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參數(shù)資料
| 型號(hào)： | NCN5192MNRG |
| 廠商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 12/13頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC HART MODEM CMOS SGL 32QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | * |
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NCN5192
http://onsemi.com
8
Functional Description
The NCN5192 is a single-chip modem for use in Highway
Addressable Remote Transducer (HART) field instruments
and masters. The modem IC contains a transmit data
modulator with signal shaper, carrier detect circuitry, an
analog receiver, demodulator circuitry and an oscillator, as
shown in the block diagram in Figure 1.
The modulator accepts digital data at its digital input TxD
and generates a trapezoidal shaped FSK modulated signal at
the analog output TxA. A digital “1” or mark is represented
with a frequency of 1200 Hz. A digital “0” or space is
represented with a frequency of 2200 Hz. The used bit rate
is 1200 baud.
The demodulator receives the FSK signal at its analog
input, filters it with a band-pass filter and generates 2 digital
signals: RxD: Received Data and CD: Carrier Detect. At the
digital output RxD the original modulated signal is received.
CD outputs the Carrier Detect signal. It goes logic high if the
received signal is above 100 mVpp during 4 consecutive
carrier periods.
The oscillator provides the modem with a stable time base
using either a simple external resonator or an external clock
source.
Detailed Description
Modulator
The modulator accepts digital data in NRZ form at the
TxD input and generates the FSK modulated signal at the
TxA output.
PC20101117.1
Sine
Shaper
Numeric
Controlled
Oscillator
MODULATOR
TxA
TxD
RTS
FSK_OUT
Figure 4. Modulator Block Diagram
A logic “1” or mark is represented by a frequency fm =
1200 Hz. A logic “0”or space is represented by a frequency
fs = 2200 Hz.
t
tBIT = 833 ms
“1” = Mark
1.2 kHz
“0” = Space
2.2 kHz
KVDE20110407.5
tBIT = 454 ms
Figure 5. Modulation Timing
The Numeric Controlled Oscillator (NCO) works in a
phase continuous mode preventing abrupt phase shifts when
switching between mark and space frequency. The control
signal “Request To Send” (RTSB) enables the NCO. When
RTSB is logic low the modulator is active and NCN5192 is
in transmit mode. When RTSB is logic high the modulator
is disabled and NCN5192 is in receive mode.
The digital outputs of the NCO are shaped in the Wave
Shaper block to a trapezoidal signal. This circuit controls the
rising and falling edge to be inside the standard HART
waveshape limits. Figure 6 shows the transmit-signal forms
captured at TxA for mark and space frequency. The slew
rates are SRm = 1860 V/s at the mark frequency and SRs =
3300 V/s at the space frequency. For AREF = 1.235 V, TxA
will have a voltage swing from approximately 0.25 to
0.75 VDC.
t (ms)
0
VTxA
0.5 V
1
2
t (ms)
VTxA
“1” = Mark; fm =1.2 kHz
“0” = Space; fs =2.2 kHz
KVDE20110408
0
1
2
SRm = 1860 V/s
0.5 V
SRs = 3300 V/s
0.5 V
Figure 6. Modulator shaped output signal for Mark
and Space frequency at TxA pin.
Demodulator
The demodulator accepts a FSK signal at the RxA input
and reconstructs the original modulated signal at the RxD
output. Figure 7 illustrates the demodulation process.
tBIT
IDLE (mark)
LSB
MSB
IDLE (mark)
tBIT
8 data bits
D0
Start
D1
D2
D3
D4
D5
D6
D7
Stop
Par
“0”
“1”
“0”
“1”
“0”
“1”
“0”
“1”
FSK_IN
RxD
PC20101013.4
Figure 7. Modulation Timing
This HART bit stream follows a standard 11-bit UART
frame with Start, Stop, 8 Data – and 1 Parity bit (odd). The
communication speed is 1200 baud.
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