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CH2165 Datasheet PDF : 18 Pages
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Cermetek Microelectronics, Inc.
High Speed Internet Modem Family
Table 3. iModem Family Pin Description.
PIN NAME I/O
FUNCTION
Directly connects to the telephone line’s Ring lead through a user supplied RJ-11C jack.
1 RING I/O
Directly connects to the telephone line’s TIP lead through a user supplied RJ-11C jack.
2
TIP I/O
NO CONECTION
3
NC ---
NO CONECTION
4
NC ---
SPEAKER. Audio output for speaker. See speaker control diagram.
5 SPK O
SEND EMAIL. Active Low. A low pulse will send an email. The modem will go off hook,
6 SEND I dialup an ISP, send the email and hang up. The SEND pin must be tied high when not in
use. Pulse should be 50msec minimum.
Input. TTL High or Low input pin. The logic level of this input pin is reported in the email
7
IN 1
I message.
EMAIL SENT. Active Low. A low pulse is output on this pin to indicate that an email sent
8 SENT O by the iModem has been accepted by its ISP. The pulse is low for 50ms minimum. See
figure 8.
Input. TTL High or Low input pin. The logic level of this input pin is reported in the email
9
IN 2
I message.
10 TXD
TRANSMIT DATA. Serial transmit data input. Marking, or a binary 1 condition is indicated
I by a HIGH.
11 RXD
RECEIVE DATA. Serial Receive data output. Received marking or a binary 1 condition is
O indicated by a HIGH.
NO CONECTION
12 NC ---
DATA TERMINAL READY INPUT. Active LOW. Switching off DTR can either return
13 DTR
I modem to command state, disconnect phone call, or reset modem. DTR should be set
LOW when not in use.
DATA SET READY. LOW indicates handshaking with a remote modem in progress,
14 DSR O and/or the data carrier of a remote modem has been detected.
15
RI
RING INDICATION. This signal follows the frequency of the ringing signal and is normally
O about 20 to 40 Hz for 2 seconds on with 4 second off.
16 CTS
CLEAR-TO-SEND. Output always LOW. Reserved for flow controls with FAX option. Not
O active, let float.
17 DCD
DATA CARRIER DETECT. LOW indicates a data carrier from a remote modem has been
O detected. Must enable with AT&C1 Hayes command.
NO CONECTION
18 NC ---
DC SUPPLY. 5V ± 5% required.
19 VCC ---
GROUND. Note: Noise should be less than 25mV peak to peak.
20 GND ---
RESET. Active HIGH. This input must be asserted HIGH for at least 10ms to reset the
21 RST
I modem. RESET is then returned to LOW for normal operation. If no system reset is
available, let this pin float to enable internal reset.
REQUEST TO SEND. Active Low. Used for flow control. Should be tied Low when using
22 RTS
I SEND pin and when using @T commands for CH2160 only. DO NOT CONNECT for
CH2124.
2003 Cermetek Microelectronics, Inc.
Page 12
Document No. 607-0017 Revision H2 (11/03)
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