Features used designs presently using SYM20C15 Single-chip, half-
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A5191HRT AMIS HARTModem
Features
used designs presently using SYM20C15 Single-chip, half-duplex 1200 bits second modem Bell shift frequencies 1200Hz 2200Hz 3.3V 5.0V power supply Transmit-signal wave shaping Receive band-pass filter power: optimal intrinsically safe applications CMOS compatible Internal oscillator requires 460.8kHz crystal ceramic resonator Meets HART physical layer requirements Industrial temperature range -40°C +85°C Available 28-pin PLCC 32-pin LQFP packages
Description
A5191HRT single-chip, CMOS modem highway addressable remote transducer (HART) field instruments masters. modem external passive components provide functions needed satisfy HART physical layer requirements including modulation, demodulation, receive filtering, carrier detect, transmit-signal shaping. A5191HRT pin-compatible with SYM20C15. Description Functional Description sections details compatibility with SYM20C15. A5191HRT uses phase continuous frequency shift keying (FSK) 1200 bits second. conserve power receive circuits disabled during transmit operations vice versa. This provides half-duplex operation used HART communications.
Figure 28-Pin PLCC Pinout Diagrams (green non-green)
Figure 32-Pin LQFP Pinout Diagrams (green non-green)
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A5191HRT AMIS HARTModem
Table Pinout Summary 28-Pin PLCC, A5191HRTP/Pg (12197-504/508) Signal Name Type TEST1 TEST2 TEST3 TEST4 TEST5 INRESET TEST7 TEST8 TEST9 OTXA IAREF ICDREF OCBIAS TEST10 VDDA IRXA ORXAF IRXAC OXTL IXTL INRTS ITXD TEST11 ORXD TEST12 Input Input Input Input Input Input Output Input Input Description Connect connect connect connect Connect Reset digital logic when Connect Connect Connect Output transmit analog, modulated HART transmit signal 4-20mA loop interface circuit Analog reference voltage Carrier detect reference voltage IAREF ICDREF OCBIAS TEST10 VSSA VDDA IRXA ORXAF IRXAC OXTL IXTL VSSA INRTS ITXD TEST11 ORXD TEST12 TEST1 TEST2 TEST3 TEST4 Input Input TEST7 TEST8 TEST9 OTXA Input Input Input
Table Pinout Summary 32-Pin LQFP, A5191HRTL/Lg (12197-503/507) Signal Name TEST5 INRESET Type Input Input Description Connect Reset digital logic when low, connect normal operation Connect Connect Connect Output transmit analog, modulated HART transmit signal 4-20mA loop interface circuit Analog reference voltage Carrier detect reference voltage
Ground Digital ground Output
Output Comparator bias current Input Connect Ground Analog ground Power Analog supply voltage Input modulated HART receive signal from 4-20mA loop interface circuit Analog receive comparator input Crystal oscillator input
Output Comparator bias current Connect Input Power Input Analog supply voltage modulated HART receive signal from 4-20mA loop interface circuit Analog receive comparator input Crystal oscillator input Digital supply voltage Request sent Input transmit date, transmitted HART data stream from UART connect
Output Analog receive filter output Input Input Output Crystal oscillator output Ground Analog ground Ground Digital ground Power Digital supply voltage Input Input Request send Input transmit data, transmitted HART data stream from UART connect
Output Analog receive filter output Input Input Power Input Input Output Crystal oscillator output Ground Ground
Output Received demodulated HART data UART Output Carrier detect output connect
Output Received demodulated HART data UART Output Carrier detect output Input connect Connect connect connect connect
Power Digital supply voltage
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A5191HRT AMIS HARTModem
Descriptions
Table Descriptions Symbol IAREF Name Analog Reference Voltage
