xecom XE0068DT 2-18-94 FCC Registered Phone Line Interface with Tone Transmitter/Decoder Description The XE0068DT is an FCC registered telephone line interface which includes a DTMF transmitter, decoder and call progress monitor. FCC rules limit transmit level and require a 2-second billing delay at the start of each call. The XE0068DT does not merely clamp the incoming signal which could cause signal distortion; but, uses an Automatic Gain Control circuit to optimize the transmit level over a wide range of input signal levels. The integral DTMF transmitter, decoder, and call progress monitor makes the XE0068DT ideal for network signalling applications. Block Diagram Features * Small Size - 2.28" x 1.08" x 0.42" * FCC Part 68 Registered * Ring Detection and Hookswitch Control * 1500 Volt Isolation; * 800 Volt Surge Protection; * An Integral 2-Second Billing Delay * Auotomatic Gain Control optimizes transmit level for any input level. * Integral DTMF transmitter and decoder * Call progress Monitor PIN CONFIGURATION CAUTION: Pins 24 & 26 have 1500V isolation from the rest of the circuitry. This isolation must be preserved Pin Descriptions PIN 1 2-5 NAME I/0 DESCRIPTION VCC --- +5 Volts D0-D3 I/O These singals represent the 4-bit data bus which carries the DTMF information per the chart below. 6 WR I Read and Write determine the direction of DTMF data. A low on WR with RD high allows the processor to write to the XE0068DT. 7 RD I Read and Write determine the direction of DTMF data. A low on RD with WR low allows the processor to read from the XE0068DT. 8 CS I A low on Chip Select, selects the XE0068 DTMF data bus. 9 RS0 I This input selects the register to be used. A low selects the data register. 13 D/V I A low on Voice/Data selects a transmit level of 0 dBm for voice or DTMF; a high sets a -9 dbm transmit level for data transfer. 14 GND --- Ground 15 CP O In DTMF mode CP acts as an interrupt. CP goes low when a valid DTMF Tone is transmitted or received. In Call Progress Mode CP provides a square wave representation of the call progress signal on the phone line. 16 ESt O Goes high to indicate that a valid tone pair has been detected. A momentary loss of signal causes ESt to go low. 17 St/GT I/O As an input, ST/GT latches the DTMF code into the Receive Data Register when the threshold voltage is reached. As an output, St/GT goes high to disable the guard timer after the threshold voltage is reached. 18 XMIT I Analog input signal to the line interface, input impedance on XMIT is typically 10 Kohms at 1800 Hz. Signals from -15 to +5 dBm will be placed on the line at -10dBm + 1 dBm. 19 RCVR O Analog output signal from the 2-4 wire converter, the output impedence of RCVR is typically 10 ohms at 1800 hz. 21 OH I Hookswitch control. A high closes the internal relay to connect the equipment to the phone line. 22 RI O Ring Indicate, output, active low, TTL, indicates the modem is receiving a ring signal. 24 Ring --- Ring connection to the phone line (RJ11 Pin 4). 26 Tip --- Tip Connection to the phone line (RJ11 Pin 3) 2/XECOM XE0068DT Register Selection RS0 WR RD Function 0 0 1 Write to Transmit Data Register 0 1 0 Read from Receive Data Register 1 0 1 Write to Control Register 1 1 0 Read from Control Register DTMF Digit Codes Data Bits DTMF Digits 1 2 3 4 5 6 7 8 9 0 * # A B C D D0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 D1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 D2 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 D3 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 Status Register A Bit Indicator Status Set Status Cleared 0 IRQ An interrupt has occurred Interupt Inactive 1 Transmit Data Register Empty Transmitter ready for new data Status has been read or is in non-burst mode 2 Receive Data Register Full The Receive Data Register contains valid data Status register has been read 3 Delayed Steering Set upon valid detection of the absence of a DTMF signal cleared upon detection of a valid DTMF signal XE0068DT XECOM/3 Control Register A Bit Signal Function 0 TOUT Tone output control: This bit controls all tone transmit functions. A high enables the tone output; a logic low turns the tone output off. 1 CP/DTMF Call Progress/DTMF Mode: A logic high enables the XE0068DT to receive call progress tones. A low enables DTMF mode for sending or receiving DTMF tones. In call progress mode, a square wave representation of the incoming signal will be present on the CP output if IRQ has been enabled. DTMF tones cannot be detected in the Call Progress mode. Only tones in the 250 to 600 Hz range can be detected. 