CMX624 CML Microcircuits, CMX624 Datasheet
CMX624
Available stocks
Related parts for CMX624
CMX624 Summary of contents
Page 1
... Power' standby mode. Whilst in standby the ring detector continues to operate and will supply the host µController with an interrupt when line reversal or ringing is detected. The CMX624 can operate on a supply voltage between 3.0V and 5.5V across the full temperature range of -40°C to +85°C. ...
Page 2
... Application Notes....................................................................................14 1.6.1 Line Interface..............................................................................15 1.6.2 Ring Detector Interface .............................................................17 1.7 Performance Specification.....................................................................19 1.7.1 Electrical Performance..............................................................19 1.7.2 Packaging....................................................................................24 Note: This product is in development: Changes and additions will be made to this specification. Items marked TBD or left blank will be included in later issues. 2001 Consumer Microcircuits Limited CONTENTS 2 CMX624 Page D/624/6 ...
Page 3
... V23 / Bell 202 Modem 1.2 Block Diagram 2001 Consumer Microcircuits Limited Figure 1 Block Diagram 3 CMX624 D/624/6 ...
Page 4
... V BIAS decoupled capacitor mounted close SS to the device pins. O/P Relay drive open drain output. This output is pulled down to V when active and is high SS impedance when inactive. I/P The non-inverting input to the Rx input amplifier. 4 CMX624 / Should be SS D/624/6 ...
Page 5
... This device is capable of detecting and decoding small amplitude signals. To achieve this V decoupling and protecting the receive path from extraneous in-band signals are very important recommended that the printed circuit board is laid out with a ground plane in the CMX624 area to provide a low impedance connection between the V ...
Page 6
... General Description The CMX624 contains a V.23/Bell 202 compatible FSK modem capable of duplex operation at 1200/75 or 1200/150 bps over a 2-wire line or 1200/1200 bps over a 4-wire line, a flexible FSK data UART, a receive FSK or Call Progress Tone energy detector, a 2100Hz detector, a DTMF generator line driving buffer amplifier, a telephone line Ringing Signal or Line Voltage Reversal detector and a 3.579545MHz Xtal oscillator. These functions are all controlled over a ‘ ...
Page 7
... Figure 3b ETS 300 114 Test Line 1 Characteristics (Normalised) 2001 Consumer Microcircuits Limited 1000 Hz see section 1.6.1 (equaliser disabled) 500 1000 1500 2000 2500 Hz 7 1200bps 75/150 bps Call Progress 10000 dB wrt 800Hz ms wrt 1700Hz 3000 3500 4000 CMX624 D/624/6 ...
Page 8
... TX TONES = ‘0’) Disabled (o/p held 75bps FSK 1200bps FSK 8 Bit 4 Detection Mode 0 Call Progress 150 bps FSK 1 1200 bps FSK 1 2100 Hz FSK Signal Frequency ‘0’ (Space) ‘1’ (Mark) - 450Hz 390Hz 2100Hz 1300Hz CMX624 - D/624/6 ...
Page 9
... Single Tone (Bit 4 = ‘1’) Keypad Single Tone Legend Frequency (Hz) D 1633 1 1209 2 1336 3 1477 4 1209 5 1336 6 1477 7 1209 8 852 9 852 0 941 * 941 # 941 A 697 B 770 C 852 DTMF Tone (High group) -5dB -3dB -2dB 0dB CMX624 - D/624/6 ...
Page 10
... If this block is not used, then the RD and RT pins should be connected to V bit (5) of the IRQ MASK Register set to ‘0’. 2001 Consumer Microcircuits Limited Bell 202 V23 100 1000 . If this is not required the TXON output can be disabled 10000 100000 and the ‘Ring Detect Change’ SS CMX624 D/624/6 ...
Page 11
... FLAGS Register being set to ‘1’ and if the ‘Tx Async’ mode of operation had been selected then a continuous Mark (‘1’) signal will then be transmitted until a new value is loaded into TX DATA, whereas in ‘Tx Sync’ mode the byte already in the TX DATA Register will be re-transmitted. 2001 Consumer Microcircuits Limited Figure 6a Transmit UART Function (Async) 11 CMX624 D/624/6 ...
Page 12
... Demodulator and transfer them to the RX DATA Register (the first bit going into the D0 position). Note that this mode is intended for detection of simple data patterns such as ‘1010…’ or continuous Mark or Space signals, the CMX624’s receive data clock extraction circuits are not adequate to support a true synchronous receive data mode of operation. ...
