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AC75 Hardware Interface Description
Strictly confidential / Preliminary
Function
Signal name
Power
PWR_IND
indicator
Ignition
IGT
Emergency
EMERG_RST
reset
Power-on
reset
AC75_HD_V00.202
IO Signal form and level
O
V
max = 10V
IH
V
max = 0.4V at Imax = 2mA
OL
I
Internal pull-up: R
≈ 30kΩ, C
I
V
max = 0.8V at Imax = -150µA
IL
V
max = 4.5V (V
OH
BATT+
~~~
~~~
Active Low ≥ 400ms
ON
|____|
I
Internal pull-up: R
≈ 5kΩ
I
V
max = 0.2V at Imax = -0.5mA
IL
V
min = 1.75V
OH
V
max = 3.05V
OH
~~~
~~~
Signal
|______|
O
Internal pull-up: R
≈ 5kΩ
I
V
max = 0.2V at I = 2mA
OL
V
min = 1.75V
OH
V
max = 3.05V
OH
Reset signal driven by the module:
VEXT
EMRG_RST
(see also Figure 5 and Figure 6)
Page 88 of 120
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
≈ 10nF
I
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 AC75. If IGT is not
activated for 400ms, AC75
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=x,1).
This line must be driven by
open drain or open collector.
If unused keep pin open.
Reset signal driven by the
module which can be used to
reset any application or
device connected to the
module. Only effective for
120ms during the assertion of
IGT when the module is about
to start.
appr. 120ms
s
27.04.2006
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