6
2.
Power
2.1.
Power Supply
The host provides power to the EM919
1
through multiple power and ground pins as summarized
in
Table 2-1
.
The host must provide safe and continuous power (via battery or a regulated power supply) at all
times; the module does not have an independent power supply, or protection circuits to guard against
electrical issues.
Table 2-1
Power and Ground Specifications
Name
Pins
Specification
Min
Typ
Max
Units
VCC
(3.3V)
2, 4, 24, 38, 68, 70, 72, 74
Voltage range
3.135
3.3
4.4
V
Ripple voltage
-
-
100
mV
pp
Peak Current
-
-
4000
mA
Continuous
Current
-
TBD
-
mA
GND
3, 5, 11, 27, 33, 39, 45, 51, 57, 71, 73
-
0
-
V
2.2.
Module Power States
The module has five power states, as described in
Table 2-2
.
Table 2-2
Module Power States
State
Details
H
o
st
Is
P
o
w
er
e
d
H
o
st
In
ter
fac
e
A
ct
ive
RF
E
n
ab
led
Normal (Default
State)
Module is active
Default state. Occurs when VCC is first applied,
Full_Card_Power_Off# is deasserted (pulled high), and
W_DISABLE# is deasserted
Module is capable of placing/receiving calls, or establishing data
connections on the wireless network
Current consumption is affected by several factors, including:
Radio band being used
Transmit power
Receive gain settings
Data rate
August
2
2
, 202
2
