User guide
AEM10941
User guide
AEM10941
User guide
AEM10941
How to reset the AEM10941 evaluation board:
To reset the board, simply
disconnect the storage device and the optional primary battery
and connect the 6 ”Reset”
connections (working from the rightmost to the left) to a
GND
node (i.e. the negative pin of any connector) in order to
discharge the internal nodes of the system.
3
Functional Tests
This section presents a few simple tests that allow the user
to understand the functional behavior of the AEM10941.
To
avoid damaging the board, follow the procedure found in Sec-
tion 2.1 ”Safety information”.
If a test has to be restarted,
make sure to properly reset the system to obtain reproducible
results.
The following functional tests were made using the following
setup:
- Configuration:
SELMPP[1:0]
= LL,
CFG[2:0]
= HLL,
ENLV
= H,
ENHV
= H
- Storage element: capacitor (4
.
7 mF + CBATT)
- Load: 10 kΩ on
HVOUT
,
LVOUT
floating
-
SRC
: current source (1 mA or 100
µ
A) with voltage com-
pliance (4 V)
Feel free to adapt the setup to match your system as long as
you respect the input and cold-start constraints (see Section
1 ”Introduction” of AEM10941 datasheet).
3.1
Start-up
The following example allows users to observe the behavior of
the AEM10941 in the wake-up mode.
Setup
1. Place the probes on the nodes to be observed.
2. Referring to Figure 1, follow steps 1 to 5 explained in
Section 2.1.
Observations and measurements
-
BATT
: Voltage rises as the power provided by the source
is transferred to the storage element (see Figure 2).
-
SRC
: Regulated at
Vmpp
, which is a voltage equal to the
open-circuit voltage (
Voc
) times the MPP ratio defined
in Table 4.
Vsrc
equals
Voc
during MPP evaluation (see
Figure 3). Note that
Vsrc
must be higher than 380 mV
to coldstart.
-
HLDO
/
LLDO
: Regulated when voltage on
BATT
first
rises above
Vchrdy
(see Figure 2).
-
STATUS[0]
: Asserted when the LDOs are ready to be
enabled (refer to Section 7.2 ”Normal mode” of the
AEM10941 datasheet) (see Figure 2).
-
STATUS[2]
: Asserted each time the AEM10941 per-
forms a MPP evaluation (see Figure 3).
0
5
10
15
20
0
1
2
Vchrdy
Time [s]
V
o
lt
ag
e
[V
]
BATT
STATUS[0]
HLDO
Figure 2:
STATUS[0]
and
HLDO
evolution with
BATT
0
5
10
15
20
0
1
2
3
4
Vmpp
Voc
5s
Time [s]
V
o
lt
ag
e
[V
]
STATUS[2]
SRC
Figure 3:
SRC
and
STATUS[2]
while energy is ex-
tracted from
SRC
(
BATT
under
Vovch
)
7
UG AEM10941 REV1.0
Copyright c
2018 e-peas SA
7
UG AEM10941 REV1.0
Copyright c
2018 e-peas SA
7
UG AEM10941 REV1.0
Copyright c
2018 e-peas SA
