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november 2010 doc id 15335 rev 4 1/25 25 lnbh23l lnb supply and control ic wit h step-up and i2c interface features complete interface between lnb and i2c bus built-in dc-dc converter for single 12 v supply operation and high efficiency (typ. 93% @ 0.5 a) selectable output current limit by external resistor compliant with main sate llite receivers output voltage specification auxiliary modulation input (extm pin) facilitates diseqc? 1.x encoding accurate built-in 22 khz tone generator suits widely accepted standards low-drop post regulator and high efficiency step-up pwm with integrated power nmos allow low power losses overload and over-temperature internal protections with i2c diagnostic bits lnb short circuit dynamic protection 4 kv esd tolerant on output power pins applications stb satellite receivers tv satellite receivers pc card satellite receivers description intended for analog and di gital satellite receivers, the lnbh23l is a monolithic voltage regulator and interface ic, assembled in qfn32 5 x 5 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. in this application field, it offers a complete solu tion with extremely low component count, low power dissipation together with simple design and i2c standard interfacing. qfn32 (5 x 5 mm) (exposed pad) table 1. device summary order code package packaging LNBH23LQTR qfn32 (5 x 5 mm) exposed pad tape and reel www.st.com
contents lnbh23l 2/25 doc id 15335 rev 4 contents 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1 diseqc? data encoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.2 diseqc? 1.x implementation by extm pin . . . . . . . . . . . . . . . . . . . . . . . 5 2.3 diseqc? 1.x implementation with vo tx and extm pin connection . . . . 5 2.4 pdc optional circuit for diseqc? 1.x applications using votx signal on to extm pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.5 i2c interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.6 output voltage selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.7 diagnostic and protection functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.8 over-current and short circuit protection and diagnostic . . . . . . . . . . . . . . 6 2.9 thermal protection and diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.10 output current limit selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 5 typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6 i2c bus interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.1 data validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.2 start and stop condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.3 byte format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.4 acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 6.5 transmission without acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 lnbh23l software description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.1 interface protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.2 system register (sr, 1 byte) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.3 transmitted data (i2c bus write mode) . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7.4 diagnostic received data (i2c read mode) . . . . . . . . . . . . . . . . . . . . . . . . 17
lnbh23l contents doc id 15335 rev 4 3/25 7.5 power-on i2c interface reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.6 address pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.7 diseqc? implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8 electrical characteristi cs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 9 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 10 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
block diagram lnbh23l 4/25 doc id 15335 rev 4 1 block diagram figure 1. block diagram sda scl lnbh23l addr i 2 c olf and otf diagnostics dsqin vup vorx votx lx 22khz oscill. pwm controller rsense en vsel linear post-reg +protections +diagnostics ttx en vsel vout control extm preregulator +u.v.lockout +p.on reset byp v cc v cc-l isel ttx ten ttx vup . . a-gnd + fb pdc pull down controller vup . p-gnd + i 2 c interface . . + sda scl lnbh23l addr i 2 c olf and otf diagnostics dsqin vup vorx votx lx 22khz oscill. pwm controller rsense en vsel linear post-reg +protections +diagnostics ttx en vsel vout control extm preregulator +u.v.lockout +p.on reset byp v cc v cc-l isel ttx ten ttx vup . . a-gnd + fb pdc pull down controller vup . p-gnd + i 2 c interface . . +
