LNBH25 STMicroelectronics, LNBH25 Datasheet
LNBH25
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LNBH25 Summary of contents
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... Order code LNBH25PQR February 2012 Description Intended for analog and digital satellite receivers/Sat-TV and Sat-PC cards, the LNBH25 is a monolithic voltage regulator and interface IC, assembled in QFN24 4x4 specifically designed to provide the 13/18 V power supply and the 22 kHz tone signalling to the LNB down-converter in the antenna dish or to the multi-switch box ...
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... PNG: input voltage minimum detection . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.18 ISW: inductor switching current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.19 COMP: boost capacitor ESR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.20 OLF: overcurrent and short-circuit protection and diagnostic . . . . . . . . . . . 9 2.21 OTF: thermal protection and diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 5 Typical application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6 I²C bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/34 Doc ID 022433 Rev 4 LNBH25 ...
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... LNBH25 6.1 Data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.2 Start and stop condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.3 Byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.4 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6.5 Transmission without acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7 I²C interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.1 Write mode transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.2 Read mode transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 7.3 Data registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 7.4 Status registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 9 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Doc ID 022433 Rev 4 Contents ...
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... Block diagram DSQIN DETIN DSQOUT FLT BPSW 4/34 ADDR SCL SDA I2C Digital core Tone detector DAC Drop control Tone ctrl Diagnostics Protections Current Limit selection Voltage reference GND BYP VCC ISEL Doc ID 022433 Rev 4 LNBH25 LX PGND VUP Linear VOUT Regulator AM10400v1 ...
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... DSQIN pin function. Before sending the TTL signal on the DSQIN pin, the EXTM and TEN bits must be previously set to “1”. As soon as the DSQIN internal circuit detects the 22 kHz TTL external signal code, the LNBH25 activates the 22 kHz tone on the V activation, and it stops with about 60 µ ...
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... LPM (low power mode) In order to reduce total power loss, the LNBH25 is provided with the LPM I²C bit that can be activated (LPM=1) in applications where the 22 kHz tone can be disabled for long time periods. The LPM bit can be set to “1” when the DiSEqC data transmission is not requested (no 22 kHz tone output is present) ...
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... Diagnostic and protection functions LNBH25 has 8 diagnostic internal functions provided via the I²C bus, by reading 8 bits on two STATUS registers (in read mode). All the diagnostic bits are, in normal operation (that is no failure detected), set to LOW. Two diagnostic bits are dedicated to the overtemperature ...
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... Application information 2.9 Surge protections and TVS diodes The LNBH25 device is directly connected to the antenna cable in a set-top box. Atmospheric phenomenon can cause high voltage discharges on the antenna cable causing damage to the attached devices. Surge pulses occur due to direct or indirect lightning strikes to an external (outdoor) circuit ...
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... EN_IMON=1, the V independently on the VSEL bit setting. This operation is applied in order to be sure that the LNBH25 output has the higher voltage present in the LNB bus. Do not use this function in an application environment where 21 V voltage level is not supported by other peripherals connected to the LNB bus ...
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... OTF: thermal protection and diagnostic The LNBH25 is also protected against overheating: when the junction temperature exceeds 150 °C (typ.), the step-up converter and the linear regulator are shut off, the diagnostic OTF bit in the STATUS1 register is set to “1” and the FLT pin is set to low level. After the overtemperature condition is removed, normal operation can be resumed in two ways, according to the THERM I² ...
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... LNBH25 3 Pin configuration Figure 5. Pin connections (top view PGND PGND ADDR ADDR Table 2. Pin description Pin n° Symbol 2 FLT 3 LX N-MOS drain 4 P-GND Power ground 6 ADDR Address setting 7 SCL Serial clock 8 SDA Serial data 9 ISEL ...
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... It can be used as DiSEqC envelope input or external 22 kHz TTL input depending on the EXTM I²C bit setting as follows: EXTM=0, TEN=1: it accepts the DiSEqC envelope code from the main microcontroller. The LNBH25 uses this code to modulate the input internally generated 22 kHz carrier. or ...
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... LNBH25 4 Maximum ratings Table 3. Absolute maximum ratings Symbol V DC power supply input voltage pins input voltage UP I Output current OUT V DC output pin voltage OUT V Logic input pins voltage (SDA, SCL, DSQIN, ADDR pins Logic output pins voltage (FLT, DSQOUT) ...
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... A - GND 4 Table 13 and ISEL pin description in > < 0 placed as close as possible > I where I sat peak peak Doc ID 022433 Rev 4 Vout FLT 2 Byp Notes Table 2 (AV) > 0 pin. OUT is the boost converter peak current. LNBH25 to LNB AM10431v1 ...
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... I L2 220 µH inductor. 2STR2160 or 2STF2340 or any small power PNP with, IC > 250 mA used. TR1 Also any small power PMOS with ID > 250 mA, R used Vup LNBH25 Vcc 17 C4 DSQIN 22 ADDR SDA Bus SCL ...
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... I²C bus interface 6 I²C bus interface Data transmission from the main microprocessor to the LNBH25 and vice versa takes place through the 2-wire I²C bus interface, consisting of the 2-line SDA and SCL (pull-up resistors to positive supply voltage must be externally connected). 6.1 Data validity ...
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... LNBH25 Figure 8. Data validity on the I²C bus Figure 9. Timing diagram of I²C bus Figure 10. Acknowledge on the I²C bus Doc ID 022433 Rev 4 I²C bus interface 17/34 ...
