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PDF AMIS-49200 Data sheet ( Hoja de datos )
| Número de pieza | AMIS-49200 | |
| Descripción | Fieldbus MAU | |
| Fabricantes | ON Semiconductor | |
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AMIS-492x0
AMIS-492x0 Fieldbus MAU
Overview
AMIS−492x0 Fieldbus MAU (Media Access Unit) is a transceiver
chip for low speed FOUNDATION® Fieldbus and Profibus PA
devices. The AMIS−49200 was originally designed to be a near
pin-for-pin replacement of the Yokogawa mSAA22Q MAU. “Near
pin-for-pin” means that associated component values may change, but
no board changes are required. A micro-leadframe package option
(NQFP) is also available, the AMIS−49250.
Features
AMIS−492x0 Fieldbus MAU is a transceiver IC for low speed
FOUNDATION Fieldbus and Profibus PA devices. It incorporates the
following features:
• All Node Power can be Supplied by the Bus, via the AMIS-492x0
• Current Consumption 500 mA (Typ)
• VCC Voltage: 6.2 V to 4.75 V
• VDD Voltage: 5.5 V to 2.7 V
• Compatible to IEC 1158−2 and ISA 50.02
• Shunt Regulator
• Voltage Reference (Internal Only)
• Series Regulator
• Band-pass Filter
• Slew Rate Control
• Segment Current Control
• Low Voltage Detection
• Carrier Detect
• Data Rate: 31.25 kbps Voltage Mode
• Dual Voltage Supply 3−6.2 V
• 44-pin LQFP/NQFP Package
• These Devices are Pb−Free and are RoHS Compliant
Applications
• Process Automation
• Pressure and Temperature Monitoring
Definitions, Acronyms and Abbreviations
IC − Integrated Circuit
ESD − Electrostatic Discharge
FF − FOUNDATION Fieldbus
LQFP
− Low Profile Quad Flat Pack
Manchester − Communications Encoding Scheme Implemented in
FOUNDATION Fieldbus
MAU
− Medium Attachment Unit
MDS
− Medium Dependent Sub-layer
NQFP
− “Near Chip-scale” Quad Flat Pack
mSAA22Q − Name of Yokogawa’s MAU IC
www.onsemi.com
LQFP−44, 10x10
CASE 561AA
NQFP 44, 7x7
CASE 560BD
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.
© Semiconductor Components Industries, LLC, 2016
August, 2016 − Rev. 8
1
Publication Order Number:
AMIS−492x0/D
1 page  
AMIS−492x0
Power Supply Blocks
Table 5. REGULATOR SPECIFICATIONS
Parameter
Symbol
Conditions
Shunt Regulator
Output Voltage
VCC Preset, ISH = 1 to 5 mA
External Setting
Sink Current
Load Capacitance
Load Regulation
Temperature Coefficient
Series Regulator
ISH
CSH
TCVcc
Internal Pass Transistor N-ch and Pad
ISH = 1 to 25 mA
No Load Capacitance
Input Voltage
Output Voltage
VCC Internally Tied to VCC Pin
VO Preset, ISR = 0
External Setting and N-JFET
Output Current
ISR Internal Pass Transistor P-ch and Pad
Load Capacitance
CSR For Stability use CAP w/ESR
Load Regulation
ISR = 0 to 20 mA
Temperature Coefficient
TCVo
Low Voltage Detectors (Applies to N_PFail1 and PFail2)
Threshold
Hysteresis
VTH9
VHYS5
SxSETIN > VTH9 (Output: L → H)
SxSETIN < (VTH9 − VHYS5)
(Output: H → L)
Output Sink Current
Output Leakage Current
IOL VOL = 0.4 V (Open Drain)
IL VOH = 5 V
Min
4.85
4.75
0.001
5
0
−
4.75
2.91
2.85
−
5
0
−
85
0.012
30
−
Typ
5.0
−
−
−
1.6
−
−
3.0
−
−
−
2
±200
90
0.025
−
−
Max Unit
5.15
6.2
25
−
4
±200
V
V
mA
mF
%
ppm/°C
6.2 V
3.09 V
3.5 V
20 mA
− mF
4%
− ppm/°C
95
0.038
% Vref
V
135 mA
1 mA
Table 6. VOLTAGE REFERENCE SPECIFICATIONS
Parameter
Symbol
Conditions
Min Typ
Bandgap Voltage Reference
Output Voltage Tolerance
Temperature Drift
VREF
Equates to: ±2%
1.157
−
1.185
50
Hysteresis
VREFHYS (Note 2)
