EV6040 Datasheet, PDF (10/13 Pages) CML Microcircuits – Evaluation Kit User Manual

Evaluation Kit User Manual for FX604
EV6040
1.6 Detailed Description
1.6.1 Hardware Description - Evaluation Board
1.6.1.1 Line Protection
Line protection is provided by R27 (47Ω), R28 (47Ω), D7 and D8 (both TISP4180 or TISP5180 or
TPA150A12 or TPA150B12). These components are not fitted, but suitable values for UK applications
are suggested in brackets. Wire links which bypass R27 and R28 will need to be cut if these resistors
are fitted.
1.6.1.2 AC or DC Load
An ac or dc load is provided by R30 (827Ω), R36 (1386Ω) and C10 (139nF). These components are
not fitted, but suitable values for UK applications are suggested in brackets. This load is controlled by
relay RLY3. A logic '1' on AC-LOAD (J1 pin 6) connects this load and illuminates the LED.
1.6.1.3 Wetting Pulse
A wetting pulse load is provided by R26, which is not fitted. For UK applications, a suitable value may
be in the region of 240Ω to 350Ω. The wetting pulse is controlled by relay RLY2. A logic '1' on
WETTING PULSE (J1 pin 7) connects the wetting pulse load and illuminates the LED.
1.6.1.4 Transformer and Op-Amp Hybrid
The transformer and op-amp hybrid are connected to the phone jack by relay RLY1. A logic '1' on TX-
LINE (J1 pin 8) connects the transformer to the phone jack and illuminates the LED.
1.6.1.5 Operating Voltage
The selection of operating voltage (VDD = 3.3V or 5.0V) by jumper JP3 affects the choice of
component values around the evaluation device. The following jumpers should be used to select
appropriate component values: JP1, JP4, JP5, JP6 and JP7. All jumpers must be set the same way:
use position 1-2 for VDD = 3.3V and position 2-3 for VDD = 5.0V operation.
1.6.1.6 Clock/Oscillator
The evaluation device may use either an external clock or its own xtal oscillator. A 3.58MHz xtal is
provided on-board for the latter method. Two jumpers JP8, which are normally fitted, select the xtal
oscillator. An external clock may be supplied to JP8_1 (2) once the jumpers have been removed. The
DTMF generator uses its own 3.58MHz xtal because the xtal oscillator is only operational when the
generator is active and the evaluation device has a 'zero-power' mode (in which its xtal oscillator is
disabled) preventing it from supplying a clock to the DTMF generator.
1.6.1.7 Ring/Line Reversal Detection
Ring/line reversal detection is provided by components C3, C4, R1-R4 and D1-D4. The response time
constant is set by components R5 and C5. The evaluation board has been fitted with suitable
components for UK applications. See FX602 data sheet for further details. This function is not used
on the FX604.
1.6.1.8 Parallel Phone Detection
Parallel phone detection is provided by components C17, C19-C23, R25, R29, R34, R35, R50, D20,
D21 and TR4-TR7. It only communicates with a µC control board if jumper JP10 is fitted (however,
this is not possible when a FX604 is used). A >2ms negative-going pulse on TP17 signifies a phone
line voltage drop of ≈ 4.5V; a 1ms negative-going pulse signifies a phone line voltage rise of ≈ 4.5V.
1.6.1.9 IDD Measurement
The evaluation device IDD may be measured by removing jumper JP2 and replacing it with a
multimeter.
© 1996 Consumer Microcircuits Limited
10
UM6040/3