Technical data

SYSTEM CONNECTOR INTERFACE
27
LZT 123 8020 R1A
5.6 Turning the Radio Device ON/OFF and the External Power Signal
Turning the Radio Device On
Figure 5.2 On timings and VIO performance
Symbol Parameters Conditions Min. Typ Max Unit
t
0
Reference time
when VCC is
within working
limits
(1)
VCC > 3.2V
ON/OFF = VCC
- - - -
t
ON
Time after t0
when the ON/OFF
pulse can begin
VCC > 3.2V 0 - - ms
t
VIO
Time after start of
ON/OFF pulse
when VIO is
active
VCC > 3.2V - 45.0 - ms
t
PULSE
Application
ON/OFF pulse
width
ON/OFF held low
until detected by
software
400 500 - ms
t
PRST
Internal Power-on
reset signal
initiates software
100 - 200 ms
t
CTS
Time when
software
controlled CTS
signal indicates
module READY
CTS signal
configured for
RS232 hardware
flow control, not
GPIO pin
- 0.35 3.0
(2)
s
(1)
The GM47r5 measures the voltage at VCC during the power-up sequence. It
is important that both VCC and ON/OFF reach a minimum of 3.2V before the
ON/OFF low pulse is initiated.
(2)
In SERVICE mode.