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2.4.2.1
Wakeup-Inrush Current
The wakeup inrush current occurs when the MODULE_PWR_EN_B signal transitions
from High to Low. The wakeup-inrush event occurs on the VCC_MAIN supply input and
not the VCC_AUX supply. The magnitude of the inrush is dependent on power supply
output impedance.
2.4.2.2
Contact-Inrush Current
The contact inrush current simulates application of power to the VCC_MAIN input lines
and measures the impact of the input impedance of the module.
While holding the MODULE_PWR_EN_B signal HIGH, a direct contact of VCC_MAIN
input pins to the output of the corresponding VCC_MAIN power supply is made and the
peak current measured. Similarly the contact inrush current of the VCC_AUX lines was
measured by making a direct contact of VCC_AUX pins to the output of the
corresponding VCC_AUX power supply.
2.4.2.3
Power Down Mode (Minimum DC Power Consumption)
In power down mode the module is placed in a low power consumption state under
control of the host application. In this mode, the unit consumes approximately 1 uA of
current as measured from the VCC_MAIN supply input and 1 uA of current as
measured from the VCC_AUX supply input. To activate this mode, the
Module_PWR_EN_B signal on pin 12 of the system connector is pulled to a logic level
1, which puts the module into the low power state. The module will stay in the low
power state until the Module_PWR_EN_B signal is driven low by an external open
collector transistor in the application circuitry. Turning the external open collector
transistor off will cause the Module_PWR_EN_B signal to float high and turn the module
off. The Module_PWR_EN_B line is tied to VCC_MAIN through a 220k pull-up
resistor so the sink current in the external open collector transistor is minimal.
2.4.3
VREF Signal Details
The following table defines the current sourcing capabilities and behavior of the VREF
signal.
Supply Voltage Reference
Output Current
Application Load
Rise Time
Fall Time
Confidential
USERS MANUAL
Document number
4/198 17-LXE 108 566 Uen
Parameter
Table 9: VREF Supply Details
Min
Typical
2.45
2.9
10
100
17(42)
Revision
PA7
Max
Units
3.1
V
µ A
1000
K
µ s
3300
0.8
ms
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