S42M Hardware User Guide
1VV0301379 Rev. 4
Page
13
of
48
2018-11-28
4.
APPLICATION INTERFACE
Power Supply
S42M require a power supply with the following characteristics:
Typical: 3,0V
DC
, min.: 1,8V
DC
, max.: 3,6V
DC
, thereby delivering > 25 mA peak
S42M 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 in order 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
.
S42M
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: S42M Example Power Supply with LDO
Содержание BlueMod+S42M
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