Siemens XT75 Specifikace stáhnout pdf (Strana 36)

XT65/XT75 Hardware Interface Overview

6.5 Pin Assignment and Signal Description

XT65_XT75_HO_v00.130 Page 36 of 67 2006-10-12

Confidential / Preliminary

Syn-

chroni-

zation

SYNC O V

max = 0.3V at I = 0.1mA

min = 2.3V at I = -0.1mA

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

≈ 1kΩ

max = 4.5V

BATT+

= 4.2V:

= 3.3V at I

= -500µA

BATT+

= 0V:

VI = 2.4V…4.5V at Imax = 25µA

If unused keep pin open.

ASC0

Serial

interface

RXD0 O V

max = 0.2V at I = 2mA

min = 2.55V at I = -0.5mA

max = 3.05V

max = 0.8V

min = 2.15V

max = VEXTmin + 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

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 57 58

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