Z0221524ASGR50A5 Zilog, Z0221524ASGR50A5 Datasheet - Page 51

• Manufacturer Part Number: Z0221524ASGR50A5
• Description: IC MODEM CONTROLLER 44-LQFP
• Manufacturer: Zilog

Specifications of Z0221524ASGR50A5

• Data Format: V.21, V.22, V.23, Bell 103, Bell 212A
• Baud Rates: 2.4k
• Interface: Serial
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 44-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Escape Sequences
PS001907-0904
STATIC REVERSE Mode
Alternatively, the user can select the \
ware signal to initiate a line reversal. When
volts) to inactive (logic
the fastest method of executing the line turnaround.
At execution of the
modem reverses (its carrier changes from 390 Hz to 1300 Hz), and waits for a 390
Hz carrier for 440 ms.
•
•
Reverse Turnaround
The modem performs a Reverse turnaround when a carrier drop longer than 20
ms is detected. The
reverses its carrier (from 1300 Hz to 390 Hz) and waits for a 1300 Hz carrier for
220 ms.
•
•
If the modem is in REVERSE mode and receives the R command, it sends the
ERROR
If the command ATR has been executed, the following ATD command forces the
modem to try to connect in REVERSE mode.
An escape sequence is one or more particular characters sent from the terminal to
the modem during the ON-LINE state. This sequence is activated to switch the
If the modem detects more than 40 ms of a 390 Hz carrier within 440 ms, it
sends the
If the modem does not detect more than 40 ms of a 390 Hz carrier within 440
ms, it hangs up and sends the
If the modem detects more than 40 ms of a 1300 Hz carrier within 220 ms, it
sends the
If the modem does not detect more than 40 ms of a 1300 Hz carrier within 220
ms, it reverses again and waits for a 390 Hz carrier for 220 ms.
–
–
code to the Host.
If the modem detects more than 40 ms of a 390 Hz carrier within 220 ms, it
sends the
(there was a short carrier dropout).
If the modem does not detect more than 40 ms of a 390 Hz carrier within
220 ms, it hangs up and sends the
Single Chip Modem with Integrated Controller, Data Pump, and AFE
CONNECT 1200
CONNECT 75
CONNECT 1200
R
Carrier Detect
command, the
1
or +5 volts), the line turnaround executes. This method is
/
1200
/
75
result code to the Host. CD goes active.
/
code to the Host. The CD then goes active.
75
NO CARRIER
Carrier Detect
code to the Host. The
(
R1
CD
) signal goes inactive and the modem
command option and use the
NO CARRIER
RTS
code to the Host.
changes from active (logic
signal (
code to the Host.
CD
CD
then goes active
) goes inactive, the
Escape Sequences
RTS
Z02215
0
hard-
or 0
45