CMX878D1 View Datasheet(PDF) - CML Microsystems Plc
Part Name
Description
MFG CO.
'CMX878D1' PDF : 63 Pages View PDF
Line Powered Modem plus DAA
CMX878
The state of the ICTRL pin is also dependent on the mode of the Regulator and Gyrator as shown in the
following table:
Mode of
Operation
On-hook,
min. current
On-hook,
Regulator ON
Off-hook
Programmed
Line Current
Draw
Regulator
Enabled?
N
Y
Y
Y
Gyrator
Enabled?
N
N
Y
N
DAC
Enabled?
N
N
N
Y
ICTRL
OUTPUT
Vss
Low Z Vss
Hi Z
As
programmed
on the DAC
1.5.12.7 ADC Control Register
ADC Control Register: 8-bit write-only.
C-BUS address $EE
Bit: 7 6 5 4 3 2 1 0
Register Value
The ADC comprises an 8 bit programmable reference voltage, ADC-REF, which is compared with the
voltage at the ADCIN pin. The output of the comparator is available in the Line/Wake Event Register.
The ADC is designed to operate with signals between 0V (Vss) and half supply (AVDD / 2). The external
divider will normally be configured to limit the ADCIN pin signals to within this range.
The ADC-REF voltage is:
( AVDD / 2 ) x ( Register Value / 255 )
All bits of this register are cleared to 0 by a General Reset command. A setting of all 0s will powersave
the ADC circuit and will force the output of the comparator to 1.
The ADC can be used to measure a voltage or detect a drop-out. See Section 1.5.11 for details.
© 2002 Consumer Microcircuits Limited
32
D/878/2
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