User's Manual

1323x Remote Control Motherboard
1323x Development Hardware Reference Manual, Rev. 1.0
Freescale Semiconductor 4-5
Figure 4-2. 1323x-RCM Block Diagram
4.2.1 Power Management
The 1323x-RCM 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 4-3 shows the power management
circuit.
Figure 4-3. 1323x-RCM 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 an 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-RCM 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.
1323x-MRB
GPIO Header
Receptacles
Buzzer
VCC
USB
2.0
4 Blue
Indicator
LEDs
USB
Type-B
Conn
On/Off
Switch
USB <> UART
Serial IC
6x6 Switch
Matrix
Power
Management
GPIO
Pin Headers
On
LED
External DC
2 AA
Battery
Synaptic
Touchpad
IIC
128x32
Graphic/
Alphanumeric
LCD
SPI
2 PB
Switches
D13
MBR 052 0LT1G
V_BUZ
TP26R42
0
POWER ON
21
LED 5
RE D
V_LED
R39
330
V_MRB
V_LED
V_DC
V_TP D
BUZZER
V_ACC
C32
10UF
EN
6
GN D
9
L1
4
L2
2
PS/ SYN C
7
VOUT
1
VI N
5
VI NA
8
FB
10
PGN D
3
PPAD
11
U8
T PS6 3001
V_BAT
1 2
L3 3.3uH
1
32
Q3
S I 23 05
R38
4. 7 K
R41
10K
TP27
V_ USB VCC
TP 25
TP21
TP22
TP24
R45
0
C33
0.1UF
C43
10UF
R43
0
TP 2 3
C42
10 U F
R35
0
R36
0
R37
0
R40
0
LED
TOUCHPAD
ACCELEROMETER
D8
MBR 0 52 0L T1 G
V_MA IN
R46
200K
DNP
MODULAR REFERENCE BOARD
R47
0
V_3V3
D9
MBR 0 52 0L T1 G
D10
MB R 05 20LT 1G
TP 1 9
D11
MBR0520LT1G
TP20
D12
MBR0520LT1G