User's Manual

1323x Remote Extender Motherboard
1323x Development Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor 5-5
Figure 5-2. 1323x-REM Block Diagram
5.2.1 Power Management
The 1323x-REM can be powered from two AA batteries, the USB connector 5 V supply, or an external
DC supply and is also intended to power the 1323x-MRB. Figure 5-3 shows the power management
circuit.
Figure 5-3. 1323x-REM Power Management Circuit
A boost-buck voltage regulator U8 is used in this design to allow operation over a relatively wide, low
voltage input range, i.e., the TPS63001 regulator has input voltage range from 1.8 V to 5.5V. This allows
a broad range of power supply sources. The regulated output voltage of the TPS63001 is 3.3 V which
delivers about 3.05 V to the board due to the drop across the isolation Schottky diodes.
Attributes of the power management circuit include:
• Switch SL1 provides an ON/OFF function for all input voltage sources
• Red LED5 provides a POWER-ON indicator for all sources
• The 1323x-REM can derive power from three different sources -
1. USB port Type-B connector J15 - power can be supplied from an actual USB port connection
or from an AC to DC converter that uses the USB connector to supply power.
2. External DC source via header J14 - a standard 0.1 in. spacing 1x2 pin header allows for
connection of an external DC supply.
1323x-MRB
GPIO Header
Receptacles
IR
Receiver
(38 kHz)
VCC
USB
2.0
4 Blue
Indicator
LEDs
USB
Type-B
Conn
On/Off
Switch
USB <> UART
Serial IC
8 Switch
Matrix
Power
Management
GPIO
Pin Headers
On
LED
External DC
2 AA
Battery
IR
D8
MBR 0 520L T1 G
D10
MBR0520LT1G
D11
MBR 05 20LT 1G
D12
MBR0520LT1G
D13
MBR0520LT1G
21
LED 5
RE D
POWER ON
R39
330
V_LED
V_ MRB
V_ LE D
V_DC
V_I RX
C32
10UF
EN
6
GN D
9
L1
4
L2
2
PS/SY NC
7
VOUT
1
VIN
5
VINA
8
FB
10
PGND
3
PPAD
11
U8
T PS6 3001
1 2
L3 3.3uH
V_BAT
R38
4. 7 K
1
32
Q4
S I 23 05
R41
10K
TP27
V_USB VC C
TP21
TP 25 TP24
C33
0.1UF
R45
0
C43
10UF
R43
0
TP 2 3
C42
10 U F
R35
0
R36
0
R40
0
INFRARRED RX
LED
V_MA IN
R46
200K
DNP
MODULAR REFERENCE BOARD
R47
0
V_3V6
TP 1 9 TP20
D9
MBR 0 520L T1 G