Telit Wireless Solutions LN930-AP - Dynamic Power Reduction

LN930 M.2 Hardware User Guide
1VV0301078 Rev.10 – 2015-11-11
Reproduction forbidden without written authorization from Telit Communications S.p.A. - All Rights Reserved. Page 37 of 88
Table 15
Wake on WWAN Signal
Signal Name
Detailed Description
Pin
Direction
(WWAN)
Voltage
Level
WAKE_WWAN# Used by M.2 module to wake the
host. Active Low, Open Drain output
23 O (OD) 3.0 V
3.4.5
Dynamic Power Reduction
With the arrival of Tablets and Ultrabook™ platforms where the antenna is in the base of the
unit, there is a significant issue passing Specific Absorption rate (SAR) requirements for
certification.
The WWAN M.2 module has the ability to configure RF TX power levels based on
proximity sensor input from the host.
A WWAN M.2 power control API is available to the host to dynamically reduce RF
transmit power levels of the WWAN module based on proximity sensor input from the
host.
The DPR# (Dynamic Power Reduction) signal is available on the host interface to assist in
meeting regulatory SAR (Specific Absorption Rate) requirements for RF exposure. The
signal is provided by a host system proximity sensor to the WWAN module to provide an
input trigger causing a reduction in the radio transmit output power.
In conjunction with the DPR signal, a full power control API is available to the host to
adjust the RF transmit power level of the WWAN module.
DPR pin has a pull-up resistor on the WWAN M.2 module.