UM-B-093
DA1469x PRO Development Kit
User Manual
Revision 1.1
19-Feb-2019
CFR0012
14 of 22
© 2019 Dialog Semiconductor
The Op-Amps also require a small negative supply (-0.232 V) generated by U20 (
Figure 18
).
Figure 18: Negative Supply for Op-Amps
Voltage translation is required because the DA1469x I/O voltage varies depending on the battery
level and setting for the I/OLDO (V30).For example, if the other side (on board interfaces,
JTAG/UART) is fixed at 3.3 V, there is a leakage through the pins if the DA1469x voltage I/Os are at
3.0 V or less.
Table 1: Signals with Level Translation
Pin Name
Signal Name
P0_10
SWDIO
P0_11
SWCLK
P0_9
UTX
P0_8
URX
P1_0
URTS
P0_7
UCTS
TP70
-Vgg
C112
100nF
VDD_3V3_PERF
U20
LM7705
CF+
1
VSS
2
SD
3
VDD
4
CF-
8
VSS
5
VOUT
6
CRES
7
C109
4.7uF
C110 4.7uF
C111
10uF
-Vgg
C113
10uF
LP3
500mA_470 OHM
C114
100nF
