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... Figure 33: Current Limit Sense vs Temperature Figure 34: 22kHz Tone V =12V, I =50mA, EN=TEN Figure 35: DSQIN Tone Enable Transient Response V =12V, I =50mA, EN=1, TEN Figure 36: DSQIN Tone Enable Transient Response V =12V, I =50mA, EN=1, TEN Figure 37: DSQIN Tone Disable Transient Response V =12V, I =50mA, EN=1, TEN LNBS21 15/21 ...
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... LNBS21 Figure 38: Output Voltage Transient Response from 13V to 18V V =12V, I =50mA, VSEL=from EN TERMAL DESIGN NOTES During normal operation, this device dissipates some power. At maximum rated output current (500mA), the voltage drop on the linear regulator lead to a total dissipated power that is of about 1 ...
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... Figure 40: SO-20 Suggested Pcb Heatsink Layout Figure 41: PowerSO-20 Suggested Pcb Heatsink Layout LNBS21 17/21 ...
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... LNBS21 DIM. MIN 0. 0.40 c 0.23 D (1) 15.80 E 13. (1) 10. 0. 0˚ T (1) “D and E1” do not include mold flash or protusions - Mold flash or protusions shall not exceed 0.15mm (0.006” DETAIL 45˚ 18/21 PowerSO-20 MECHANICAL DATA mm ...
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... Tape & Reel PowerSO-20 MECHANICAL DATA DIM. MIN 12 15.1 Bo 16.5 Ko 3.8 Po 3.9 P 23.9 W 23.7 mm. TYP MAX. 330 13.2 0.504 0.795 2.362 30.4 15.3 0.594 16.7 0.650 4.0 0.149 4.1 0.153 24.1 0.941 24.3 0.933 inch MIN. TYP. MAX. 12.992 0.519 1.197 0.602 0.658 0.157 0.161 0.949 0.957 LNBS21 19/21 ...
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... LNBS21 Table 9: Revision History Date Revision 05-Oct-2004 3 20/21 Description of Changes Mistake Pin 6 - Table 4. ...
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