Description Analog input sets operating point operational amplifiers comparators usually selected split potential between VSS. IAREF Characteristics, Table Analog input controls which level carrier detect (OCD) becomes active. This determined voltage difference between ICDREF IAREF. Selecting ICDREF IAREF equal 0.08 will carrier detect nominal mVp-p When logic (VSS) this input holds digital logic reset. During normal operation INRESET should VDD. INRESET should held minimum 10nS after 2.5V shown Figure Active-low input selects operation modulator. OTXA enabled when this signal low. This signal must held high during power-up Input accepts 1200/2200Hz signals from external filter Positive input carrier detect comparator receiver filter comparator Input modulator accepts digital data form. When ITXD low, modulator output frequency 2200Hz. When ITXD high, modulator output frequency 1200Hz. Input internal oscillator must connected parallel mode 460.8kHz ceramic resonator when using internal oscillator grounded when using external 460.8kHz clock signal current through this output controls operating parameters internal operational amplifiers comparators. normal operation, OCBIAS current 2.54A. Output goes high when valid input recognized IRXA. received signal greater than threshold specified ICDREF four cycles IRXA signal, valid input recognized. Signal square wave output receiver high-pass filter Signal outputs digital receive data. When received signal (IRXA) 1200Hz, ORXD outputs logic high. When received signal (IRXA) 2200Hz, ORXD outputs logic low. ORXD qualified internally with OCD. Output provides trapezoidal signal controlled ITXD. When ITXD low, output frequency 2200Hz. When ITXD high, output frequency 1200Hz. This output active when INRTS when INRTS high. Output from internal oscillator must connected external 460.8kHz clock signal parallel mode 460.8kHz ceramic resonator when using internal oscillator Factory test pins; normal operation, these signals Table Table Power digital modem circuitry Power analog modem circuitry Analog digital ground
ICDREF
Carrier Detect Reference Voltage
INRESET INRTS IRXA IRXAC ITXD IXTL OCBIAS ORXAF ORXD OTXA OXTL
Reset Digital Logic Request Send Analog Receive Input Analog Receive Comparator Input Digital Transmit Input (CMOS) Oscillator Input Comparator Bias Current Carrier Detect Output Analog Receive Filter Output Digital Receive Output (CMOS) Analog Transmit Output Oscillator Output
TEST(12:1) Factory Test VDDA VSSA Digital Power Analog Supply Voltage Ground Analog Ground
Figure Reset Timing
Note: This signal also present 20C15. labeled Test6. 20C15 data sheet mentions reset function this does emphasize reset chip. Reliable operation modem requires hardware reset shown Figure This true AMIS 12197-503 12197-504 well 20C15.
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A5191HRT AMIS HARTModem
Functional Description
A5191HRT functional equivalent SYM20C15 HART Modem. contains transmit data modulator signal shaper, carrier detect circuitry, analog receiver demodulator circuitry oscillator, shown Figure internal HART modem modulates transmit-signal demodulates receive signal. transmit-signal shaper enables A5191HRT transmit HART compliant signal. carrier detected comparing receiver filter output with difference between external voltage references. analog receive circuitry band-pass filters received signal input modem carrier detect circuitry. oscillator provides modem with stable time base using either simple external resonator external clock source.
Figure A5191HRT Block Diagram
A5191HRT Logic modem consists modulator demodulator. modem uses shift frequencies nominally 1200Hz (for 220Hz (for rate 1200 bits/second.
4.1.1 Modulator
modulator accepts digital data form ITXD input generates modulated signal OTXA output. INRTS must logic modulator active.
4.1.2 Demodulator
demodulator accepts signal IRXA input reproduces original modulating signal ORXD output. nominal rate 1200 bits second. Figure illustrates demodulation process.
Figure Demodulator Signal Timing
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A5191HRT AMIS HARTModem
output demodulator qualified with carrier detect signal (OCD), therefore, only IRXA signals large enough detected (100mVp-p typically) carrier detect circuit produce received serial data ORXD. Maximum demodulator jitter percent given input frequencies within HART specifications, clock frequency 460.8kHz (±1.0 percent) zero input (IRXA) asymmetry.
