User's Manual
PCS3_HD_v01.000-03
Confidential / Preliminary
Page 50 of 101
2013-10-21
PCS3 Hardware Interface Description
3.10 Control Signals
3.10.5
Low Current Indicator
A low current indication is optionally available over the LC_IND line. By default, low current in-
dication is disabled.
For the LC_IND signal to work as a low current indicator the feature has to be enabled by AT
command (see [1]: AT^SCFG: MEopMode/PowerMgmt/LCI).
If enabled, the LC_IND signal is high when the module is sleeping. During its sleep the module
will for the most part be slow clocked with 32kHz RTC.
Table 15: Low current indicator line
Signal I/O/P Description
LC_IND
O
Inactive to active high transition:
0 = High current consumption
The module draws its power via BATT+
1 = Low current consumption (only reached during SLEEP mode)
The module draws only a low current via BATT+
LC_IND
1
0
t
I
BATT+
tLC
ILCpk
(typ. 150mA)
ILCmax <100mA
tLCpk<100µs
tLCru>
t
300µs
Figure 23: Low current indication timing
tLC Time for the I
BATT+
current consumption: ILCmax<100mA.
tLCpk Max. time duration for the inrush current peak at the end of the low current period.
tLCru When the LC_IND signal becomes inactive (low) the current ramps up to the
maximum low current value within tLCru.
ILCpk When the module turns from sleep to normal operation some internal supply
voltages will be switched on. That causes a small inrush current peak.
ILCmax During the low current period tLC the current consumption does not exceed
the ILCmax value.