lnbh23l application information doc id 15335 rev 4 5/25 2 application information this ic has a built-in dc-dc step-up converter that, from a single source from 8 v to 15 v, generates the voltages (v up ) that let the linear post-regulator to work at a minimum dissipated power of 0.55 w typ. @ 500 ma load (the linear post-regulator drop voltage is internally kept at v up - v out = 1.1 v typ.). an under voltag e lockout circuit will disable the whole circuit when the supplied v cc drops below a fixed threshold (6.7 v typically). note: in this document the v out is intended as the voltage present at the linear post-regulator output (v orx pin). 2.1 diseqc? data encoding the internal 22 khz tone generator is factory trimmed in accordance to the standards, and can be selected by i2c interface ttx bit (or ttx pin) and activated by a dedicated pin (dsqin) that allows immediate diseqc? data encoding, or through ten i2c bit in case the 22 khz presence is requested in continuous mode. in stand-by condition (en bit low) the ttx function must be disabled setting ttx to low. besides the internal 22 khz tone generator, the auxiliary modulati on pin (extm) can be driven by an external 22 khz source and in this case ttx must be set to low. 2.2 diseqc? 1.x implementation by extm pin in order to improve design fl exibility and reduce the total a pplication cost, an analogic modulation input pin is available (extm) to generate the 22 khz tone superimposed to the v orx dc output voltage. an appropriate dc blocking capacitor must be used to couple the modulating signal source to the extm pin. if the extm solution is used the output r-l filter can be removed (see figure 5 ) saving the external components cost. if this configuration is used keep ttx set to low. the pin extm modulates the v orx voltage through the series decoupling capacitor, so that: v orx(ac) = v extm(ac) x g extm where v orx(ac) and v extm(ac) are, respectively, the peak to peak voltage on the v orx and extm pins while g extm is the voltage gain from extm to v orx . 2.3 diseqc? 1.x implementation with v otx and extm pin connection if an external 22 khz tone source is not available, it is possible to use the internal 22 khz tone generator signal available through the v otx pin to drive the extm pin. the v otx pin internal circuit must be preventively set on by setting the ttx function to high. this can be controlled both through the ttx pin or by i2c bit. by this way the v otx 22 khz signal will be superimposed to the v orx dc voltage to generate the lnb output 22 khz tone (see figure 3 ). after ttx is set to high the internal 22 khz tone generator available through the v otx pin can be activated during the 22 khz transmission either by dsqin pin or by the ten bit.the dsqin internal circuit activates the 22 khz tone on the v otx output with 0.5 cycles 25 s delay from the ttl signal presence on the dsqin pin, and it stops with 1 cycles 25 s delay after the ttl signal is expired. as soon as the tone transmission is expired, the
application information lnbh23l 6/25 doc id 15335 rev 4 v otx internal circuits must be disabled by setting the ttx to low. the 13 / 18 v power supply will be always provided to the lnb from the v orx pin. 2.4 pdc optional circuit for diseqc? 1.x applications using v otx signal on to extm pin in some applications, at light output current (< 50 ma) having heavy lnb output capacitive load, the 22 khz tone can be distorted. in this case it is possible to add the "optional" external components shown in the typical application circuits (see figure 4 ) connected between v orx and pdc pin. this optional circuit acts as an active pull-down discharging the output capacitance only when the internal 22 khz tone is activated. this optional circuit is not needed in standard applications having i out > 50 ma and capacitive load up to 250 nf. 2.5 i2c interface the main functions of the ic are controlled via i2c bus by writing 6 bits on the system register (sr 8 bits in write mode). on the same register there are 5 bits that can be read back (sr 8 bits in read mode) to provide the diagnostic flags of two internal monitoring functions (otf, olf) and three output voltage regist er status (en, vsel, llc) received by the ic (see below diagnostic functions section). in read mode there are 3 test bits (test 1 - 2 - 3) that must be disregarded from the mcu. while, in write mode, 2 test bits (test 4 - 5) must be always set low. 2.6 output voltage selection when the ic sections are in stand-by mode (en bit low), the power blocks are disabled. when the regulator blocks are active (en bit high), the output can be logic controlled to be 13 or 18 v by means of the v sel bit (voltage select). additionally, the lnbh23l is provided with the llc i2c bit that increases the selected voltage value to compensate possible voltage drop along the output line. the lnbh23l is also compliant to the usa lnb power supply standards. in stand-by condition (en bit low) all the i2c bits and the ttx pin must be set low (if the ttx pin is not used it can be left floating or to gnd but the ttx bit must be set low during the stand-by condition). 