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 43 of 88
3.9
Configuration Pins
There are 4 configuration pins on the M.2 module to assist the host identifying the presence
of an Add-In card in the socket.
On the M.2 module, pins CONFIG_0..3 are configured as shown in Table 20.
All configuration pins can be read and decoded by the host platform to recognize the
indicated module configuration and host interface supported. On the host side, each of the
CONFIG_0..3 signals needs to be fitted with a pull-up resistor.
Table 20 M.2 Configuration Pins
Signal Name
Description
Pin
Direction
(WWAN)
Voltage
Level
CONFIG_0
This signal is not connected to the WWAN M.2
module.
21
O
-
CONFIG_1
Tied to Ground internally on the WWAN M.2
module.
69
O
0 V
CONFIG_2
Tied to Ground internally on the WWAN M.2
module.
75
O
0 V
CONFIG_3
Tied to Ground internally on the WWAN M.2
module.
1
O
0 V
3.10
Audio Pins (Reserved)
There are 4 signals on the host interface that are reserved to support a digital audio interface.
This is for future development, all existing WWAN M.2 modules do not support audio;
therefore, these signals should be left unconnected at the host to avoid any contention
.
Table 21 Audio Signals (Future development)
Signal Name
Description
Pin
Direction
(WWAN)
Voltage
Level
AUDIO0
PCM Clock (I2S_CLK)
20
IO
1.8 V
AUDIO1
PCM In (I2S_RX)
22
I
1.8 V