Page 13
... CMX624’s Write Only Registers single byte of data read out from one of the CMX624’s Read Only Registers, as illustrated in Figure 7. Data sent from the µC on the Command Data line is clocked into the CMX624 on the rising edge of the Serial Clock input. Reply Data sent from the CMX624 to the µC is valid when the Serial Clock is high. The interface is compatible with the most common µ ...
Page 14
... Bit 5 (Ring Detect Change) of the FLAGS Register is set on every ‘0’ to ‘1’ or ‘1’ to ‘0’ change of bit 6 (Ring Detect). 4. Clearing bit 4 of the SETUP Register puts the CMX624 into the Zero Power mode by turning off all blocks except for the ‘C-BUS’ interface and Ring Detector circuit. 5. ...
Page 15
... See text R12 100k 2001 Consumer Microcircuits Limited 4-wire line. The line terminations are provided by R10 at 5.0V, or 130k at 3.0V. R13 See text R14 100k R15 600 Resistors 1%, capacitors 20%. Figure 8a 4-Wire Line Interface Circuit 15 CMX624 C10 100nF C11 220pF C12 330pF C13 100nF D/624/6 ...
Page 16
... Line Interface Figure 8b shows an interface circuit suitable for connection to a 600 a relay may be driven from the RLYDRV pin. Note that when the CMX624 is powered from less than 5.0V, buffer circuitry will be required to drive a 5V relay. Note ac and dc loads and line protection not shown for clarity. ...
Page 17
... The signal at point X is further attenuated by the potential divider formed by R22 and R23 before being applied to the CMX624 RD input. If the amplitude of the signal appearing greater than the input threshold (Vthi) of Schmitt trigger 'A' then the N transistor connected to RT will be turned on, pulling the voltage discharging the external capacitor C22 ...
Page 18
... Ring signal and a line voltage reversal by measuring the time that bit 6 of the FLAGS Register (Ring Detect) is high. 2001 Consumer Microcircuits Limited towards V can be derived from the formula exp(-t/(R24 x C22 and 0.33 F) give a minimum RT charge time of 100 18 CMX624 , then the DD D/624/6 ...
Page 19
... Min. Max. Unit 800 mW 13 mW/°C -55 +125 °C -40 +85 °C Min. Max. Unit 550 mW 9 mW/°C -55 +125 °C -40 +85 °C Min. Max. Unit 800 mW 13 mW/°C -55 +125 °C -40 +85 °C Min. Max. Unit 2.7 5.5 V -40 +85 °C 3.575965 3.583125 MHz CMX624 D/624/6 ...
Page 20
... Schmitt trigger input low-going threshold (Vtlo) (see Figure 11) RLYDRV ‘ON’ resistance to V Notes not including any current drawn from the CMX624 pins by external circuitry other than X1, C1 and C2. 2. All logic inputs Excluding RD, RT and XTAL/CLOCK pins. ...
Page 21
... TBD 150 TBD TBD 387 TBD TBD 487 TBD = 5.0V. The internal threshold levels are DD Min. Typ. Max. 2040 - 2235 <2010 - >2265 - - 25 4 CMX624 Unit dBm dB % Unit dB Vp-p Unit dBm dB dB Baud Hz Hz Baud Hz Hz Baud Hz Hz Baud Hz Hz Unit ...
Page 22
... Reply Data Hold time RDH Note: These timings are for the latest version of the ‘C-BUS’ as embodied in the CMX624, and allow faster transfers than the original ‘C-BUS’ timings given in CML Publication D/800/Sys/3 July 1994. 2001 Consumer Microcircuits Limited ...
Page 23
... V23 / Bell 202 Modem 3.5 3 2.5 2 Vin 1.5 1 0.5 0 Figure 11 Typical Schmitt Trigger Input Voltage Thresholds vs. V 2001 Consumer Microcircuits Limited Figure 10 ‘C-BUS’ Timing 2.5 3 3.5 4 Vdd 23 Vthi Vtlo 4.5 5 5.5 DD CMX624 D/624/6 ...
Page 24
... V23 / Bell 202 Modem 1.7.2 Packaging Figure 12a 24-pin SOIC (D2) Mechanical Outline: Order as part no. CMX624D2 Figure 12b 24-pin SSOP (D5) Mechanical Outline: Order as part no. CMX624D5 2001 Consumer Microcircuits Limited 24 CMX624 D/624/6 ...
Page 25
... V23 / Bell 202 Modem Figure 12c 24-pin DIL (P4) Mechanical Outline: Order as part no. CMX624P4 Handling precautions: This product includes input protection, however, precautions should be taken to prevent device damage from electro-static discharge. CML does not assume any responsibility for the use of any circuitry described. No IPR or circuit patent licences are implied ...