2.7 diagnostic and protection functions the lnbh23l has two diagnostic internal function s provided via i2c bus by reading 2 bits on the system register (sr bits in read mode). the diagnostic bits are, in normal operation (no failure detected), set to low. the diagnostic bits are dedicated to the over-temperature and over-load protections status (otf and olf). 2.8 over-current and short circuit protection and diagnostic in order to reduce the total power dissipation during an overload or a short circuit condition, the device is provided with a dynamic short circ uit protection. it is possible to set the short circuit current protection either statically (simple current clamp) or dynamically by the pcl bit of the i2c sr. when the pcl (pulsed current limiting) bit is set lo low, the over current protection circuit works dynamically: as soon as an overload is detected, the output is shut-
lnbh23l application information doc id 15335 rev 4 7/25 down for a time t off , typically 900 ms. simultaneously the diagnostic olf i2c bit of the system register is set to "1". after this time has elapsed, the output is resumed for a time t on = 1/10 t off = 90 ms (typ.). at the end of t on , if the overload is still detected, the protection circuit will cycle again through t off and t on . at the end of a full t on in which no overload is detected, normal operation is resumed and the olf diagnostic bit is reset to low. typical t on + t off time is 990ms and an internal timer determines it. this dynamic operation can greatly reduce the power dissipat ion in short circuit condition, still ensuring excellent power-on start-up in most conditions. however, there could be some cases in which a highly capacitive load on the output may cause a difficult start-up when the dynamic protection is chosen. this can be solved by initiating any power start-up in static mode (pcl = 1) and, then, switching to the dynamic mode (pcl = 0) after a chosen amount of time depending on the output capacitance. when in static mode, the diagnostic olf bit goes to "1" when the current clamp limit is reached and returns low when the overload condition is cleared. 2.9 thermal protection and diagnostic the lnbh23l is also protected against ov erheating: when the junction temperature exceeds 150 c (typ.), the step-up converter and the liner regulator are shut-off, and the diagnostic otf sr bit is set to "1". normal operation is resumed and the otf bit is reset to low when the junction is cooled down to 135 c (typ.) 2.10 output current limit selection the linear regulator current limit threshold can be set by an external resistor connected to isel pin. the resistor value defines the output current limit by the equation: i max (a) = 10000 / r sel where r sel is the resistor connected between i sel and gnd. the highest selectable current limit threshold shall be 0.65 a typ with r sel = 15 k . the above equation defines the typical threshold value. note: external components are needed to comply diseqc? bus hardware requirements. full compliance of the whole application with diseqc? specifications is not implied by the bare use of this ic. notice: diseqc? is a trademark of eutelsat.
pin configuration lnbh23l 8/25 doc id 15335 rev 4 3 pin configuration figure 2. pin connections (bottom view) table 2. pin description pin n symbol name pin function 19 v cc supply input 8 to 15 v ic dc-dc power supply. 18 v cc? l supply input 8 to 15 v analog power supply. 4 lx nmos drain integrated n-channel power mosfet drain. 27 v up step-up voltage input of the linear post-regulator. the voltage on this pin is monitored by the internal step-up controller to keep a minimum dropout across the linear pass transistor. 21 v orx ldo output port output of the integrated low drop linear regulator. see truth tables for voltage selections and description. 22 v otx output port for 22 khz tone tx tx output to the lnb. see truth tables for selection. 6 sda serial data bi-directional data from/to i2c bus. 9 scl serial clock clock from i2c bus. 12 dsqin diseqc input this pin will accept the diseqc code from the main controller. the lnbh23l will use this code to modulate the internally generated 22 khz carrier. set to ground if not used. 14 ttx ttx enable this pin can be used, as well as the ttx i2c bit of the system register, to control the ttx function enable before to start the 22 khz tone transmission. set fl oating or to gnd if not used. 29 reserved reserved to be connected to gnd. 11 pdc pull down control to be connected to the external npn transistor base to reduce the 22 khz tone distortion in case of heavy capacitive load at light output current. if not us ed it can be left floating. 13 extm external modulation external modulation input acts on v orx linear regulator output to superimpose an external 22 khz signal. needs dc decoupling to the ac source. if not used it can be left floating. 5 p-gnd power ground dc-dc converter power ground.
