BGS3 Hardware Interface Description
5.5 Pad Assignment and Signal Description
90
BGS3_HD_v01.000d
Page 77 of 109
2010-03-26
Confidential / Released
ASC1
Serial
interface
RXD1
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 TXD1:
R
I
=330k
Internal pull-down at RTS1:
R
I
=330k
4-wire serial interface for AT
commands or data stream.
If unused keep lines open.
TXD1
I
CTS1
O
RTS1
I
SIM
interface
specified
for use
with 3V
SIM card
CCIN
I
R
I
100k
V
IL
max = 0.6V at I = -25µA
V
IH
min = 2.1V at I = -10µA
V
O
max = 3.05V
CCIN = Low, SIM card holder
closed
Maximum cable length or cop-
per track 100mm to SIM card
holder.
All signals of SIM interface are
protected against ESD with a
special diode array.
Usage of CCGND is manda-
tory.
CCRST
O
R
O
47
V
OL
max = 0.25V at I = +1mA
V
OH
min = 2.5V at I = -0.5mA
V
OH
max = 2.95V
CCIO
I/O R
I
4.7k
V
IL
max = 0.75V
V
IL
min = -0.3V
V
IH
min = 2.1V
V
IH
max = CC 0.3V=
3.05V
R
O
100
V
OL
max = 0.3V at I = +1mA
V
OH
min = 2.5V at I = -0.5mA
V
OH
max = 2.95V
CCCLK
O
R
O
100
V
OL
max = 0.3V at I = +1mA
V
OH
min = 2.5V at I = -0.5mA
V
OH
max = 2.95V
CCVCC
O
V
O
min = 2.75V
V
O
typ = 2.85V
V
O
max = 2.95V
I
O
max = -20mA
CCGND
Ground
Table 27:
Signal description
(Continued)
Function
Signal name
IO
Signal form and level
Comment
