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參數(shù)資料
| 型號： | AMIS-49200 |
| 英文描述： | Fieldbus MAU Chip |
| 中文描述： | 現(xiàn)場總線MAU芯片 |
| 文件頁數(shù)： | 12/22頁 |
| 文件大?。?/td> | 492K |
| 代理商： | AMIS-49200 |
AMIS-49200 Fieldbus MAU
Data Sheet
4.0 Theory of Operation
4.1 Overview
AMIS-49200 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. AMIS-49200 Fieldbus can also monitor these power supply voltages and generate power-fail signals if they fall below a
specified value.
AMIS-49200 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.
AMIS-49200 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 V
CC
(typ. = 5V) used by the analog circuitry
2. A series regulator - for establishing a supply voltage of V
DD
(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 V
REF
. The V
CC
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 V
CC
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
μ
F or larger capacity is necessary to stabilize this
regulator.
It is possible to increase the V
CC
voltage up to 6.2V by dividing V
CC
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:
V
CC
= V
REF
×
(1 + R
1
/ R
2
)
Shunt Regulator
(
Internal Configuration
)
VCC
Rsh
3
.
25
Rsh
25
mA
(
Max
)
VCC
18
SHUNT
8
SGND
SHSETIN
SHSET
9
6
7
A
6
System
Rsh
3.25Rsh
25
mA
(
Max
)
VCC
18
SHUNT
8
SGND
SHSETIN
SHSET
Shunt Regulator
(External Configuration
)
9
6
7
A6
System
VCC
R2
R1
N/C
VREF
VREF
Cfb
50
pF
16
Meg
Cfb
50
pF
16Meg
Figure 4: Shunt Regulator
12
AMI Semiconductor
– Jan. 07, M-20532-003
www.amis.com
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|---|---|
| AMIS-49200-XTD | 功能描述:總線收發(fā)器 FIELDBUS MAU PHY TRNSCVR RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| AMIS-49200-XTP | 功能描述:總線收發(fā)器 FIELDBUS MAU PHY TRNSCVR RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| AMIS-49250-XTD | 功能描述:總線收發(fā)器 Field Bus MAU Transceiver RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| AMIS-49250-XTP | 功能描述:總線收發(fā)器 AMIS-49250 FIELDBUS MAU T RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| AMIS-492X0 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Fieldbus MAU |
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