Siemens TC65 Hardware Interface Description page 73

TC65 Hardware Interface Description
Strictly confidential / Draft
Function Signal name
Power PWR_IND
indicator
Ignition IGT
Emergency EMERG_RST
reset
Synchroni- SYNC
zation
RTC backup VDDLP
TC65_HD_V00.521
IO Signal form and level
O V max = 10V
IH
V max = 0.4V at Imax = 2mA
OL
I
R ≈ 30kΩ, C ≈ 10nF
I I
V max = 0.8V at Imax = -150µA
IL
V max = 4.5V (V
OH BATT+
~~~ ~~~
Active Low ≥ 400ms
ON |____|
I
R ≈ 5kΩ
I
V max = 0.2V at Imax = -0.5mA
IL
V min = 1.75V
OH
V max = 3.05V
OH
~~~ ~~~
Signal |______|
O V max = 0.3V at I = 0.1mA
OL
V min = 2.3V at I = -0.1mA
OH
V max = 0.05V
OH
n Tx = n x 577µs impulse each 4.616ms,
with ___µs forward time.
I/O R ≈ 1kΩ
I
V max = 4.5V
O
V = 4.3V:
BATT+
V = 3.2V at I = -500µA
O O
V = 0V:
BATT+
V = 2.7V...4.5V at I
I max
Page 73 of 99
Comment
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.
This signal switches the
mobile on.
)
This line must be driven low
by an open drain or open
collector driver.
Reset or turn-off in case of
emergency: Pull down and
release EMERG_RST. Then,
activating IGT for 400ms will
reset TC65. If IGT is not
activated for 400ms, TC65
Pull down ≥ 10ms
switches off.
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.
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.
If unused keep pin open.
= 15µA
s
24.05.2005