User's Manual

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
WWAN-SSIC 0 Pin No. 21 69 75 1
State NC GND GND GND
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.