Transmit-Signal Shaper transmit-signal shaper generates HART compliant modulated signal OTXA. Figure Figure show transmit-signal forms A5191HRT. IAREF 1.235 VDC, OTXA will have voltage swing from approximately 0.25 0.75 VDC.
Figure OTXA Waveform (1200Hz)
Figure OTXA Waveform (2200Hz)
Carrier Detect Circuitry carrier detect comparator shown Figure generates logic output IRXAC voltage below ICDREF. comparator output into carrier detect block (see Figure carrier detect block drives carrier detect output high INRTS high four consecutive pulses comparator have arrived. stays high long INRTS high next comparator pulse received less than 2.5ms. Once goes inactive, takes four consecutive pulses comparator assert again. Four consecutive pulses amount 3.33ms when received signal 1200Hz 1.82ms when received signal 2200HZ. Analog Receiver Circuitry
4.4.1 Voltage References
A5191HRT requires voltage references, IAREF ICDREF. IAREF sets operating point internal operational amplifiers comparators. 1.235 reference (Analog Devices AD589) suitable IAREF. level which (carrier detect) becomes active determined voltage difference (ICDREF IAREF). Selecting voltage difference 0.08 will carrier detect nominal mVp-p.
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A5191HRT AMIS HARTModem
4.4.2 Bias Current Resistor
A5191HRT requires bias current resistor connected between OCBIAS VSS. bias current controls operating parameters internal operational amplifiers comparators. value bias current resistor determined reference voltage IAREF following formula:
recommended bias current resistor 500KW when IAREF equal 1.235 VDC. Figure external capacitor values have tolerance percent resistors have tolerance percent, except which tolerance percent. External A5191HRT, filter exhibits three-pole, high-pass filter 624Hz one-pole, low-pass filter 2500Hz. Internally, A5191HRT high-pass pole 35Hz low-pass pole 90kHz. low-pass pole vary much percent. input impedance entire filter greater than 150MW frequencies below 50kHz.
Figure Receive Filter Schematic
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A5191HRT AMIS HARTModem
Oscillator
A5191HRT requires 460.8kHz clock signal OXTL. This provided external clock external components connected A5191HRT internal oscillator.
4.5.1 Internal Oscillator Option
oscillator cell will function with either 460.8kHz crystal ceramic resonator. parallel resonant ceramic resonator connected between OXTL IXTL. Figure illustrates crystal option clock generation using 460.8kHz percent tolerance) parallel resonant crystal tuning capacitors. actual values capacitors depend recommendations manufacturer resonator. Typically, capacitors range 100pF 470pF used.
4.5.2 External Clock Option
desirable external 460.8kHz clock shown Figure rather than internal oscillator because high cost availability ceramic resonators. addition, A5191HRT consumes less current when external clock used. Minimum current consumption occurs with clock connected OXTL IXTL connected VSS.
Figure Crystal Oscillator
Figure Oscillator with External Clock
Ordering Information
A5191HRT available 28-pin plastic leaded chip carrier (PLCC) 32-pin low-profile quad flat pack (LQFP). following part number when ordering. Contact your local sales representative more information: www.amis.com/sales.
Table Ordering Codes Package 32-pin LQFP 28-pin PLCC 32-pin LQFP 28-pin PLCC Package Type Standard (non-Pb-free) Standard (non-Pb-free) Green/RoHS compliant Green/RoHS compliant Part Name A5191HRTL A5191HRTP A5191HRTLg A5191HRTPg Ordering Code* 12197-503-XTP 12197-504-XTP 12197-507-XTP 12197-508-XTP
*The part number extension -XTP refers device being shipped tape reel. suffix -XTD refers shipment tubes tray.
