User's Manual

TC65 Hardware Interface Description
Strictly confidential / Draft
s
TC65_HD_V00.450 Page 71 of 96 20.04.2005
Function Signal name IO Signal form and level Comment
Power
indicator
PWR_IND O V
IH
max = 10V
V
OL
max = 0.4V at Imax = 2mA
PWR_IND (Power Indicator)
notifies the module’s on/off
state.
PWR_IND is an open
collector that needs to be
connected to an external pull-
up resistor. Low state of the
open collector indicates that
the module is on. Vice versa,
high level notifies the Power-
down mode.
Therefore, the pin may be
used to enable external
voltage regulators which
supply an external logic for
communication with the
module, e.g. level converters.
Ignition IGT I
R
I
≈ 30kΩ, C
I
≈ 10nF
V
IL
max = 0.8V at Imax = -150µA
V
OH
max = 4.5V (V
BATT+
)
ON
~~~
|____|
~~~
Active Low ≥ 400ms
This signal switches the
mobile on.
This line must be driven low
by an open drain or open
collector driver.
Emergency
reset
EMERG_RST I
R
I
≈ 5kΩ
V
IL
max = 0.2V at Imax = -0.5mA
V
OH
min = 1.75V
V
OH
max = 3.05V
Signal
~~~
|______|
~~~
Pull down ≥ 10ms
Falling edge resets module.
Reset function in case of
emergency: Pull down and
release EMERG_RST. Falling
edge will reset the module.
Data stored in the volatile
memory will be lost. For
orderly software controlled
reset rather use the
AT+CFUN command (e.g.
AT+CFUN=,1).
This line must be driven by
open drain or open collector.
If unused keep pin open.
V
OL
max = 0.3V at I = 0.1mA
V
OH
min = 2.3V at I = -0.1mA
V
OH
max = 0.05V
Synchroni-
zation
SYNC O
n Tx = n x 577µs impulse each 4.616ms,
with ___µs forward time.
There are two alternative
options for using the SYNC
pin:
a) Indicating increased
current consumption during
uplink transmission burst.
Note that the timing of the
signal is different during
handover.
b) Driving a status LED to
indicate different operating
modes of TC65. The LED
must be installed in the host
application.
If unused keep pin open.
RTC backup VDDLP I/O R
I
≈ 1kΩ
V
O
max = 4.5V
V
BATT+
= 4.3V:
V
O
= 3.2V at I
O
= -500µA
V
BATT+
= 0V:
V
I
= 2.7V…4.5V at I
max
= 15µA
If unused keep pin open.