lnbh23l pin configuration doc id 15335 rev 4 9/25 pin n symbol name pin function epad epad exposed pad to be connected with power grounds and to the ground layer through vias to dissipate the heat. 20 a-gnd analog ground analog circuits ground. 15 byp by-pass capacitor needed for internal pre-regulator filtering. the byp pin is intended only to connect an external ceramic capacitor. any connection of this pin to external current or voltage sources may cause permanent damage to the device. 10 addr address setting two i2c bus addresses available by setting the address pin level voltage. see address pin characteristics table. 28 isel current selection the resistor ?rsel? connected between isel and gnd defines the linear regulator current limit threshold by the equation: i max (typ.) = 10000 / rsel. 30 reserved reserved to be left floating. do not connect to gnd. 1, 2, 3, 7, 8, 16, 17, 23, 24, 25, 26, 31, 32 n.c. not internally connected not internally connected pins. these pins can be connected to gnd to improve thermal performances. table 2. pin description (continued)
maximum ratings lnbh23l 10/25 doc id 15335 rev 4 4 maximum ratings table 3. absolute maximum ratings (1) 1. absolute maximum ratings are those values beyond which damage to the device may occur. these are stress ratings only and functional operation of the device at th ese conditions is not implied. exposur e to absolute-maximum-rated conditions for extended periods may affect device reliability. all volt age values are with respect to network ground terminal. symbol parameter value unit v cc-l , v cc dc power supply input voltage pins -0.3 to 16 v v up dc input voltage -0.3 to 24 v i out output current internally limited ma v orx dc output pin voltage -0.3 to 25 v v otx tone output pin voltage -0.3 to 25 v v i logic input voltage (ttx, sda, scl, dsqin, addr pins) -0.3 to 7 v v oh logic high output voltage (pdc pin) -0.3 to 7 v v extm extm pin voltage -0.3 to 2 v lx lx input voltage -0.3 to 24 v v byp internal reference pin voltage (2) 2. the byp pin is intended only to connect an external ceramic c apacitor. any connection of this pin to external current or voltage sources may cause permanent damage to the device. -0.3 to 4.6 v isel current selection pin voltage -0.3 to 4.6 v t stg storage temperature range -50 to 150 c t j operating junction temperature range -25 to 125 c esd esd rating with human body model (hbm) for all pins unless 4, 21, 22 2 kv esd rating with human body model (hbm) for pins 21, 22 4 esd rating with human body model (hbm) for pin 4 0.6 table 4. thermal data symbol parameter value unit r thjc thermal resistance junction-case 2 c/w r thja thermal resistance junction-ambient with device soldered on 2s2p pc board 35 c/w
lnbh23l typical application circuit doc id 15335 rev 4 11/25 5 typical application circuit figure 3. diseqc 1.x using internal 22 khz tone generator d3 l1 c6 470nf v in 12v to lnb 500ma max d2 { i 2 c bus sda scl pdc lx vup vcc-l vcc vorx extm addr c1 c8 220nf lnbh23l ttx p-gnd a-gnd d1 c10 220nf c4 470nf votx isel r2 (rsel) 15kohm byp c11 220nf dsqin c15 47nf r9 1.5kohm c3 tone enable control ttl d3 d3 l1 c6 470nf v in 12v to lnb 500ma max d2 d2 { i 2 c bus sda scl pdc lx vup vcc-l vcc vorx extm addr c1 c8 220nf c8 220nf lnbh23l ttx p-gnd a-gnd p-gnd a-gnd d1 d1 c10 220nf c10 220nf c4 470nf c4 470nf