BGS3 Hardware Interface Description
5.5 Pad Assignment and Signal Description
90
BGS3_HD_v01.000d
Page 76 of 109
2010-03-26
Confidential / Released
Emer-
gency
reset
EMERG_OFF I
Internal pull-up: R
I
10k
V
IL
max = 0.3V at Imax = -140
A
V
OH
min = 1.70V
V
OH
max = 1.90V
Signal
~~
|___|
~~
Active Low >10ms
Turn-off in case of emergency:
Pull down and release
EMERG_OFF.Falling edge
turns off the module.
Data stored in the volatile mem-
ory will be lost. For orderly soft-
ware 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 line open.
Power-on
reset
O
Internal pull-up: R
I
5k
V
OL
max = 0.2V at I = 2mA
V
OH
min = 1.75V
V
OH
max = 3.00V
Reset signal driven by the module:
(see also
and
Reset signal driven by the mod-
ule which can be used to reset
any application or device con-
nected to the module. Only
effective for approximately
220ms during the assertion of
IGT when the module is about
to start.
Syn-
chroni-
zation
SYNC
O
V
OL
max = 0.3V at I = 0.1mA
V
OH
min = 2.3V at I = -0.1mA
V
OH
max = 3.00V
n Tx = n x 577µs impulse each
4.616ms, with 180µs forward time.
There are two alternative
options for using the SYNC line:
a) Indicating increased current
consumption during uplink
transmission burst. Note that
the timing of the signal is differ-
ent during handover.
b) Driving a status LED to indi-
cate different operating modes
of BGS3. The LED must be
installed in the host application.
To select a) or b) use the
AT^SSYNC command.
If unused keep line open.
ASC0
Serial
interface
RXD0
O
V
OL
max = 0.2V at I = 2mA
V
OH
min = 2.55V at I = -0.5mA
V
OH
max = 3.00V
V
IL
max = 0.8V
V
IH
min = 2.15V
V
IH
max = V 0.3V = 3.05V
Internal pull-down at TXD0:
R
I
=330k
Internal pull-down at RTS0:
R
I
=330k
Serial interface for AT com-
mands or data stream.
If unused keep lines open.
TXD0
I
CTS0
O
RTS0
I
DTR0
I
DCD0
O
DSR0
O
RING0
O
Table 27:
Signal description
(Continued)
Function
Signal name
IO
Signal form and level
Comment
