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Hard Shutdown Sequence
5.6.1 VIO - 2.75V Supply
LZT 123 7589 R1A
5. SYSTEM CONNECTOR INTERFACE
ON/OFF
VIO
Figure 5.4 Hard Shutdown Sequence
Symbol
Parameters
t
Time to complete
+6'
hardware
shutdown
Application ON/
t
38/6(
OFF pulse width
(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.
VIO provides an output voltage derived from an internal 2.75V regulator.
Its electrical characteristics are shown below.
Parameter
Output Voltage (I
load
Load current
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.
t
PULSE
t
HSD
Conditions
ON/OFF low
until VIO is
disabled
Min.
= 50 mA)
2.70
Min.
Typ
Max
2
-
11
t
10
-
+6'
Typ.
Max.
2.75
2.85
75
Unit
s
s
Units
V
mA
28
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