S50 Hardware User Guide
1VV0301505 Rev. 3
Page 13 of 60
2021-05-05
Not Subject to NDA
4.
APPLICATION INTERFACE
4.1.
Power Supply
S50 require a power supply with the following characteristics:
Typical: 3,0V
DC
, min.: 1,7V
DC
, max.: 3,6V
DC
, thereby delivering > 25 mA peak
S50 is designed to be powered from 3V coin cell batteries e.g. CR2032 directly,
or any other power source complying with the given requirements. For optimal
performance, a stable supply is recommended. Furthermore, it is recommended to place
a capacitor in parallel to the CR2032 3V coin cell battery to prolong battery lifetime, by
compensating the effects of the rising source resistance of the battery to pulsed loads.
Since the isolation resistance of this capacitor will discharge the battery in a not
insignificant scale, the capacitor should be chosen under consideration of the following
rules:
•
Capacitance as small as necessary
•
Nominal voltage as high as possible
•
Case size as large as possible
•
Use X7R instead of X5R
.
S50
XC6209F-3.3
E-6,F-6
VSUP
GND:
A-7,E-7,F-7,B-[5:8],
C-[5:8],D-8,E-8,F-8
1µ + 100n
1µ
VOUT
VSS
VIN
CE
5
1
3
2
+5VDC
Figure 3: S50 Example Power Supply with LDO