votx isel r2 (rsel) 15kohm r2 (rsel) 15kohm byp c11 220nf byp c11 220nf c11 220nf dsqin c15 47nf r9 1.5kohm r9 1.5kohm c3 c3 c3 tone enable control ttl tone enable control ttl figure 4. diseqc 1.x using internal 22 khz tone generator and "optional" pdc circuit d3 l1 c6 470nf v in 12v to lnb 500ma max d2 { i 2 c bus sda scl pdc lx vup vcc-l vcc vorx extm addr c1 c8 220nf lnbh23l ttx p-gnd a-gnd d1 c10 220nf c4 470nf votx isel r2 (rsel) 15kohm byp c11 220nf dsqin c15 47nf r9 1.5kohm c3 tone enable control ttl diode 1n4148 *r7 22 ohm *c14 1nf (*) optional components. to be used only in case of heavy capacitive load *r5 2.2k ohm 3.3v *tr1 *r8 150 ohm d3 d3 l1 c6 470nf v in 12v to lnb 500ma max d2 d2 { i 2 c bus sda scl pdc lx vup vcc-l vcc vorx extm addr c1 c8 220nf c8 220nf lnbh23l ttx p-gnd a-gnd p-gnd a-gnd d1 d1 c10 220nf c10 220nf c4 470nf c4 470nf votx isel r2 (rsel) 15kohm r2 (rsel) 15kohm byp c11 220nf byp c11 220nf c11 220nf dsqin c15 47nf r9 1.5kohm r9 1.5kohm c3 c3 c3 tone enable control ttl tone enable control ttl diode 1n4148 *r7 22 ohm *c14 1nf (*) optional components. to be used only in case of heavy capacitive load *r5 2.2k ohm 3.3v *tr1 *r8 150 ohm
typical application circuit lnbh23l 12/25 doc id 15335 rev 4 figure 5. diseqc 1.x using external 22 khz tone generator source through extm pin l1 c6 470nf d3 v in 12v to lnb 500ma max d2 lx vup vorx c1 lnbh23l p - gnd a - gnd d1 c10 220nf c4 470nf votx i 2 c bus scl extm addr ttx c15 220nf 22khz signal source { sda pdc isel byp c11 220nf dsqin c3 vcc -l vcc c8 220nf l1 c6 d3 d3 v in 12v to lnb 500ma max d2 d2 c1 lnbh23l d1 d1 c10 220nf c10 220nf c4 470nf c4 470nf i 2 c15 220nf c15 220nf 22khz signal source { pdc isel c11 220nf dsqin pdc isel r2 (rsel) 15kohm dsqin l1 c6 470nf d3 v in 12v to lnb 500ma max d2 lx vup vorx c1 lnbh23l p - gnd a - gnd d1 c10 220nf c4 470nf votx i 2 c bus scl extm addr ttx c15 220nf 22khz signal source { sda pdc isel byp c11 220nf dsqin c3 vcc -l vcc c8 220nf l1 c6 d3 d3 v in 12v to lnb 500ma max d2 d2 c1 lnbh23l d1 d1 c10 220nf c10 220nf c4 470nf c4 470nf d1 d1 c10 220nf c10 220nf c4 470nf c4 470nf i 2 c15 220nf c15 220nf 22khz signal source { pdc isel c11 220nf dsqin pdc isel r2 (rsel) 15kohm dsqin table 5. bom list component notes r2, r9, r5 (1) 1/16 w resistors. refer to the typical app lication circuit for the relative values r7 (1) , r8 (1) 1/2 w resistors. refer to the typical application circuit for the relative values c1 25 v electrolytic capacitor, 10 0 f or higher is suitable c3 25 v, 220 f electrolytic capacitor, esr in the 100 m to 350 m range c4, c6, c8, c10, c11, c15, c14 (1) 25 v ceramic capacitors. refer to the typ. appl. circuit for the relative values d1 stps130a or any similar schottky diode with v rrm > 25 v and i f(av) higher than: i f(av) > i out_max x (v up_max /v in_min ) d2 bat43, 1n5818, or any schottky diode with i f(av) > 0.2 a, v rrm > 25 v, v f < 0.5 v. to be placed as close as possible to v orx pin d3 1n4001-07 or any similar general purpose rectifier tr1 (1) bc817 or similar npn general-purpose transistor. l1 22 h inductor with i sat > i peak where i peak is the boost converter peak current (see equation 1 ) 1. these components can be added to avoid any 22 khz tone di stortion due to heavy capacitive output loads. if not needed they can be removed leav ing the pdc pin floating.
