Sony Ericsson GM-41 Phase II, Integrator'S Manual

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MANUAL 18(51)
Document number Revision
7/198 17-LXE 108 566 Uen A
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2.3.3.3 HW_SD
HW_SD is a bi-directional signal that provides a method of shutting down the module properly (deregistering, etc.)
without using the serial channel.
Limits
Parameter Symbol Condition
Minimum Nominal Maximum
Units
Input low voltage V
IL
-0.3 0 0.3*VREF
Input high voltage V
IH
0.7*VREF VREF VREF+0.3
Output low voltage V
OL
0.22*VREF
Output high voltage V
OH
0.8*VREF
Volt
Input impedance
inside module
R
IN
Pulled up to
VREF
6
20 34 100 k Ω
Rise / fall time t
r
/ t
f
1.0 us
Table 9: HW_SD Electrical Parameters
2.3.3.4 RI
This output signal from the module is used to indicate to the application if an incoming call or SMS is available. A
falling edge indicates incoming call or message. The signal remains low for a period of time before going high. An
SMS-page only generates one pulse which length is configurable using AT*E2SMSRI, while it generates a 1
second low pulse which is repeated during an incoming call until answered or disconnected by the base-station.
Limits
Parameter Symbol Condition
Minimum Maximum
Units
Output low voltage V
OL
I
L
= 2mA 0 0.22*VREF Volt
Output high voltage V
OH
I
L
= 2mA 0.8*VREF VREF Volt
Load current I
L
Source and sink 2 mA
Rise / fall time t
r
/ t
f
1.0 us
Table 10: RI Electrical Parameters
2.3.3.5 RINGER
The RINGER output signal from the module generates a PWM-ring signal during incoming call. The waveform can
be adjusted by an AT-command.
Limits
Parameter Symbol Condition
Minimum Maximum
Units
Output low voltage V
OL
I
L
= 5mA 0 0.22*VREF Volt
Output high voltage V
OH
I
L
= 5mA 0.8*VREF VREF Volt
Load current I
L
Source and sink 5 mA
Frequency f 4.0 kHz
Rise / fall time t
r
/ t
f
1.0 us
Table 11: RINGER Electrical Parameters
6
Using a 80 μ A current pull-up.