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| 型号： | A8291SETTR-T |
| 厂商： | Allegro Microsystems Inc |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC VOLTAGE REG SGL LNB 28-QFN |
| 标准包装： | 9,000 |
| 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： | 1 |
| 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： | 带卷 (TR) |
A8291
Single LNB Supply and Control Voltage Regulator
Table 6. Status Register 1
Bit
0
1
2
3
4
5
6
7
Name
DIS
–
OCP
–
PNG
–
TSD
VUV
Function
LNB output disabled
Not Used
Overcurrent
Not Used
Power Not Good
Not Used
Thermal Shutdown
V IN Undervoltage
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
DIS
–
OCP
–
PNG
–
TSD
VUV
LNB Output Disabled. DIS is used to indicate the current condition of the LNB
output. At power-on, or if a fault condition occurs, DIS will be set. This bit changing
to 1 does not cause the IRQ to activate because the LNB output may be disabled in-
tentionally by the I 2 C? master. This bit will be reset at the end of a write sequence
if the LNB output is enabled.
Not used.
Overcurrent. If the LNB output detects an overcurrent condition, for greater than
48 ms, the LNB output will be disabled. The OCP bit will be set to indicate that an
overcurrent has occurred and the disable bit, DIS, will be set. The Status register is
updated on the rising edge of the 9 th clock pulse in the data read sequence, where the
OCP bit is reset in all cases, allowing the master to reenable the LNB output.
If the overcurrent timer is not enabled, the device operate in current limit indefinitely
and the OCP bit will be set. If the overcurrent condition is removed, the OCP bit will
automatically be reset. Note that if the overcurrent operates long enough, and a ther-
mal shutdown occurs, the LNB output will be disabled and the TSD bit will be set.
Not used.
Power Not Good. Set to 1 when the LNB voltage is below 85% of the programmed
voltage. The PNG bit is reset when the LNB voltage is within 90% of the pro-
grammed LNB voltage. PNG is always active so, if the LNB output is disabled, then
PNG will be a logic 1. At power-up, PNG reports a logic 1 until the LNB output is
enabled and within 90% of the programmed LNB voltage.
Not used.
Thermal shutdown. 1 indicates that the A8291 has detected an overtemperature
condition and has disabled the LNB output. The disable bit, DIS, will also be set.
The status of the overtemperature condition is sampled on the rising edge of the 9 th
clock pulse in the data read sequence. If the condition is no longer present, then the
TSD bit will be reset, allowing the master to reenable the LNB output if required. If
the condition is still present, then the TSD bit will remain at 1.
Undervoltage Lockout. 1 indicates that the A8291 has detected that the input sup-
ply, V IN is, or has been, below the minimum level and an undervoltage lockout has
occurred disabling the LNB outputs. The disable bit, DIS, will also be set and the
A8291 will not reenable the output until so instructed by writing the relevant bit into
the control registers. The status of the undervoltage condition is sampled on the rising
edge of the 9 th clock pulse in the data read sequence. If the condition is no longer
present, then the VUV bit will be reset allowing the master to reenable the LNB out-
put if required. If the condition is still present, then the VUV bit will remain at 1.
Allegro MicroSystems, LLC
115 Northeast Cutoff, Box 15036
15
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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相关代理商/技术参数 |
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|---|---|
| A8291SETTR-TB | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Single LNB Supply and Control Voltage Regulator |
| A8292 | 制造商:AMPEX 功能描述: |
| A8292SETTR-T | 功能描述:IC REG LNB SUPPLY/CONTROL 28-MLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| A8293 | 制造商:ALLEGRO 制造商全称:Allegro MicroSystems 功能描述:Single LNB Supply and Control Voltage Regulator |
| A8293SESTR-T | 功能描述:IC REG LNB BOOST/LINEAR 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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