lnbh23l typical application circuit doc id 15335 rev 4 13/25 to calculate the boost converter peak current (i peak ) of l1, use the following formula: equation 1
i2c bus interface lnbh23l 14/25 doc id 15335 rev 4 6 i2c bus interface data transmission from main microprocessor to the lnbh23l and vice versa takes place through the 2 wires i2c bus interface, consisting of the 2 lines sda and scl (pull-up resistors to positive supply voltage must be externally connected). 6.1 data validity as shown in figure 6 , the data on the sda line must be stable during the high semi-period of the clock. the high and low state of the data line can only change when the clock signal on the scl line is low. 6.2 start and stop condition as shown in figure 7 a start condition is a high to low transition of the sda line while scl is high. the stop condition is a low to high transition of the sda line while scl is high. a stop condition must be sent before each start condition. 6.3 byte format every byte transferred to the sda line must contain 8 bits. each byte must be followed by an acknowledge bit. the msb is transferred first. 6.4 acknowledge the master (microprocessor) puts a resistive high level on the sda line during the acknowledge clock pulse (see figure 8 ). the peripheral (lnbh23l) that acknowledges has to pull-down (low) the sda line during the acknowledge clock pulse, so that the sda line is stable low during this clock pulse. the peripheral which has been addressed has to generate acknowledge after the reception of each byte, otherwise the sda line remains at the high level during the ninth clock pulse time. in this case the master transmitter can generate the stop information in order to abort the transfer. the lnbh23l won't generate acknowledge if the v cc supply is below the under voltage lockout threshold (6.7 v typ.). 6.5 transmission without acknowledge avoiding to detect the acknowledges of the lnbh23l, the microprocessor can use a simpler transmission: simply it waits one clock cycle without checking the slave acknowledging, and sends the new data. this approach of course is less protected from misworking and decreases the noise immunity.
lnbh23l i2c bus interface doc id 15335 rev 4 15/25 figure 6. data validity on the i2c bus figure 7. timing diagram of i2c bus figure 8. acknowledge on the i2c bus
lnbh23l software description lnbh23l 16/25 doc id 15335 rev 4 7 lnbh23l software description 7.1 interface protocol the interface protocol comprises: a start condition (s) a chip address byte (the lsb bit determines read (=1)/write (=0) transmission) a sequence of data (1 byte + acknowledge) a stop condition (p) ack = acknowledge s = start p = stop r/w = 1/0, read/write bit x = 0/1, two addresses selectable by addr pin (see ta bl e 1 0 ) 7.2 system register (sr, 1 byte) write = control bits functions in write mode read= diagnostic bits in read mode. all bits reset to 0 at power-on 7.3 transmitted data (i2c bus write mode) when the r/w bit in the chip address is set to 0, the main microprocessor can write on the system register (sr) of the lnbh23l via i2c bus. 6 bits are available and can be written by the microprocessor to control the device functions as per the below truth table ta b l e 6 . section address (a or b) data msb lsb msb lsb s 0 0 0 1 0 1 x r/w ack ack p mode msb lsb write pcl ttx ten llc vsel en test4 test5 read test1 test2 test3 llc vsel en otf olf
