Service manual

FO-IS125N
5 – 20
5) Modem circuit (BLOCK E)
The control of the FAX communication by IC1000 (CX95110).
The detection of CI signal, and the line monitor signal is mode.
(Example: Fax signal send)
CX20548 LSD GPIO DC Electrical Characteristics
TXO
SURGE
PROTECTION
DIODE
BRIDGE
Line Side
Device
CX20548-11Z
Digital
Isolation
Barrier
(DIB)
ACTIVE
CHOKE
TEL.LIN
HANDSET
SPEAKER OUT
Host Side Device
CX95110
Line Side
Device
CX20548-12Z
RAC
TAC
RXI
EIO
AGND_LSD
AGND_LSD
AGND_LSD
TAC
EIO
ADG
TELLINEMUTE
SPMUTE
TELMUTE
HANDSET
MIC IN
SDIB_N
SDIB_P
PDIB_N
PDIB_P
DELSIG
BZOUT
SPEAKER
Speaker
Amp
SDAA_PWM
L.P.F.
Gain
L.P.F.
Fax Engine
Controller
CX95410
CI
CIRCUIT
MODEM
BLOCK E
BLOCK A
BLOCK B
BLOCK C
BLOCK D
Analog
TX/RX
TX
RX
Digital
Fig. 7
Parameter Symbol Min. Typ. Max. Units Test Conditions
Input Voltage V
IN
-0.30 - 3.465 V DVDD = +3.465V
Input Voltage Low V
IL
--1.0V
Input Voltage High V
IH
1.6 - - V
Output Voltage Low V
OL
0 - 0.33 V
Output Voltage High V
OH
2.97 - - V
Input Leakage Current - -10 - 10 µA
Output Leakage Current (High Impedance) - -10 - 10 µA
GPIO Output Sink Current at 0.33 V maximum - 2.4 - - mA
GPIO Output Source Current at 2.97 V minimum - 2.4 - - mA
GPIO Rise Time/Fall Time 20 100 ns
Test Conditions unless otherwise stated: DVDD = +3.3V +5%; TA = 0°C to 70°C; external load = 50 pF