User manual for APPEB1012 Revision 1.2, Oct 2019
Solar Energy Harvesting Supercapacitor Evaluation Board using a
PMIC with MPPT
© CAP-XX Pty Limited 2019 | Tel +61 2 9420 0690 | www.cap-xx.com
Page
8
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11
Charge Management Configuration
Through 3 configuration pins, CFG[2:0], the user can set a particular operating mode from a range
that covers most application requirements without any additional external components.
The three threshold levels are defined as:
•
Vovch : OverCharge threshold voltage
•
Vchrdy : ChargeReady threshold voltage
•
Vovdis : OverDischarge threshold voltage
Table 3: Usage of CFG[1:0]
Custom mode
When CFG [2:0] is set as low, users can use external resistors to customise their required
threshold voltage ranges, as shown in figure 7.
Figure 7: Resistors that set custom mode
All six configuration resistors shown in Figures 6 and 7, must be installed as follows:
Vovch, Vchrdy and, Vovdis are defined by R2, R3, R5 and R6. If we define the total resistor RT as
(R2 + R3 + R5 + R6)
R2, R3, R5 and R6 are calculated as:
•
1 M < RT < 100 M
•
𝑅
2
=
𝑅𝑇
(
1
−
!
!
!
!"#$%
)
•
𝑅
3
=
𝑅𝑇
(
!
!
!
!"#
!
)
•
𝑅
5
=
𝑅𝑇
(
!
!
!
!"#
!
−
!
!
!
!
!
!"#
)
•
𝑅
6
=
𝑅𝑇
(
!
!
!
!
!
!"#
−
!
!
!
!"#
!
)
Vlv cannot be customised. Vhv, can be customised by R8 and R9. If the total resistor of (R8 + R9)
is RV, R8 and R9 are calculated as:
•
1 M < RV < 40 M
Typical Use
CFG [2:0]
Vovch
Vchrdy
Vovdis
Vhv
Vlv
1
1
1
4.12
3.67
3.60
3.3
1.8
Li-ion battery
1
1
0
4.12
4.05
3.60
3.3
1.8
Solid state battery
1
0
1
4.12
3.67
3.00
2.5
1.8
Li-ion battery / NiMH battery
1
0
0
2.70
2.30
2.20
1.8
1.2
Single cell supercapacitor
0
1
1
4.50
3.67
2.80
2.5
1.8
Dual cell supercapacitor
0
1
0
4.50
3.92
3.60
3.3
1.8
Dual cell supercapacitor
0
0
1
3.63
3.10
2.80
2.5
1.8
LifePo4 battery
0
0
0
Custom mode - Programmable through R2, R3, R5, R6, R8, R9
1.8
Configuration pins
Charge management threshold voltage
LDO output voltage