lnbh23l lnbh23l software description doc id 15335 rev 4 17/25 x = don't care all values are typical un less otherwise specified valid with ttx pin floating 7.4 diagnostic received data (i2c read mode) lnbh23l can provide to the mcu master a copy of the diagnostic system register information via i2c bus in read mode. the read mode is master activated by sending the chip address with r/w bit set to 1. at the following master generated clocks bits, lnbh23l issues a byte on the sda data bus line (msb transmitted first). at the ninth clock bit the master can: acknowledge the reception, starting in this way the transmission of another byte from the lnbh23l no acknowledge, stopping th e read mode communication three bits of the register are read back as a copy of the corresponding write output voltage register status (llc, vsel, en), two bits co nvey diagnostic inform ation about the over- temperature (otf), output over-load (olf) and three bit are for internal usage (test1-2-3) and must be disregarded by the mcu software. in normal operation the diagnostic bits are set to zero, while, if a failure is occurring, the corresponding bit is set to one. at start-up all the bits are reset to zero. table 6. truth table pcl ttx ten llc vsel en test4 test5 function 000100v orx = 13.4 v, v up = 14.5 v, (v up - v orx = 1.1 v) 001100v orx = 18.4 v, v up = 19.5 v, (v up - v orx = 1.1 v) 010100v orx = 14.4 v, v up =15.5 v, (v up -v orx =1.1 v) 011100v orx = 19.5v, v up =20.6 v, (v up -v orx =1.1 v) 00 10 0 internal 22 khz generator disabled, extm modulation enabled 10 10 0 internal 22 khz controlled by dsqin pin (only if ttx=1) 1 1 1 0 0 internal 22 khz tone output is always activated 0100 v orx output is on, v otx tone generator output is off 1100 v orx output is on, v otx tone generator output is on 0 x 1 0 0 pulsed (dynamic) current limiting is selected 1 x 1 0 0 static current limiting is selected x x x x x 0 0 0 power block disabled
lnbh23l software description lnbh23l 18/25 doc id 15335 rev 4 values are typical unless otherwise specified. x = don?t care. 7.5 power-on i2c interface reset i2c interface built in lnbh23l is automatica lly reset at power-on. as long as the v cc stays below the under voltage lockout (uvl) threshold (6.7 v), the interface does not respond to any i2c command and the system register (sr) is initialized to all zeroes, thus keeping the power blocks disabled. once the v cc rises above 7.3 v typ. the i2c interface becomes operative and the sr can be configured by the main microprocessor. this is due to 500 mv of hysteresis provided in the uvl threshold to avoid false retriggering of the power-on reset circuit. 7.6 address pin it is possible to select two i2c interface addre sses by means of addr pin. this pin is ttl compatible and can be set as per address pin characteristics ta bl e 1 0 . 7.7 diseqc? implementation lnbh23l helps system designer to implement diseqc 1.x protocol by allowing an easy pwk modulation of the 22 khz carrier through the extm and v otx pins. full compliance of the system to the specification is thus not implied by the bare use of the lnbh23l (see figure 3 , figure 4 and figure 5 ). table 7. register test1 test2 test3 llc vsel en otf olf function these bits are read exactly the same as they were left after last write operation 0t j < 135c, normal operation 1t j > 150c, power blocks disabled 0i o < i omax , normal operation 1i o > i omax , overload protection triggered xx x these bits status must be disregarded by the mcu.
lnbh23l electrical characteristics doc id 15335 rev 4 19/25 8 electrical characteristics refer to the typical application circuits, t j from 0 to 85 c, en=1, vsel=llc=ten=pcl=test4=test5=ttx=0, r sel =15 k , dsqin=low, v in =12 v, i out = 50 ma, unless otherwise stated. typical values are referred to t j = 25 c. v out = v orx pin voltage. see software description section for i2c access to the system register. table 8. electrical characteristics symbol parameter test conditions min. typ. max. unit v in supply voltage i out =500ma, vsel=llc=1 8 12 15 v i in supply current i out =0 7 15 ma en=ten=ttx=1, i out =0, pdc circuit not connected 20 40 en=0 2 v out output voltage vsel=1 i out =500ma llc=0 17.8 18.4 19.2 v llc=1 19.5 v out output voltage vsel=0 i out =500ma llc=0 12.8 13.4 14 llc=1 14.4 v out line regulation v in =8 to 15v vsel=0 5 40 mv vsel=1 5 60 v out load regulation vsel=0 or 1 i out from 50 to 500ma 200 i max output current