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AC75 Hardware Interface Description
Strictly confidential / Preliminary
Function
Signal name
Synchroni-
SYNC
zation
RTC backup
VDDLP
ASC0
RXD0
Serial
TXD0
interface
CTS0
RTS0
DTR0
DCD0
DSR0
RING0
ASC1
RXD1
Serial
TXD1
interface
CTS1
RTS1
AC75_HD_V00.202
IO Signal form and level
O
V
max = 0.3V at I = 0.1mA
OL
V
min = 2.3V at I = -0.1mA
OH
V
max = 3.05V
OH
n Tx = n x 577µs impulse each 4.616ms,
with 180µs 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
O
V
max = 0.2V at I = 2mA
OL
V
min = 2.55V at I = -0.5mA
I
OH
V
max = 3.05V
OH
O
I
V
max = 0.8V
IL
I
V
min = 2.15V
IH
O
V
max = VEXTmin + 0.3V = 3.05V
IH
O
Internal pull-down at TXD0: R
O
Internal pull-down at RTS0: R
O
V
max = 0.2V at I = 2mA
OL
V
min = 2.55V at I = -0.5mA
I
OH
V
max = 3.05V
OH
O
I
V
max = 0.8V
IL
V
min = 2.15V
IH
V
max = VEXTmin + 0.3V = 3.05V
IH
Internal pull-down at TXD1: R
Internal pull-down at RTS1: R
Page 89 of 120
Comment
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 AC75. The LED
must be installed in the host
application.
To select a) or b) use the
AT^SSYNC command.
If unused keep pin open.
If unused keep pin open.
= 15µA
Serial interface for AT
commands or data stream.
If lines are unused keep pins
open.
=330kΩ
I
=330kΩ
I
4-wire serial interface for AT
commands or data stream.
If lines are unused keep pins
open.
=330kΩ
I
=330kΩ
I
s
27.04.2006
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