Specifications

COMPANY CONFIDENTIAL
15
pulled up at the host side. When the WWAN needs to wake up the host, it will output a one
second low pulse, shown in Figure 1-4.
Typical Connection in Platform/System
1.
5.8 DPR (Dynamic Power Reduction)
The optional DPR signal is used by wireless devices t
o assist in meeting regulatory SAR
(Specific Absorption Rate) requirements for RF exposure. The signal is provided by a host
system proximity sensor to the wireless device to provide an input trigger causing a reduction
in the radio transmit output power.
The required value of the power reduction will vary between different host systems and is left
to the host platform OEM and card vendor to determine, along with the specific
implementation details. The assertion and de-assertion of DPR is asynchronous to any
system clock. All transients resulting from the proximity sensor need to be de-bounced by
system circuitry.
(1) State of the DPR
Item State Definition
1 Low Enable the SAR power back off.
2 High Disable the SAR power back off, internally pull up
Note: DPR is connected to configurable GPIO pin from PMIC, which can support either 3.3V
VIO or 1.8V VIO. The default configuration is 1.8V VIO with interrupt function (low active)
(2) Typical Connection in Platform/System