Fibocom L850-GL Series User Manual

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FIBOCOM L850-GL Series Hardware Guide Page 26 of 59
Figure 3-4 Circuit for module start-up controlled by AP
3.3.1.2 Start-up Timing Sequence
When power supply is ready, the PMU of module will power on and start initialization process by pulling
high FCPO# signal. After about 10s, module will complete initialization process. The start-up timing is
shown in Figure 3-5:
+3.3V
PERST#
tpr
RESET#
ton 1
Module State
Initialization Activation(AT Command Rea dy)
FCPO#
ton
2
typical 10s
OFF
Figure 3-5 Timing control for start-up
The minimum detection time of PCIe link is about 45ms after PERST# de-asserted.
Note
：
When USB is used as data transfer interface, follow timing above in PERST# connecting with
host, otherwise don’t control PERST# in PERST# floating condition.
Index Min. Recommended
Max.
Comments
t
pr
0ms
-
-
The delay time of power supply rising from 0V up to
3.135V. If power supply always ready, it can be ignored
t
on1
8ms
20ms
-
RESET# should be de-asserted after FCPO#
t
on2
50ms 100ms
-
The time delay of PERST# de-asserted after FCPO#,
PERST# must always be the last to get de-asserted

Fibocom L850-GL Series Specifications

General

Category	GSM/GPRS Modules
Model	L850-GL
Form Factor	M.2
Operating Temperature	-10°C to +55°C
Storage Temperature	-40°C to +85°C
GSM Bands	850/900/1800/1900MHz
GNSS	GPS, GLONASS, BeiDou, Galileo
Interface	USB 2.0, UART, PCM, I2C, GPIO
Operating Voltage	3.135V to 4.4V
LTE FDD	B1, B2, B3, B4, B5, B7, B8, B12, B13, B17, B18, B19, B20, B25, B26, B28, B29, B30, B66
LTE TDD	B38/B39/B40/B41
WCDMA	B1, B2, B4, B5, B8
AT Command Set	3GPP TS 27.007
Certifications	CE, FCC, GCF, PTCRB