User guide

CM52 Integrators’ Manual
CM52 Integrators’ Manual
WI_DEV_CM52_UGD_001-001
Page 47 of 53
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3.5 System connector IO functionality
Note 1: The application IO can be one of the following listed types:
 I Logic input (no pull up or pull down resistors required).
 IOC Logic open-collector input.
 O Logic output (no pull up or pull down resistors required).
 OOC Logic open-collector output.
 I/O Logic I/O.
The pin direction in this table is referenced from the application’s point of view.
Group Pin
No
Name Application Requirements App
I/O
HW flow control is by default enabled in the phone module.
27 TD (DTMS) Logic output to phone module. The application shall set this
output high upon start-up.
O
30 RD (DFMS) Logic input from phone module. I
28 RTS Logic output to phone module. Pulled down by the phone module
(R > 20k). The application shall set this pin low when ready to
receive data.
O
25 CTS Logic input from phone module. This signal is initially set high,
indicating that the phone module is not ready to receive data. It is
set low when the phone module is ready to receive data.
I
26 DTR Logic output to phone module. This signal is pulled up in the
phone module (R > 20k).
This signal should be set low by the application during a data call.
A low to high transition will terminate the data call.
This signal is asserted by the application when it wishes to open a
communications channel. The phone module then prepares the
modem to be connected to the telephone circuit, and, once
connected, maintains the connection. When DTR is de-asserted,
the phone module is switched to "on-hook" to terminate the
connection.
O
Data
23 VPPFLASH/DC
D
DCD: Logic input from phone module. This signal is set default
high. It goes low indicating that a data call is established,
(CONNECT) received from remote modem. The signal goes high
when data connection is disconnected.
Sent from the phone module (DCE) to the application (DTE) to
indicate that it has received a basic carrier signal from a (remote)
DCE.
VPPFLASH: The application shall not apply a voltage to this pin
unless they intend to use it as VPPFLASH in which case it
becomes a power output.
I/O
19 PCMULD Logic output to phone module. O
20 PCMDLD Logic input from phone module. I
PCM
18 PCMSYNC Logic input from phone module. I