Siemens XT65, Обзор аппаратуры, Страница: 36 / 58

XT65/XT75 Hardware Interface Overview
6.5 Pin Assignment and Signal Description
s
XT65_XT75_HO_v00.130 Page 36 of 67 2006-10-12
Confidential / Preliminary
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 = 3.05V
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
XT65/XT75. 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
≈ 1k Ω
V
O
max = 4.5V
V
BATT+
= 4.2V:
V
O
= 3.3V 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 = V 0.3V = 3.05V
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
Table 17:
Signal description
Function Signal name IO Signal form and level Comment