UM-B-114
DA14531 Development Kit Pro Hardware User Manual
User Manual
Revision 1.4
23-Apr-2020
13 of 82
© 2021 Dialog Semiconductor
4.1.1
Power Section
The power circuit of DA14531 PRO-DB is designed to support two generations of PRO-MBs:
●
PRO-MB
: there is no need for the additional circuit. The DCDC power configuration and the
voltage applied to DA14531 SoC are arranged on the PRO-MB (see section
). In this case, SW1
must be always set to BUCK position.
●
In this document the operation with DA14531-00FXDEVKT-P is presented.
U1
DA14531
BUCK
BOOST
Bypass
U2
LDO
1.1V
P
w
r
Sw
SW1
J2
VBAT_Hi
VBAT_Lo
R33
2.
2u
H
2.2u
10u
SW1 set to
BUCK Mode
Not
Mounted
V3
V1
NP
PRO-DB
376-04-x
376-05-x
J1
-m
at
in
g
co
n
n
ec
to
r
o
n
P
C
B
C1
C2
L1
VBAT
Vin
VH-
VL-
Figure 6: DA14531 PRO-DB Power Section
Components:
●
U2:
it is an LDO which generates V
LDO
= 1.1 V. U2 is supplied from V
in
voltage rail and it is
enabled only when SW1 is set for Boost mode. Please notice that the quiescent current of U2 is
measured from the power measurement of PRO-MB. It is disabled for the use with PRO-MB.
●
J2:
it is used for connecting external power measurement equipment. For current measurements
of sub-
μΑ range, users can insert an external equipment. When no external equipment is applied,
jumpers must be applied between 1 and 2 as well as between 4 and 5.
●
L1:
inductor for the DA14531 DCDC converter in Buck or Boost mode of operation.
●
C1:
input capacitor for buck mode and output capacitor for boost mode. As input capacitor this
must be equal to 2.2 µF. As an output capacitor, the effective capacitance must be at least 1
μF.
●
C2:
input capacitor for boost mode and output capacitor for buck mode. For the PRO-
daughterboard, this capacitor is set to 10
μF.
●
SW1:
it is a power switch of three positions. Settings:
○
Setting SW1 to position H (Buck) connects the V
BAT_High
and V
BAT_Low
pins of DA14531 to the
voltage rails V1 and V3 of the PRO-MB
○
Setting SW1 to position B (Bypass) connects both V
BAT_High
and V
BAT_Low
pins of DA14531 to
the voltage rail V3 of the PRO-MB
○
Setting SW1 to position L (Boost) connects the V
BAT_Low
pin of DA14531 to the voltage rail
generated from U2 on the PRO-DB
○
For DA14531-00FXDEVKT-P, SW1 must be set to H position (Buck)