− 100
Supply Voltage
VCCREF
4.75 5
Load Current
IREFOUT No Load During Operation
−−
VMID Voltage Reference
Output Voltage
VMID
1.95 2.0
Output Current
IMID
−30 −
Load Capacitance
CMID
DVC6000F Uses 1 mF
0.01 0.1
Temperature Coefficient
TCMID
−−
2. Hysteresis is defined as the change in the 25°C reading after 85°C to 25°C cycle and –40°C to 25°C cycle.
Max Unit
1.205
−
−
6.2
0
V
ppm/°C
mV
V
mA
2.05
100
1
±200
V
mA
mF
ppm/°C
www.onsemi.com
5
5 Page 
AMIS−492x0
Tri-level Modulator
The tri-level modulator switches current signals into a
summing node. The slew rate controller converts the current
to a voltage signal, VDRV. The DC level of silence (VS) is
nominally 2.5 V. Transmission high (VH) is nominally 2.9 V
and transmission low (VL) is nominally 2.1 V, yielding an
amplitude of 0.8 V.
N_VL
N_Vs
Tri-level Modulator & Slew Control
Active Low
Active Low
4R
80 kW
4R
80 kW
20R
400 kW
VMID
R
20 kW
VCC
−
A3
+
Figure 7. Tri-level Modulator
VDRV
1.2 kW
21
1.2 kW
CRT
19
1.2 kW
Slew Rate Controller
Amplifier (A3), shown in the above figure, controls the
slew rate. The amplifier converts the current signals from the
tri-level modulator to a voltage signal, VDRV. It controls its
slew rate with a capacitor (CRT) connected to the CRT pin.
The waveform at the VDRV pin is symmetric and the
fall/rise times are determined by the following equation:
tF, tR + 2.0[ms] ) 0.12[msńpF] CRT
(eq. 3)
The constant part comes from the internal capacitor (not
shown). It is recommended to make a guard pattern on your
circuit board around the CRT pin and the hot side of CRT to
avoid unnecessary interference.
Current Drive Amplifier
The drive amplifier is an operational amplifier optimized
to drive current drivers for 31.25 kbps voltage-mode
medium. Its input and output signals are exposed to allow
flexible design of the external driver. Note that this amplifier
cannot directly sink the necessary current from the medium.
In the following drive circuit the current (IBUS) through the
current-detect resister (RF) is determined by the following
equation.
Ibus
+
ƪR3Vmid
ǒR12 ) R11Ǔƫ * ƪVDRV ǒR2R11
* ƪRF ǒR2R12 ) R3R12Ǔƫ
)
R3R11Ǔƫ
(eq. 4)
A diode and/or a resistor connected to the emitter are
necessary to shift the DC level of CCOUT and to suppress
the loop gain. The resistance value depends on your design
(overall gain and emitter current).
Vmid VDRV
R2 R12
CCINP
23
24
CCINM
R3 R11
VCC
+
A4
−
CCOUT
25
Bus
Rf
Figure 8. Current Control Circuit
Receive Block
The receive block contains three sub-blocks, which are
internally connected:
1. A Band Pass Filter – to filter the desired incoming
communication signal.
2. Carrier Detector – generates the RxA signal by
detecting the signal amplitude.
3. Zero-cross Detector generates the RxS signal by
detecting the high/low transitions of the
Manchester code.
Band Pass Filter
The band pass filter is a series connection of a high-pass
and a low-pass filters each having two poles. Each filter is
comprised of a voltage follower and on chip resisters, so
only four external capacitors are necessary. The following
figure shows an internal circuit and the connection of
external capacitors. Cut-off frequency, fL, of the high-pass
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| PDF Descargar | [ Datasheet AMIS-49200.PDF ] | |
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