User's Manual

Doc No： Topic：
User Manual of TomTom HD
Traffic Receiver Module 1 US
Ver：
1.1
Page：
9 / 39
Page 9 of 39
Input high level 1.6 V 3.3 V
Input low level 0 V 0.4 V
Output high level 1.65 V 2.2 V
Output low level 0 V 0.35 V
2.7 Reset signal
RESET signal is used to reset the HD Traffic Receiver Module 1 US . Whenever this signal is
pulled low, the module is reset. When the device is reset it stops any operation and after the
release of the reset it is unconditionally rebooted, without doing any detach operation from the
network where it is registered. This behavior is not like a proper shut down because any GSM
device is requested to issue a detach request on turn off. For this reason the Reset signal
must not be used to normally shutting down the device, but only as an emergency exit in the
rare case the device remains stuck waiting for some network response.
The RESET is internally controlled on start-up to achieve always a proper power-on reset
sequence, so there's no need to control this pin on start-up. It may only be used to reset a
device already on that is not responding to any command.
Reset Signal Operating levels:
Signal Min Max
RESET Input high 2.2 V* 3.3 V
RESET Input low 0 V 0.2 V
* This signal is internally pulled up so the pin can be left floating if not used
If unused, this signal may be left unconnected. If used, then it must always be connected
with an open collector transistor, to allow the internal circuitry the power on reset and under
voltage lockout functions.
2.8 2.75V_out power output
A regulated power supply output is provided in order to supply small devices from module. This
output is active when the module is ON and goes off when module is shut down. The operating
range characteristics of the supply are:
Operating Range –2.75V_out power supply
Min Typical Max