LTE-A Module Series
EM121R-GL Hardware Design
EM121R-GL Hardware Design 52 / 80
Table 25: State of the WAKE_ON_WAN#
Host
Module
WAKE_ON_WAN#
BB
GPIO
23
VCC_IO_HOST
Note:
The voltage level on VCC_IO_HOST depends on the host side due to the open drain in pin 23.
Wake up the host
1 s
H
L
R1
10k
Figure 30: WAKE_ON_WAN# Signal Reference Circuit
4.5.5. DPR
The module provides the DPR pin for body SAR detection. The signal is sent from a host system proximity
sensor to the module to provide an input trigger, which will reduce the output power in radio transmission.
Table 26: Function of the DPR Signal
4.5.6. WLAN_PA_EN*
QLN4650 enables self-protection circuit (integrated inside QLN4650) when WLAN_PA_EN is ON.
⚫
In LTE mode, the default WLAN_PA_EN is set to 0.
⚫
When WLAN_PA_EN = 1, the LNA will be in self-protection mode.
WAKE_ON_WAN# State
Module Operation Status
Output a 1 s low level pulse signal
Call/SMS/Data is incoming (to wake up the host)
Always at high level
Idle/Sleep
DPR Level
Function
High/Floating
Max transmitting power will NOT backoff.
Low
Max transmitting power backoff by
SAR efs file configure.