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| 型号： | A8292SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LNB SUPPLY/CONTROL 28-MLP |
| 标准包装： | 1 |
| 应用： | 转换器，模拟和数字式卫星信号接收器 |
| 输入电压： | 8 V ~ 16 V |
| 输出数： | 2 |
| 输出电压： | 12.7 V ~ 20.4 V |
| 工作温度： | -20°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN/MLP 裸露焊盘（5x5） |
| 包装： | 标准包装 |
| 产品目录页面： | 1141 (CN2011-ZH PDF) |
| 其它名称： | 620-1187-6 |
A8292
Dual LNB Supply and Control Voltage Regulator
Tone Generation
The A8292 solution offers four options for tone generation,
providing maximum flexibility to cover every application. The
EXTM pins (external modulation), in conjunction with the I 2 C?
control bits: TMODE (tone modulation) and TGATE (tone gate),
provide the necessary control. The TMODE bit controls whether
the tone source is either internal or external (via the EXTM pin).
Both the EXTM pin and TGATE bit determine the 22 kHz con-
EXTM
TMODE
TGATE
Tone
trol, whether gated or clocked.
(LNB Ref)
LNB (V)
Four options for tone generation are shown in figure 2. Note
that when using option 4, when EXTM stops clocking, the LNB
volts park at the LNB voltage, either plus or minus half the tone
signal amplitude, depending on the state of EXTM. For example,
if the EXTM is held low, the LNB DC voltage is the LNB pro-
grammed voltage minus 325 mV (typical).
With any of the four options, when a tone signal is generated,
TDET is set in the status register. When the internal tone is used
Option 1 – Use internal tone, gated by the TGATE bit.
EXTM
TMODE
TGATE
Tone
(options 1 or 2), the minimum tone detect amplitude is 400 mV,
(LNB Ref)
LNB (V)
and when an external tone is used (options 3 or 4), the minimum
tone detection amplitude is 300 mV.
I 2 C?-Compatible Interface
This is a serial interface that uses two bus lines, SCL and SDA,
Option 2 – Use internal tone, gated by the EXTM pin.
EXTM
TMODE
to access the internal Control and Status registers of the A8292.
Data is exchanged between a microcontroller (master) and the
A8292 (slave). The clock input to SCL is generated by the master,
while SDA functions as either an input or an open drain output,
TGATE
Tone
(LNB Ref)
LNB (V)
depending on the direction of the data.
Timing Considerations
The control sequence of the communication through the I 2 C?-
compatible interface is composed of several steps in sequence:
1. Start Condition. Defined by a negative edge on the SDA line,
Option 3 – Use external tone, gated by the TGATE bit.
EXTM
TMODE
TGATE
while SCL is high.
2. Address Cycle. 7 bits of address, plus 1 bit to indicate read (1)
or write (0), and an acknowledge bit. The first five bits of the
address are fixed as: 00010. The four optional addresses, de-
fined by the remaining two bits, are selected by the ADD input.
The address is transmitted MSB first.
Tone
(LNB Ref)
Option 4 – Use external tone.
Figure 2. Options for tone generation
LNB (V)
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
9
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