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NCN5192NGEVB
NCN5192NG Evaluation
Board User's Manual
Introduction
The NCN5192NGEVB includes all external components
needed for operating NCN5192 and demonstrates the small
PCB surface area such an implementation requires. The
EVB allows easy design of HART implementations using
NCN5192.
Overview
The NCN5192 is a single-chip, CMOS modem for use in
highway addressable remote transducer (HART) field
instruments and masters. The modem and a few external
passive components provide all of the functions needed to
satisfy HART physical layer requirements including
modulation, demodulation, receive filtering, carrier detect,
and transmit-signal shaping.
The NCN5192 also includes an internal 16-bit
sigma-delta modulation DAC for easy implementation of
slave devices. An SPI bus provides easy communication to
this DAC and internal registers.
www.BDTIC.com/ON/
© Semiconductor Components Industries, LLC, 2012
October, 2012 − Rev. 4
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Figure 1. NCN5192NGEVB Evaluation Board
1
http://onsemi.com
EVAL BOARD USER'S MANUAL
Single-chip, Half-duplex 1200 bits per Second FSK
Modem
Bell 202 Shift Frequencies of 1200 Hz and 2200 Hz
3.0 V − 5.5 V Power Supply
Transmit-signal Wave Shaping
Receive Band-pass Filter
Low Power: Optimal for Intrinsically Safe Applications
Compatible with 3.3 V or 5 V Microcontroller
Internal Oscillator with 1.84 MHz Crystal
Meets HART Physical Layer Requirements
Includes 16-bit DAC for Slave Implementation
Industrial Temperature Range of −40°C to +85°C
Available in 32-pin QFN
HART Multiplexers
HART Modem Interfaces
4-20 mA Loop Powered Transmitters
Publication Order Number:
EVBUM2047/D
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Summary of Contents for ON Semiconductor NCN5192NGEVB
- Page 1 Board User's Manual http://onsemi.com EVAL BOARD USER’S MANUAL Introduction Features • The NCN5192NGEVB includes all external components Single-chip, Half-duplex 1200 bits per Second FSK needed for operating NCN5192 and demonstrates the small Modem PCB surface area such an implementation requires. The •...
- Page 2 NCN5192NGEVB Table 1. ELECTRICAL CHARACTERISTICS OF THE NCN5192NGEVB BOARD Symbol Characteristic Units Supply Voltage 2.80 3.00 6.00 Current Consumption = 2.80 V, idle − − = 3.00 V, idle − − = 6.00 V, idle − − External Clock, V = 3.00 V, idle...
- Page 3 NCN5192NGEVB NCN5192NGEVB DESCRIPTION Schematic Diagram − BOM List Figure 2. NCN5192NGEVB Schematic www.BDTIC.com/ON/ http://onsemi.com...
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Page 4: General Overview
NCN5192NGEVB Table 2. NCN5192NGEVB BILL OF MATERIALS Reference Manufacturer & Comments Value Size Quantity 100 nF 0603 27 pF 0603 1 mF 0603 470 nF 0603 1 nF 0603 220 pF 0603 Do Not Populate 0603 , IDC , IDC... - Page 5 Power Supply and References Power Supply Current consumption of the module is very limited, The NCN5192NGEVB is designed for a nominal voltage making it ideal to be battery or loop-powered. of 3 V. However, NCN5192 can be operated up to 6 V. For...
- Page 6 Value 5 V, a 2.5 V reference voltage is recommended. AREF Reference Voltage 1.248 V For NCN5192NGEVB, a series regulator is used with an CDREF Reference Voltage 1.163 V internal reference of 1.25 V. The chosen regulator has a very low supply current, to optimize power usage.
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Page 7: Clock Generation
NCN5192 is operated on a clock signal of either modem to shut down the oscillator circuit. A typical current 460.8 kHz, 921.6 kHz or 1.84 MHz. The NCN5192NGEVB consumption witnessed by utilizing an external oscillator is 70-100 mA less. However, care must be taken that this has two options for providing this clock signal. - Page 8 NCN5192NGEVB The interface towards a microcontroller is provided in time base in another device is at 101% of nominal, the . This interface can also be used to supply power to the receive data (at the receiving UART) will be skewed by module.
- Page 9 NCN5192NGEVB Table 5. SPI/DAC INTERFACE Pin Number Signal Type Description Output DAC Output Input SPI Clock DATA Input SPI Data in (MOSI) Input SPI Chip Select 1, 2, 3, 7, 9, 10 Power At reset of the device, all bits of the internal register are set wave shaping and activating the internal watchdog kick.
- Page 10 NCN5192NGEVB By default the DAC is set to 14-bit, RTZ (return to zero) However, operating the DAC in RTZ mode limits the mode. The DAC can be set to either RTZ or non-RTZ mode. operational range of the DAC to half of the voltage applied This is important when rise and fall times are not identical.
- Page 11 The receive band pass filter is implemented on the Reference Value E12 (Low-cost) NCN5192NGEVB. The values are listed in Table 6 and the filter schematic is displayed in Figure 16. This is a band pass 220 kW, 1% filter based on a Sallen-Key topology allowing only...
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Page 12: Application Ideas
NCN5192NGEVB APPLICATION IDEAS The NCN5192 takes care of the HART modulation. This by including an integrated DAC. Below are some possible HART signal must then be superimposed on a 4-20 mA implementations of both a master and slave transmitter. current loop. The NCN5192 simplifies slave implementation Slave Implementation A simple slave implementation is shown in Figure 18. - Page 13 NCN5192NGEVB is a virtual ground, as this assumption is only valid for DC signals. We can, however, find a relationship between input amplitude and output amplitude. We know that the positive Reconfiguring for the unknown R amplifier input voltage has the following form, due to the...
- Page 14 NCN5192NGEVB Figure 19. Sample Master Implementation www.BDTIC.com/ON/ http://onsemi.com...
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Page 15: Evaluation Board Layout
PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: N. American Technical Support: 800−282−9855 Toll Free ON Semiconductor Website: www.onsemi.com Literature Distribution Center for ON Semiconductor USA/Canada Order Literature: http://www.onsemi.com/orderlit P.O. Box 5163, Denver, Colorado 80217 USA Europe, Middle East and Africa Technical Support: Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada...
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