limiting thresholds rsel=15 k 500 800 ma rsel= 22 k 300 600 i sc output short circuit curre nt vsel=0/1, aux=0/1 1000 ma t off dynamic overload protection off time pcl=0, output shorted 900 ms t on dynamic overload protection on time pcl=0, output shorted t off /10 f tone tone frequency dsqin=high or ten=1, ttx=1 (using internal tone generator) 18 22 26 khz a tone tone amplitude dsqin=high or ten=1, ttx=1, diseqc 1.x configuration using internal generator, i out from 0 to 500ma, c out from 0 to 750nf, pdc optional circuit connected to v orx rail 0.4 0.650 0.9 v pp d tone tone duty cycle dsqin=high or ten=1, ttx=1 (using internal tone generator) 40 50 60 % t r , t f tone rise or fall time dsqin=high or ten=1, ttx=1 (using internal tone generator) 5815s v pdc_ol pdc pin logic low i pdc =2ma 0.3 v i pdc_oz pdc pin leakage current v pdc =5v 1 a g extm external modulation gain v out / v extm , freq. from 10 khz to 50 khz 1.8
electrical characteristics lnbh23l 20/25 doc id 15335 rev 4 symbol parameter test conditions min. typ. max. unit v extm external modulation input voltage extm ac coupling (1) 400 mv pp z extm external modulation impedance 2.0 k eff dc-dc dc-dc converter efficiency i out =500ma 93 % f sw dc-dc converter switching frequency 220 khz v il dsqin,ttx, pin logic low 0.8 v v ih dsqin,ttx, pin logic high 2 v i ih dsqin,ttx, pin input current v ih =5v 15 a i obk output backward current en=0, v obk =21v -6 -15 ma t shdn thermal shut-down threshold 150 c t shdn thermal shut-down hysteresis 15 c 1. external signal maximum voltage fo r which the extm function is guaranteed. table 8. electrical characteristics (continued) table 9. i2c electrical characteristics (1) symbol parameter test conditions min. typ. max. unit v il low level input voltage sda, scl 0.8 v v ih high level input voltage sda, scl 2 v i i input current sda, scl, v i = 0.4 to 4.5v -10 10 a v ol low level output voltage sda (open drain), i ol = 6ma 0.6 v f max maximum clock frequency scl 400 khz 1. t j from 0 to 85 c, v i = 12 v. table 10. address pins characteristics (1) symbol parameter test condition min. typ. max. unit v addr-1 "0001010(r/w)" address pin voltage range r/w bit determines the transmission mode: read (r/w=1) write (r/w=0) 00.8v v addr-2 "0001011(rw)" address pin voltage range r/w bit determines the transmission mode: read (r/w=1) write (r/w=0) 25v v addr-3 (2) "0001000(rw)" address pin voltage range r/w bit determines the transmission mode: read (r/w=1) write (r/w=0) 05v 1. t j from 0 to 85 c, v i = 12 v 2. this i2c address is reserved only for in ternal usage. do not use this address wi th other i2c peripher als to avoid address conflicts.
lnbh23l package mechanical data doc id 15335 rev 4 21/25 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: www.st.com . ecopack ? is an st trademark.
package mechanical data lnbh23l 22/25 doc id 15335 rev 4 table 11. qfn32 (5 x 5 mm) mechanical data dim. (mm.) min. typ. max. a 0.80 0.90 1.00 a1 0 0.02 0.05 a3 0.20 b 0.18 0.25 0.30 d 4.85 5.00 5.15 d2 3.20 3.70 e 4.85 5.00 5.15 e2 3.20 3.70 e0.50 l 0.30 0.40 0.50 ddd 0.08 figure 9. qfn32 package dimensions 7376875/e
lnbh23l package mechanical data doc id 15335 rev 4 23/25 dim. mm. inch. min. typ. max. min. typ. max. a 33 0 12. 99 2 c 12. 8 1 3 .2 0.504 0.51 9 d 20.2 0.7 9 5 n 99 101 3 . 898 3 . 9 76 t 14.4 0.567 ao 5.25 0.207 bo 5.25 0.207 ko 1.1 0.04 3 po 4 0.157 p 8 0. 3 15 tape & reel qfnxx/dfnxx (5x5 mm.) mechanical data
revision history lnbh23l 24/25 doc id 15335 rev 4 10 revision history table 12. document revision history date revision changes 27-jan-2009 1 initial release. 18-may-2009 2 modified: figure 3 on page 11 , figure 4 on page 11 and figure 5 on page 12 . added: z extm table 8 on page 19 . 09-sep-2009 3 modified: i in , a tone condition table 8 on page 19 and figure 5 on page 12 . 29-nov-2010 4 modified table 10 on page 20 .
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