2 IRQ Interrupt Enable: A logic high enables the interrupt function. When IRQ and DTMF Mode are enabled, the CP output will go lo when either a valid DTMF signal is received or the transmitter is ready for more data. 3 RSEL Register Select: A logic high selects Control Register B for the next write cycle. After writing to Control Register B, the following control register write cycle will be directed to Control Register A. Control Register B Bit Signal Function 0 BURST 1 Test Test Mode: A logic high enables XE0068DT test mode. When test and DTMF modes are selected, the signal on CP will be reflect the state of the delayed steering bit of the status register. 2 S/D Single or Dual Tone: A logic high selects single tone generation a low selects dual tone generation. Selection of single tone frequencies requires the use of Control Register B bit 3 as well. 3 C/R Column or Row Tone Selection: A logic high selects a colomn tone output, a low selects a row tone output. 4/XECOM Burst Mode: A logic low enables burst mode. When activated, DTMF tones can be transmitted by writing the correct code into the transmit register. The XE0068DT then transmits the tone burt, typically 51 milliseconds on, 51 milliseconds off, changes the status register to Transmit Data Register Empty, and provides an interrupt. In Call Progress mode tone burst and pause durations are doubled to 102 milliseconds. When burst mode is inactive duration is determined by TOUT. (Control Register A) XE0068DT Electrical Specification (Vcc=+5v ±5%, Ta=0 to 70 deg C) Parameter Conditions Min Typ Max Units Power Supply Current Ring Indicate Active Coupler Match Output impedance of external 531 AGC Input Range Maintaining steady output level -15 AGC Output Level D/V held high -11 -10 -9 dBm AGC Output Level D/V held low -2 -1 0 dBm 2.0 2.3 seconds Billing Delay 20 536 mA 541 ohms +10 dBm Transhybrid Loss at 1000 Hz -27 dBm Receive Loss at 1000 Hz 0 dB Ring Detect Sensitivity Min. AC voltage between Tip & Ring Type B ringer Ring Indicate Output Voltage Ring Voltage present on Tip & Ring Loop Current Switch control voltage ON: (off-hook) Control Voltage OFF: (on-hook) Loop Current Switch Off-hook Control Current Loop Current OFF-Hook current draw from Telephone Line Data Bus, Low Level Input Voltage High Level Input Voltage DTMF tones Call Progress Tones Receive Sensitivity 38 vrms 0.2 0.5 volts 3.0 0.2 0.5 volts volts 0.1 0.2 mA 20 100 mA 0.8 2.0 volts volts -37 -30 dBm dBm 2.0 0 Tone Duration to Detect Tone Frequencies XE0068DT 40 DTMF Transmission, 697 770 852 941 1209 1336 1477 1633 msec hz XECOM/5 Typical Connection Diagram Call Progress Detection Circuit 6\XECOM XE0068DT Operational ModesControl Burst Mode Register A Burst mode is used to transmit DTMF signals of specific duration. The XE0068DT transmitter sends symmetric tone bursts which are on for 51 milliseconds and off for 51 milliseconds. This is a standard interval for central office switching. When call progress mode is also selected extended bursts of 102 milliseconds can be sent. Single Tone Generation Single tones , rather than tone pairs , may also be generated. Control Register B regulates single tone transmission. Call Progress Mode Call Progress Mode allows detection of the various tones used to identify the status of a call. They include Ring Back, Busy Tone Dial Tone, etc. In call Progress Mode the XE0068DT provides a square wave representation of these signals on the CP pin. The system host can decode the incoming call progress tones. Initialization Procedure*Control Description Control Lines RS0 WR RD Register A B3 Data Bits B2 B1 B0 Read Status Register 1 1 0 X X X X Write to Control Register 1 0 1 0 0 0 0 Write to Control Register 1 0 1 1 0 0 0 Write to Control Register 1 0 1 0 0 0 0 Write to Control Register 1 0 1 0 0 0 0 * Performs a software reset on the XE0068DT XE0068DT XECOM/7 Call Progress Tone Definitions Tone Frequency (Hz) Cadence ON/OFF Level Description Dial Tone 350 + 400 Steady -13 dBm indicates the network is ready to receive dialling signals; Ringback 440 + 480 2 sec./4 sec. -19 dBm Indicates the called line is ringing; Busy Tone 480 + 620 .5 sec./.5 sec. -24 dBm Called line has been reached but is currently in use. Reorder 480 + 620 .25 sec./.25 sec -24 dBm Indicates the switching path is busy. Partial Dial Tone 480 Steady -17 dBm Notifies calling party dialing has not begun in the allotted time or not enough digits have been dialed; Read/Write Clock Pulse Signal Definition TR RD/WR rise time 20 nanoseconds TF RD/WR fall time 20 nanoseconds TCYC RD/WR cycle period 250 nanoseconds TPWH RD/WR pulse width high 100 nanoseconds TPWL RD/WR pulse width low 8/XECOM Min 150 Typ Max Units nano seconds XE0068DT Read Timing Signal TAS TAH TPWH TPWL TDDR TDHR Definition Address setup time Address hold time RD/WR pulse width high RD/WR pulse width low Read to Valid Data Data hold time (Read) Min 23 26 Typ Max 100 150 100 22 Units nanoseconds nanoseconds nanoseconds nano seconds nanoseconds nanoseconds Write Timing Signal TAS TAH TPWH TPWL TDDR TDHR XE0068DT Definition Address setup time Address hold time RD/WR pulse width high RD/WR pulse width low Data Setup time (write) Data hold time (write) Min 23 26 Typ 100 150 45 10 Max Units nanoseconds nanoseconds nanoseconds nano seconds nanoseconds nanoseconds XECOM/9 Mechanical Specifications DIM A B C D E F G H J K INCHES METRIC(MM) MIN MAX MIN 2.270 1.065 0.420 0.890 1.190 0.125 0.080 0.530 0.090 0.020 2.290 1.095 0.430 0.910 1.210 0.200 0.100 0.550 0.110 0.025 57.66 27.05 12.32 22.61 30.23 3.18 2.03 13.46 2.29 0.51 XECOM\10 MAX 58.17 27.81 13.08 23.11 30.73 5.08 2.54 13.97 2.79 0.64 Pins are 0.025" square, tin plated Recommended PCB hole size is 0.056" XE0068DT FCC Instructions This product complies with part 68 of the FCC Rules and Regulations. With each device shipped, ther is a lable which contains, among other informaton, the FCC Registration Number and Ringer EquivalenceNumber (REN) for this product. You must, upon request, give this information to your telephone company. Mounting this device in the final assembly must be made in such a manner as to preserve the high voltage protection between the TIP/RING connection and the rest of the system. Typically, this may be accomplished by maintaining a minimum spacing .100 mils between the TIP/RING trace to the RJ-11C Jack and low voltage portion of the system. No additional circuitry may be attached between TIP/RING and the telephone line connection unless specifically allowed in the rules. The REN is useful to determine the quantity of devices you may connect to the telephone line and still ave all of these devices ring when the number is called. In most, but not all areas, the sum of the RENs of all devices connected to one line should not exceed five (5.0). To be certain of the number of devices you may connect to the line, as determined by the REN, you should contact the local telephone company to determine the maximum REN for your calling area. If your system causes harm to the tlephone network, the telephone company may discontinue service temporarily. If possible, they will notify you in advance. If advance notification is not practical, you will be notified as soon as possible. Your telephone company may make changes in its facilities, equipment, operations or procedures that could affect proper functioning of your equipment. If they do, you will be notified in advance to give you an opportunity to maintain uninterrupted service. If you experience trouble with the device, please contact XECOM an (408)945-6640 for information on obtaining service or repairs. The telephone company may ask you to disconnect this device from the network until the problem has been corrected or until you are sure that the device is not malfunctioning. The device may not be used on coin service lines provided by the telephone company (this does not apply to private coin telephone applications which use standard telephone lines). Connection to party lines is subject to state tariffs. FCC Registration Number: DWEUSA-XXXXX-XX-X JACK RJ11C RINGER EQUIVALENCE = X.XB XE0068DT XECOM/11 Terms of Sale Devices sold by XECOM are covered by the warranty provisions appearing in its Terms of Sale only. XECOM makes no warranty, express, statutory, implied, or by description regarding the information set forth herein, or regarding the freedom of the described devices from patent infringement. XECOM makes no warranty of merchantability or fitness for any purposes. XECOM reserves the right to discontinue production and change specifications and prices at any time and without notice. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment, are specifically not recommended without additional processing and authorization by XECOM for such application. Xecom assumes no responsibility for the use of any circuitry other than circuitry embodied in a Xecom product. No other circuits, patents, or licenses are implied. Life Support Policy Xecom's products are not authorized for use as Critical Components in Life Support Devices or Systems. Life Support Devices or Systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform, when properly used in accordance with instructions provided in the labeling, can be reasonably expected to result in significant injury to the user. A Critical Component is any component of a life support device or system whose failure to perform can be reasonably expected to cause failure of the life support device or system, or to affect its safety or effectiveness. Copyright, Xecom © 1994 While Xecom, Inc. has made every effort to ensure that the information presented here is accurate, Xecom will not be liable for any damages arising from errors or omission of fact. Xecom reserves the right to modify specifications and/or prices without notice. Product mentioned herein are used for identification purposes only and may be trademarks and/or registered trademarks of their respective companies. xecom Xecom Incorporated 374 Turquoise Street, Milpitas, CA 95035 Ph:408 -945 -66 40 Fax: 408 - 942-1346