参数资料
| 型号： | AMIS-49250-XTP |
| 厂商： | ON Semiconductor |
| 文件页数： | 3/22页 |
| 文件大小： | 0K |
| 描述： | IC TXRX FIELDBUS MAU 44NQFP |
| 标准包装： | 2,500 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | MDS-MAU |
| 电源电压： | 4.75 V ~ 6.2 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-VFQFN 裸露焊盘 |
| 供应商设备封装： | 44-NQFP（7x7） |
| 包装： | 带卷 (TR) |
AMIS-492x0
4.0 Theory of Operation
4.1 Overview
The AMIS-492x0 incorporates two different power supply circuits.
Both derive their power from the bus.
Using the internal
configuration, the shunt regulator is set for 5V and the series regulator is set for 3V. Users can modify either power supply by adding
external components. The AMIS-492x0 Fieldbus can also monitor these power supply voltages and generate power-fail signals if they
fall below a specified value. Please refer to the AMIS-492x0 Fieldbus MAU Reference Design Application Note for ways to adjust the
shunt and series voltage regulators.
The AMIS-492x0 Fieldbus MAU transmits a Manchester-encoded signal provided from a standard MDS-MAU interface. The output
driver makes it possible to design various signal circuits, which depend on the power requirements of your device. The slew rate of the
signal can be controlled to minimize unnecessary radiation as specified in IEC/ISA standards.
The AMIS-492x0 Fieldbus MAU has a built-in band pass filter which makes it easy to design your own receiver. The receive block
operates on a Manchester-encoded signal. It decodes the signal and verifies proper amplitude with a zero-cross and carrier detect
circuit, respectively. Detected signals are then passed on to a controller with the standard MDS-MAU interface.
4.2 Power Supply Block
The power supply block contains four sub-blocks:
1.
A shunt regulator - for establishing a supply voltage of VCC (typ. = 5V) used by the analog circuitry
2.
A series regulator - for establishing a supply voltage of VDD (typ. = 3V) used for digital circuitry
3.
Two low voltage detectors - for monitoring the two supply voltages
4.
A bandgap voltage reference - which is used internally for generating a bias level for AC signals
4.2.1. Shunt Regulator
The shunt regulator controls its sink current to the SHUNT pin so that the voltage applied to the SHSETIN pin is equal to VREF. The VCC
input is divided by an internal network to provide a voltage equal to Vref at the SHSET pin. If SHSET and SHSETIN pins are tied
together, and VCC and SHUNT pins are connected to a power source of high impedance (e.g., current mirror circuit of signal driver), the
shunt regulator provides 5V power to itself and external circuits. A capacitor of 5
μF or larger capacity is necessary to stabilize this
regulator. Figure 13 shows C10 (22
μF) connected to Pin 8 to accomplish stabilization.
It is possible to increase the VCC voltage up to 6.2V by dividing VCC with an external network to supply the appropriate voltage to
SHSETIN pin. In this case, SHSET pin must be kept open. The output voltage is determined by the following equation:
VCC = VREF × (1 + R1 / R2)
Rsh
3.25Rsh
25mA
(Max)
VCC
SHUNT
SGND
SHSETIN
SHSET
Shunt Regulator
(Internal Configuration)
9
6
7
18
8
A6
System
VCC
Rsh
3.25Rsh
25mA
(Max)
VCC
SHUNT
SGND
SHSETIN
SHSET
Shunt Regulator
(External Configuration)
9
6
7
18
8
A6
System
VCC
R2
R1
N/C
VREF
Cfb
50pF
16Meg
Cfb
50pF
16Meg
Figure 4: Shunt Regulator
Rev. 6 | Page 11 of 22 | www.onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AMIS-492X0 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Fieldbus MAU |
| AMIS492X0GEVB | 制造商:ON Semiconductor 功能描述:FIELDBUS EVAL BOARD - Bulk |
| AMIS-49587 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Power Line Carrier Modem |
| AMIS-49587_P2 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Power Line Carrier Modem |
| AMIS49587C5871G | 功能描述:电信线路管理 IC C587- NAF- AMIS49587 RoHS:否 制造商:STMicroelectronics 产品:PHY 接口类型:UART 电源电压-最大:18 V 电源电压-最小:8 V 电源电流:30 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VFQFPN-48 封装:Tray |
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