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A5191HRT AMIS HARTModem
Electrical Specifications
Table Absolute Maximums Symbol VIN, VOUT
Cautions: CMOS devices damaged high-energy electrostatic discharge. Devices must stored conductive foam with pins shunted. Precautions should taken avoid application voltages higher than maximum rating. Stresses above absolute maximum ratings result damage device. Remove power before insertion removal this device.
Parameter Ambient Storage temperature Supply voltage input,output Re-flow solder profile
Min. -0.3 -0.3
Max. VDD+0.3 IPC/JEDEC J-STD-020C
Units
Table Characteristics
3.0V 5.5V, -40°C +85°C
Symbol Parameter Input voltage, Input voltage Output voltage, (IOL 0.67mA) Output voltage, high (IOH -0.67mA) Input capacitance Analog input IRXA Digital input Input leakage current Output leakage current Power supply current (RBIAS 500kW, IAREF 1.235V) Analog reference Carrier detect reference (IAREF 0.08V) Comparator bias current (RBIAS 500kW, IAREF 1.235V) 1.235 1.15 +500 0.7*VDD Min. Typ. Max. 0.3*VDD Units
IIL/IH IOLL IAREF ICDREF* OCBIAS
*The HART specification requires carrier detect (OCD) active between mVp-p. Setting ICDREF IAREF 0.08 will carrier detect nominal mVp-p.
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A5191HRT AMIS HARTModem
Table Characteristics
3.0V 5.5V, -40°C +85°C
Name IRXA Description Receive analog input Leakage current Frequency mark (logic Frequency space (logic Output high-pass filter Slew rate Gain bandwidth (GBW) Voltage range Carrier detect receive filter input Leakage current Modulator output Frequency mark (logic Frequency space (logic Amplitude (IAREF 1.235V) Slope Loading (IAREF 1.235V) Receive digital output Rise/fall time Carrier detect output Rise/fall time Min. Typ. Max. +150 1210 2220 Units
1190 2180
1200 2200
ORXAF
0.15
0.025
V/ms 0.15 V/ms +500 mVp-p mV/ms
IRXAC
OTXA
1196.9 2194.3 2.79
ORXD
modular output frequencies proportional input clock frequency (460.8kHz).
Table Modem Characteristics
3.0V 5.5V, -40°C +85°C
Parameter Demodulator Jitter Conditions Input frequencies 1200Hz 10Hz, 2200Hz 20Hz Clock frequency 460.8kHz 0.1% Input (HLXA) asymmetry, Min. Typ. Max. Units
Table Ceramic Resonator External Clock Specifications
3.0V 5.5V, -40°C +85°C
Parameter Resonator Tolerance Frequency External Clock frequency Duty cycle Amplitude Min. Typ. Max. Units
460.8 460.8
456.2
465.4
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A5191HRT AMIS HARTModem
Mechanical Specifications
Symbol
Min. .165 .099 .485 .450 .390 .485 .450 .390
Nom. .172 .101 .490 .452 .420 .300 .490 .452 .420 .300 .050
Max. .180 .110 .495 .455 .430 .495 .455 .430
Figure Lead PLCC
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A5191HRT AMIS HARTModem
Symbol
Min. 0.05 1.35
Nom. 0.10 1.40 9.00 4.50 7.00 9.00 4.50 7.00
Max. 1.60 0.15 1.45
0.45 0.30 0.09
0.60 0.80 0.37
0.75 0.45 0.20 0.10 0.20
Figure Lead LQFP
Semiconductor www.amis.com
Devices sold AMIS covered warranty patent indemnification provisions appearing Terms Sale only. AMIS makes warranty, express, statutory, implied description, regarding information forth herein regarding freedom described devices from patent infringement. AMIS makes warranty merchantability fitness purposes. AMIS reserves right discontinue production change specifications prices time without notice. Semiconductor's products intended commercial applications. Applications requiring extended temperature range, unusual environmental requirements, high reliability applications, such military, medical life-support life-sustaining equipment, specifically recommended without additional processing AMIS such applications. Copyright ©2005 Semiconductor, Inc.
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