EES3 Hardware Interface Description
5.5 Pad Assignment and Signal Description
99
EES3_HD_v01.100b
Page 83 of 118
2009-08-12
Confidential / Released
External
supply
voltage
VEXT
O
Normal mode:
V
O
min = 2.75V
V
O
typ = 2.93V
V
O
max = 3.00V
I
O
max = -50mA
C
load,max,extern
= 1µF
VEXT may be used for applica-
tion circuits, for example to sup-
ply power for an I
2
C.
If unused keep line open.
Not available in Power-down
mode. The external digital logic
must not cause any spikes or
glitches on voltage VEXT.
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 indi-
cates that the module is on.
Vice versa, high level notifies
the Power-down mode.
Therefore, the line may be used
to enable external voltage regu-
lators which supply an external
logic for communication with
the module, e.g. level convert-
ers.
Ignition
IGT
I
Internal pull-up: R
I
30k
, C
I
10nF
V
IL
max = 0.8V at Imax = -150µA
V
OH
max = 4.5V (V
BATT+
)
IGT as ON switch:
~~~
|____|
~~~
Active Low > 400ms
IGT as ON/OFF switch:
ON/OFF
~~~|_____|~~~~~|_____|~~~
> 0.4s | > 2s | > 1s |
The IGT signal switches on the
module. Depending on settings
made with AT^SCFG, parame-
ter “MeShutdown/OnIgnition”, it
may also be used as ON/OFF
switch.
This line must be driven low by
an open drain or open collector
driver.
Table 27:
Signal description
(Continued)
Function
Signal name
IO
Signal form and level
Comment
