Specifications

AC65/AC75 Hardware Interface Description
5.5 Pin Assignment and Signal Description
s
AC65_AC75_HD_v01.002 Page 83 of 117 2006-10-30
Confidential / Released
Synchroni-
zation
SYNC O V
OL
max = 0.3V at I = 0.1mA
V
OH
min = 2.3V at I = -0.1mA
V
OH
max = 3.05V
n Tx = n x 577µs impulse each
4.616ms, with 180µs forward time.
There are two alternative options
for using the SYNC pin:
a) Indicating increased current
consumption during uplink trans-
mission burst. Note that the timing
of the signal is different during
handover.
b) Driving a status LED to indicate
different operating modes of
AC65/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.
RTC
backup
VDDLP I/O R
I
≈ 1kΩ
V
O
max = 4.5V
V
BATT+
= 4.3V:
V
O
= 3.2V at I
O
= -500µA
V
BATT+
= 0V:
VI = 2.4V…4.5V at Imax = 25µA
If unused keep pin 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 = 3.05V
V
IL
max = 0.8V
V
IH
min = 2.15V
V
IH
max = VEXTmin + 0.3V = 3.05V
Internal pull-down at TXD0: R
I
=330k
Ω
Internal pull-down at RTS0: R
I
=330k
Ω
Serial interface for AT commands
or data stream.
If lines are unused keep pins open.
TXD0 I
CTS0 O
RTS0 I
DTR0 I
DCD0 O
DSR0 O
RING0 O
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 = 3.05V
V
IL
max = 0.8V
V
IH
min = 2.15V
V
IH
max = VEXTmin + 0.3V = 3.05V
Internal pull-down at TXD1: R
I
=330k
Ω
Internal pull-down at RTS1: R
I
=330k
Ω
4-wire serial interface for AT com-
mands or data stream.
If lines are unused keep pins open.
TXD1 I
CTS1 O
RTS1 I
Table 26: Signal description
Function Signal name IO Signal form and level Comment