User's Manual

M50 Hardware Design
M50_HD_V2.0 - 22 -
73 RESERVED 74 RESERVED
75 RESERVED 76 RESERVED
77 RESERVED 78 RESERVED
79 GND 80 GND
81 GND 82 GND
83 GND
Note: Keep all reserved pins open.
3.1.2. Pin description
Table 6: Pin description
Power supply
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
VBAT 67,
68,
69，
70
I Main power supply
of module:
VBAT=3.3V~4.6V
Vmax= 4.6V
Vmin=3.3V
Vnorm=4.0V
Make sure that
supply sufficient
current in a
transmitting
burst which
typically rises to
1.6A.
VRTC 59 I/O Power supply for
RTC when V B AT is
not supplied for the
system.
Charging for backup
battery or golden
capacitor when the
VBAT is supplied.
VImax=3.3V
VImin=1.5V
VInorm=2.8V
VOmax=2.85V
VOmin=2.6V
VOnorm=2.8V
Iout(max)= 1mA
Iin=2.6~5 uA
If unused, keep
this pin open.
VDD_EXT 60 O Supply 2.8V voltage
for external circuit.
Vmax=2.9V
Vmin=2.7V
Vnorm=2.8V
Imax=20mA
1. If unused,
keep this pin
open.
2. Recommended
to add a
2.2~4.7uF
bypass capacitor
when supplying
power for
external circuit.
GND 37,
61,
Ground
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