User's Manual

COMPANY CONFIDENTIAL
14
1.4 Platform connection design
1.4.1 Configuration Pins
The M.2 module provides 4 configuration pins. T77H468 is configured as WWAN-SSIC 0,
refer to PCIe M.2_Rev0.7a.
Item Module configuration decodes Module type Port configuration
Config Config_0 Config_1 Config_2 Config_3
Pin No. 21 69 75 1
State NC GND GND GND
WWAN-SSIC 0
1.4.2 Power and ground
(1) Power Rail Parameters
Parameter Min Type Max Units
Operating voltage 3.135 3.3 3.465 Vdc
The operating voltage was defined in PCIe M.2_Rev0.7a standard as 3.3V+/-5%.
(2) 3.135 V is the minimum voltage supplied to LTE M.2 card by the host platform, and VCC
must never be under 3.135 V in any case. As our experiment, if we set the VCC=3.0V, the
M.2 card will power off when M.2 card working at +23dBm continue mode.
(3) Whenever the M.2 module works at 2G mode, the module transmits at the maximum
power (like +33dBm), the transient peak current may reach to 2.5 A.
We recommended design the VCC supply of host as below:
Remark: When the system power restarts, reserve R1 to discharge power.
(4) The LTE M.2 module provides 5 power pins and 11 Ground pins. To ensure that the LTE
module works normally, all the pins must be connected.