Sony Ericsson GR47/GR48 - Manual (Page 28)

5. SYSTEM CONNECTOR INTERFACE
28
LZT 123 7589 R1A
Hard Shutdown Sequence
Figure 5.4 Hard Shutdown Sequence
(4) To implement the Hard Shutdown of the GR47, the ON/OFF pulse must
be held low until the sequence is complete. Ensure that ON/OFF is not
released before VIO has been deactivated by the module.
5.6.1 VIO - 2.75V Supply
VIO provides an output voltage derived from an internal 2.75V regulator.
Its electrical characteristics are shown below.
You can use this output for the following:
• to indicate that the radio device is powered;
• to power interface circuits, external to the radio device.
ON/OFF
VIO
t
HSD
t
PULSE
Symbol Parameters Conditions Min. Typ Max Unit
t
+6'
Time to complete
hardware
shutdown
2 - 11 s
t
38/6(
 Application ON/
OFF pulse width
ON/OFF low
until VIO is
disabled
t
+6'
10 - s
Parameter Min. Typ. Max. Units
Output Voltage (I
load
= 50 mA) 2.70 2.75 2.85 V
Load current 75 mA