Specifications

Part 1 - Universal Socket Connectivity Chapter 1 – Universal Socket Connectivity
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342P) 13
Pin
Signal
Name
In/Out
Description
24
–RESET*
I
Device Reset (with pull-up). The active low RESET input resets the device logic
and returns the configuration of the device to the original factory default values or
"stored values" in the NVRAM. RESET is tied to VCC through a time-constant
circuit for “Power-on-Reset” functionality. The SocketModem is ready to accept
commands after a fixed amount of time (“X” Time) after power-on or reset.
Model Time Constant "X" Time Minimum Reset Pulse*
MTSMC-G2 250 ms 6 seconds 100us
MTSMC-C1 250 ms 3-15 seconds 500us
MTSMC-E1 250 ms 3-15 seconds 500us
MTSMC-H4/H3 250 ms 10 seconds 200us
MTSMC-EV2/EV1 250 ms 10 seconds 200us
MT9234SMI 400 ms 6 seconds 100us
MT5692SMI 250 ms 6 seconds 100us
MT2492SMI 250 ms 6 seconds 100us
MT100SEM-IP 250 ms 6 seconds 100us
MT810SWM-IP 250 ms 6-45 seconds 100us
MTS2BTSMI 250 ms 6 seconds 100us
*The SocketModem device may respond to a shorter reset pulse.
Reset Line Interface for the MT5692SMI. The modem’s reset line employs a 10K
pull up resistor. If an open collector driver is to be used, run that output to the
modem only and use a separate driver for other embedded components. The
modem’s reset signal may also be driven by a circuit that both sinks and sources
current if desired. It is also important to note that these modems do not require an
external reset. They have their own internal reset circuitry and voltage monitor and
will function correctly even if the reset input is open.
Reset GPRS and CDMA (MTSMC-G2 and MTSMC-C1). This signal is used to
force a reset procedure by providing low level during reset of at least 500us. The
signal is considered an emergency reset only. A reset procedure is already driven
by internal hardware during the power-up sequence. If no external reset is
necessary, this input can be left open. If used (emergency reset), it has to be driven
by an open collector or an open drain.
Reset EDGE with pull-up (MTSMC-E1). The active low RESET input resets the
device logic and returns the configuration of the device to the original factory default
values of "stored values" in the NVRAM. The SocketModem is ready to accept
commands after a fixed amount of time after power-on or reset.
Reset for MT810SWM-IP. It can take up to 45 seconds before the MT810SWM-IP
is ready to accept AT Commands. When configuring the MT810SWM-IP using
security mode WPA or WPA2, the bootup will take longer.
25
USB_VBUS
I
USB Voltage Sense. Senses the voltage level of the USB to determine if the bus is
available.
26
GND
GND
Logic Ground.
27
USB_DP
I/O
USB Data Positive. Positive pin of the USB data pair.
28
USB_DN
I/O
USB Data Negative. Negative pin of the USB data pair.
29
LED DCD
O
DCD (Active High). Output from 74LCX14 with a 1000 Ohms resistor in series.
SocketWireless Bluetooth (MTS2BTSMI): When lit, indicates a connection. No
series resistor.
30
LED RX
O
RX (Active High). Output from 74LCX14 with a 1000 Ohms resistor in series.
SocketWireless Bluetooth (MTS2BTSMI):
No series resistor.
31
LED DTR
O
DTR (Active High). Output from 74LCX14 with a 1000 Ohms resistor in series.
SocketWireless Bluetooth (MTS2BTSMI): No series resistor.
32
LED TX O
TX (Active High). Output from 74LCX14 with a 1000 Ohms resistor in series.
SocketWireless Bluetooth (MTS2BTSMI): No series resistor.
33
RTS
I
Request to Send (Active Low).RTS is controlled by the DTE to indicate whether
or not the DTE is ready to receive data. RTS ON (low) indicates that the DTE is
ready to receive data from the modem on RXD. RTS OFF indicates to the
SocketModem that it should not transfer data on the RXD.
Note: When the RTS pin is not in use, it should be tied low.
* RESET – A Design Consideration: Allowing the host processor to control the RESET line of the SocketModem provides
the benefit of allowing the host to reset the device in the event of a failure to respond normally. Resetting the SocketModem
will return it to a known functional state.