UMTS/HSPA+ Module Series
UC200A-GL_Hardware_Design 29 / 78
Module
VBAT_RF
VBAT_BB
VBAT
C1
100 µF
C6
100 nF
C7
33 pF
C8
10 pF
+
+
C2
100 nF
C5
100 µF
C3
33 pF
C4
10 pF
D1
WS4.5D3HV
Figure 8: Star Structure of the Power Supply
3.5. Turn On
3.5.1. Turn on the Module with PWRKEY
Table 9: Pin Definition of PWRKEY
When the module is in power down mode, it can be turned on to normal mode by driving the PWRKEY pin
to a low level for at least 500 ms. It is recommended to use an open drain/collector driver to control the
PWRKEY. A simple reference circuit is illustrated in the following figure.
PWRKEY
4.7K
47K
10 nF
Turn-on pulse
≥
500 ms
Figure 9: Turning on the Module Using Driving Circuit
Pin Name
Pin No.
I/O
Description
Comment
PWRKEY
21
DI
Turn on/off the module
VBAT power domain.
Active low.