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| 型号： | A8292SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 13/20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
Table 3. Control Registers with Address (I1, I0) = 10 and 11
Name
Channel 1
Channel 2
Bit
0
1
2
3
4
5
(Address: I1, I0 = 10)
TMODE1
TGATE1
CADT1
–
–
–
(Address: I1, I0 = 11)
TMODE2
TGATE2
CADT2
–
–
–
Setting
0: External Tone
1: Internal Tone
0: Tone Gated Off
1: Tone Gated On
0: Cable Disconnect Test Off
1: Cable Disconnect Test On
Not Used
Not Used
Not Used
Address Bit
6
I0
I0
Channel 1: 0
Channel 2: 1
Address Bit
7
I1
I1
Channel 1: 1
Channel 2: 1
Bit 0
Bit 1
TMODE x ToneMode. Selects between the use of an external 22 kHz logic signal or the use
of the internal 22 kHz oscillator to control the tone generation on the LNB x output.
A 0 selects the external tone and a 1 selects the internal tone. See the Tone Genera-
tion section for more information
TGATE x Tone Gate. Allows either the internal or external 22 kHz tone signals to be gated,
unless the EXTM x is selected for gating. When set to 0, the selected tone (via
TMODE x ) is off. When set to 1, the selected tone is on. See Tone Generation Sec-
tion for more information.
Bit 2
CADT x
Cable Disconnect Test. To perform this test, set bits CADT, ENB, and VSEL0
through VSEL3 through the I 2 C-compatible interface. During this test, the LNB
linear regulator is disabled, a 1 mA current source between the BOOST output and
the LNB output is enabled, and the BOOST voltage is increased to 22.8 V. After
these conditions are set, if the LNB voltage is above 21 V, it is assumed that the
coaxial cable connection between the LNBR output and the LNB head has been
disconnected. In this case, the CAD bit is set in the Status register. If there is a load
on the LNB pin, then the LNB voltage will decrease proportionally to the load
current. If the LNB volts drop below 19.95 V, it is assumed that the coaxial cable is
connected and the CAD bit in the Status register is set to 0.
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
– Not Used.
– Not Used.
– Not Used.
I0 Address.
I1 Address.
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
13
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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