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U3 D3
8 3 2
PIC 16C57 X1 U7
28 8 9 1 4
C16 C17 R14 S2
12 9 11 10 16 2 8 3
13 4
J1 J1-1 -2 -3 -4
C6 R5 C5 R6
R8 C7 R9
14 2
D5 C8 5
7 1 3 4 5 15 5 6 7
X2 C14 C15
1 2 M0 3 M1 4 RXIN 5 6 7 8
5V MX604 U5
16 15 14 13 12 11 10 9 VDD RXD CLK VBIAS
C12 R20
C10 C11
5V R16 R17 R18 R19 J3-1 5V
RXAMPOUT
5V C2
C13 J3-4
S4 Figure 23-2 Data-Term circuit.
310 DATA-TERM UNIT
MX604 contains an FSK modulator and demodulator as well as filters, buffers, timing, and logic control functions. Figure 23-3 is a block diagram of the of the MX604 modem chip. Table 23-1 is the pinout list for the MX604 modem chip. Crystal X2 is used as a frequency reference for the modem. Incoming audio signals are coupled via pins 5 and 6, while outgoing data signals leave the modem on pin 13. M0 and M1, i.e., pins 3 and 4, are used to program the modem states; see Table 23-2. Initially the BASIC STAMP 2 applies a high, or 5-V signal to pins 3 and 4 to initialize the modem. Then the mode is set to receive at , 1200 baud. The STAMP 2 applies the clock control signals to the modem at pin 12. In order to turn the BS2 look-alike into a Data-Term project, a few more parts must be added to the basic configuration. Table 23-3 lists the BS2 pinouts First, you need to configure pins 10 through 13 as user inputs. Momentary pushbutton switches S1 to S4 are used for future activation of Data-Term functions, such as display scrolling and manual control. A resistor is placed across each input line to 5 V Additionally, pins 18, 8, and 28 are con. figured as inputs. Pin 18 is used for ringer detect, while pins 8 and 28 are used for serial communication inputs. The Data-Term project has many pins that are used for outputs. Pins 16 and 17 are outputs configured to animate the modem, while pin 19 is used to connect the phone line. Pins 20 and 21 are used to send X10 information to the power line controller. Pin 22 drives the LCD display, while pin 23 controls the buzzer. Pin 24 is used to light the status LED, and pin 25 is free for future use. Pin 9 of U7 is used for serial communication output. The 2-kbyte external memory chip at U6 is coupled to the microprocessor via pins 6 and 7. A 20-MHz reference crystal is connected across pins 27 and 28 of the processor. Power for the processor is a regulated 5-V supply provided by U1. A 9- to 12-V wall wart power supply can be used to power the regulator input. Five-volt power is supplied to pin 2 of U7, while ground is applied to pins 1 and 4. A microprocessor reset is furnished between pin 28 and ground. The microprocessor communicates serially via U8, a MAX-232 chip. The MAX-232 requires only four 1- F capacitors to operate. The output of the MAX-232 requires a diode D5 and resistor R15 to interface to your personal computer in order to download the software.
XTAL/ CLOCK XTAL VDD VBIAS VSS RXAMPOUT RXIN
XTAL Osc and clock divider Energy detect Mode control logic RX filter and equalizer VBIAS XMIT buffer and output buffer FSK demodulator RX/TX Data Re-timing
RXEQ
DET M1 M0
RXD CLK RDY TXD
TXOUT
FSK modulator
Figure 23-3 MXCOM MX604 modem.
BUILDING THE DATA-TERM UNIT 311
TABLE 23-1 PIN NUMBER
MXCOM MX604 MODEM PINOUTS NAME DESCRIPTION
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
XTAL output XTAL/CLOCK M0 M1 RXIN RXAMPOUT TXOUT VSS VBIAS RXEQ TXD CLK TXD DET RDY VDD
Output of the crystal oscillator inverter Input to the crystal oscillator inverter A logic input for mode setting A logic input for mode setting Input to the RX input amplifier Output of the RX input amplifier Output of FSK generator Negative supply voltage Internal bias voltage held at Vdd /2 An input to enable/disable equalizer An input for FSK modulator /retiming An input used to clock in/out bits Output from FSK demod or retiming data An output of on-chip energy detector Ready for data, used for retiming Positive voltage pin
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