Specifications

Product Technical Specification & Customer Design Guidelines
Interfaces
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prior written agreement.
WA_DEV_Q64_PTS_001-003 January 9, 2009
3.14 ON / OFF Signal
This input is used to switch ON or OFF the Wireless CPU
®
.
A low level signal must be provided on the pin ON/OFF to switch ON the Wireless
CPU
®
. The voltage of this signal must be maintained at low level during a minimum of
1500ms. This signal can be left at high level until switched off.
To power OFF the Wireless CPU
®
, the steps depends on whether the Q64 has GR
plug-in embedded.
• If the Wireless CPU
®
has GR plug-in, the pin ON/OFF must also be maintained
at low level during a minimum of 500ms and then set it back to high level. The
Wireless CPU
®
can be switched off through the GR plug-in and the Operating
System.
• If there is no GR plug-in in the Wireless CPU
®
, the ON/OFF pin must be
maintained at high level. The Wireless CPU
®
can be switched off through the
Operating System.
• Please refer to section 3.14.3.2 for further information of Power-OFF sequence.
Warning:
All external signals must be inactive when the CPU
®
is OFF to avoid any damage
when starting and allow Wireless CPU
®
to start and stop correctly.
3.14.1 Features
Electrical characteristics of the signal
Signal Parameter Minimum Maximum Unit
V
IL
0.5 V ON/OFF
V
IH
1.5 VCC V
3.14.2 Pin Description
Signal Pin number I/O Impedance Description
ON/OFF 14 I 10 kΩ* Q64 Power-ON
*Remark: The ON/OFF pin is connected to a PNP transistor before going into the Q64
baseband network and WMP100, shown in
Figure 29.