Internal Chgdet; External Pon_H - Wavecom Gx64 Application Note

The signal should be held low for at least t
detect and respond with a power hold signal (PWR_KEEP). The signal can be held low
for an unspecified amount of time but it is not recommended since it prevents the
Wireless CPU from respond to any other power state signal request.
3.2.2

Internal CHGDET

A charge request is initiated on INT_CHGDET when the voltage on CHG_IN is <6.3V,
>3.7V, and is 150mV higher than the voltage level of VCC. This signal is active as
long as a valid CPS is available on CHG_IN.
If the Wireless CPU is in "Power Down"-state when a CPS becomes available, it will
automatically place itself in "Charge Only"-mode. If the Wireless CPU is in "Active"-
mode it will remain there. For more information on charging see the "
Application Note - Charging Interface
3.2.3

External PON_H

This system connector signal is an active high power on signal similar to ON/OFF, but
with the exception that it should be kept active high to keep the Wireless CPU in
"Active"-mode. This signal is weakly pulled down to GND in the Power Management
ASIC by a constant current source.
To power on the Wireless CPU this signal should be tied to VCC. It should remain at
VCC until the Wireless CPU should be powered down. To power down the Wireless
CPU PON_H should be set low or high impedance. This will start the power down
process and place the Wireless CPU in either "Power Down" or "Charge Only"-mode
depending on the internal INT_CHGDET-status.
Table 3: PON_H signal characteristics
Parameter
Gx64 APPLICATION NOTE
Power Management
Page: 14/30
Description
I
IL
Input current
I
IH
V Low level detection limit
IL
V High level detection limit
IH
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time for the Wireless CPU to be able to
Low
"-document.
Input Characteristics
Min.
8
-1
0.8*VCC
GR/GS64 Series
Unit
Avg. Max.
20 60 μA
0 μA
0.2*VCC V
V