DSB75 Development Support Board Rev. B1 Hardware Description
Confidential / Released
DSB75_hd_v12
Page 58 of 96
2008-08-26
3.14 Power Supply Interfaces
The constant voltage supply on the PCB provides all the supply voltages required for
operating DSB75 and the GSM module. The power supply source can be a 9V…15V
laboratory PSU or mains adapter and, in addition, an external battery used to feed only the
GSM module.
The DSB75 has three power supply interfaces:
•
Interface X400/X401 – connects to a laboratory PSU for supplying the DSB75 itself and
the connected GSM module. See section 3.14.2.
•
Interface X602 (screw terminal block) - connects to an external battery for supplying only
the GSM module, while DSB75 is powered from the laboratory PSU. See section 3.14.3.
•
Interface X700 or X701 (Lumberg connector) – input for charging the battery. See
The S601 toggle switch selects whether to feed the GSM module from the laboratory PSU or
a battery. If no battery is connected the S601 switch must be flipped down to supply voltage
(BATT+) for the GSM module. Vice versa, if a battery is present, it must be flipped up.
Figure 32 shows the simplified power supply interfaces schematic. Figure 33 shows the
placement of the power supply connectors, switches, jumpers and the pin location.
3V3_4V5
DC
DC
5.0V
Battery
+
-
9-15V
+
-
red
black
X400
X401
X602
X701
2
1
adj.
regulator
Charging
circuit
S601
3
1
6
4 S601
VBAT
PWR_IND
BATT+
VCHARGE
CHARGEGATE
ISENSE
VSENSE
BATTEMP
4,5
3
1,2
B2B
X100
78
41-45
34
14
67
27
V60x, N600
PSU
X710
X405
35
PWR_IND
N400
N410
LDO
N411
LDO
N412
PWR_IND
EN
VDD (2.9V)
3V0
V200
5V0
5V0
Charger
5.0V-8V
+
-
X700
1
3
SD
33
VDDLP
100µF
+
Figure 32: Power supply interfaces
