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參數(shù)資料
| 型號(hào)： | LNBH221PD |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.75 A DUAL SWITCHING CONTROLLER, PDSO36 |
| 封裝： | POWER, SO-36 |
| 文件頁數(shù)： | 7/29頁 |
| 文件大?。?/td> | 800K |
| 代理商： | LNBH221PD |
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LD39150
LNBH221 software description (same for both section)
15/27
6.5
Power-On I2C interface reset
The I2C interface built in the LNBH221 is automatically reset at power-on. As long as the
VCC stays below the UnderVoltage Lockout threshold (6.7V typ.), the interface will not
respond to any I2C command and the System Register (SR) is initialized to all zeroes, thus
keeping the power blocks disabled. Once the VCC rises above 7.3V typ, the I
2C interface
becomes operative and the SR can be configured by the main P. This is due to 500mV of
hysteresis provided in the UVL threshold to avoid false retriggering of the Power-On reset
circuit.
6.6
Address Pin
Connecting this pin to GND the Chip I2C interface address is 0001000, but, it is possible to
choice among 4 different addresses simply setting this pin at 4 fixed voltage levels (see
Table 7. on page 17).
6.7
DiSEqCTM Implementation
The LNBH221 helps the system designer to implement the bi-directional DiSEqC 2.0
protocol by allowing an easy PWK modulation/demodulation of the 22KHz carrier. The PWK
data are exchanged between the LNBH221 and the main P using logic levels that are
compatible with both 3.3 and 5V microcontrollers. This data exchange is made through two
dedicated pins, DSQIN and DSQOUT, in order to maintain the timing relationships between
the PWK data and the PWK modulation as accurate as possible. These two pins should be
directly connected to two I/O pins of the P, thus leaving to the resident firmware the task of
encoding and decoding the 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
LNBH221. The system designer should also take in consideration the bus hardware
requirements; that can be simply accomplished by the R-L termination connected on the
VOUT pins of the LNBH221, as shown in the Typical Application Circuit on page 7, 8. To
avoid any losses due to the R-L impedance during the tone transmission, the LNBH221 has
dedicated output (VOTX) that, in a DiSEqC 2.0 application, is connected after the filter and
must be enabled by setting the TTX SR bit HIGH only during the tone transmission (see
DiSEqC 2.O operation description on page 9).
Unidirectional (1.x) DiSEqC and non-DiSEqC systems normally don't need this termination,
and the VOTX pin can be directly connected to the LNB supply port of the Tuner (see
DiSeqC 1.x application circuit on pag. 7, 8). There is also no need of Tone Decoding, thus
DETIN and DSQOUT pins can be left unconnected and the Tone is provided by the VOTX.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LNBH221PD-TR | 功能描述:其他電源管理 LNB Supply/Control RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| LNBH23 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LNBs supply and control IC with step-up and IC interface |
| LNBH23LQTR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 LNB SUPP/CNTRL IC WITH STEP UP RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LNBH23PPR | 功能描述:其他電源管理 LNB supply and control IC RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
| LNBH23PPR-CUT TAPE | 制造商:ST 功能描述:LNBH23 Series 15 V 1 A LNB Supply Step-Up I? Interface Controller - PowerSSO-24 |
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