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... The transfer lasts until a stop bit is encountered ● the LNBH25, as slave, acknowledges every byte transfer. Figure 11. Example of writing procedure starting with first data address 0x2 CHIP ADDRESS CHIP ADDRESS ...
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... LSB bit R/W=1 ● after the acknowledge the LNBH25 starts to send the addressed register content. As long as the master keeps the acknowledge LOW, the LNBH25 transmits the next address register byte content. ● ...
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... DSQIN input pin is set to receive external 22 kHz TTL signal source DSQIN input pin is set to receive external DiSEqC envelope TTL signal Reserved. Keep to “0” Reserved. Keep to "0" Reserved. Keep to "0" Reserved. Keep to "0" Reserved. Keep to "0" Doc ID 022433 Rev 4 Description Table 14 ) Description LNBH25 ...
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... LNBH25 Table 9. DATA 3 (Read/Write register. Register address = 0X4) BIT Name Value 1 Bit 0 ISET (LSB Bit 1 ISW 0 1 Bit 2 PCL 0 1 Bit 3 TIMER 0 Bit 4 N/A 0 Bit 5 N/A 0 Bit 6 N/A 0 Bit 7 N/A 0 (MSB) N/A = Reserved bit. All bits reset power-on. Table 10. ...
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... LPD thresholds. Refer to CC Doc ID 022433 Rev 4 Description OUT UP Description > Refer to OUT MAX pin (I < I OUT OUT MAX > 150 °C. See also THERM bit setting in J < 135 ° below thermal J J Table 13 LNBH25 pin) is pin) UP pin) Table 9 for ). Table ...
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... LNBH25 Table 12. STATUS 2 (Read register. Register address = 0X1) BIT Name Value 1 Bit 0 TDET (LSB) 0 Bit 1 N Bit 2 TMON 0 Bit 3 N Bit 4 IMON 0 Bit 5 N/A - Bit 6 N/A - Bit 7 N/A - (MSB) N/A = Reserved bit. All bits reset power-on. 22 kHz tone presence is detected on the DETIN pin No 22 kHz tone is detected on the DETIN pin Reserved 22 kHz tone present on the DETIN pin is out of TMON specification thresholds ...
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... Section 7 ). Min. Typ. Max -3.5 +3.5 100 750 1100 500 750 350 550 500 350 250 500 4 6 1.5 1.5 900 T /10 OFF T /5 OFF 0.55 0.675 0 LNBH25 Unit kHz µs % ...
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... LNBH25 Table 13. Electrical characteristics (continued) Symbol Parameter DC-DC converter switching F SW frequency Undervoltage lockout UVLO thresholds Low power diagnostic (LPD thresholds V DSQIN, pin logic low IL V DSQIN, pin logic high IH I DSQIN, pin input current IH Tone detector frequency F DETIN (3) capture range ...
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... V. I Test conditions SDA, SCL SDA, SCL SDA, SCL 0 (1) SDA (open drain SCL Doc ID 022433 Rev 4 LNBH25 (1) Function V disabled. LNBH25 set in standby OUT mode Min. Typ. Max. 0.8 2 -10 10 0.6 400 Unit V V µA V kHz ...
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... LNBH25 T from ° Table 16. Address pin characteristics Symbol Parameter “0001000(R/W)” Address pin V ADDR-1 voltage range “0001001(R/W)” Address pin V ADDR-2 voltage range Refer to Section 5 DSQIN = LOW, V referred ° access to the system register. Table 17. Output voltage diagnostic (VMON bit, STATUS 1 register) characteristics ...
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... Test condition DETIN pin AC coupled DETIN pin AC coupled DETIN pin AC coupled Doc ID 022433 Rev mA, unless IN OUT = 25 ° pin voltage. See J OUT OUT Min. Typ. 200 300 900 1100 13 16.5 24 29.5 LNBH25 Max. Unit 400 mV 1200 mV 20 kHz 38 kHz ...
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... LNBH25 9 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ® ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at trademark. Table 20. QFN24L ( mm) mechanical data Dim ...
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... Package mechanical data Figure 13. QFN24L ( mm) package dimensions 30/34 Doc ID 022433 Rev 4 LNBH25 7596209_D ...
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... LNBH25 Tape & reel QFNxx/DFNxx (4x4) mechanical data Dim. Min 12 mm. Typ. Max. Min. 330 13.2 0.504 0.795 101 3.898 14.4 4.35 4.35 1 Doc ID 022433 Rev 4 Package mechanical data inch. Typ. Max. 12.992 0.519 3.976 0.567 0.171 0.171 0.043 ...
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... Package mechanical data Figure 14. QFN24L ( footprint recommended data (mm.) 32/34 Doc ID 022433 Rev 4 LNBH25 ...
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... LNBH25 10 Revision history Table 21. Document revision history Date Revision 09-Nov-2011 1 01-Dec-2011 2 13-Jan-2012 3 15-Feb-2012 4 Initial release. Updated mechanical data Table 20 on page 29 Section 2.9 Figure 4 on page 8 Added and Modified: header Table 14 on page 26 Modified: D1, D3 Table 5 on page 14 Doc ID 022433 Rev 4 Revision history ...
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... Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America 34/34 Please Read Carefully: © 2012 STMicroelectronics - All rights reserved STMicroelectronics group of companies www.st.com Doc ID 022433 Rev 4 LNBH25 ...