User's Manual

1323x-Modular Reference Board
1323x Development Hardware Reference Manual, Rev. 1.0
3-10 Freescale Semiconductor
Header J9 provides means to disable different sub-circuits or measure current and connections are
described in Table 3-3. Current measurements can be made by inserting a current meter in place of a
designated jumper.
Table 3-2. 1323x-MRB Power Configurations
Mode
Voltage
Range
External
Source
J5
Ext Mode
Select
J6
Current Enable
J9
Description
Source V_BRD 2.7 - 3.6 V
1
1
The MC1323x can run as low as 1.8 V, however, the serial FLASH and IR blaster require 2.7 V or greater
Not used Not used - all
pins open
Short Pins 3-4 -
short other desired
supplies
Normal Operation -
The 1323x-MRB main supply is
supplied by the motherboard
through the J2 and J3 Headers
External Source
- Using LDO
3.5 - 16 V Connected -
supplies
DC Voltage
Short Pins 1-2 Short pins for all
desired supplies
External voltage w/regulation -
• Input range is set by the LDO
regulator.
• 3.3 V is supplied to 1323x-MRB;
do not use motherboard supply
• J2 and J3 Headers supply
voltage to V_BRD pins when J9,
Pins 3-4 are shorted
External Source
- Not Using LDO
2.7 - 3.6 V
1
Connected -
supplies
DC Voltage
Short Pins 2-3 Short pins for all
desired supplies
External voltage w/o regulation -
• Input range is set by the onboard
circuitry
• 2.7 - 3.3 V is supplied to
1323x-MRB
• J2 and J3 Headers supply
voltage to V_BRD pins
Table 3-3. Power Distribution Header J9
Supply
Designation
Header
Pins
Description
V_MEM 1 - 2 Supply voltage to serial FLASH memory -
• Jumper pins to supply memory.
• If memory is not powered, it can load MC1323x SPI port
V_BRD 3 - 4 Supply voltage connected to IO Connectors J2 and J3 -
• This supplies J2 and J3 if an external MRB supply is used
• This voltage supplies the MRB if the motherboard is the main power
• This connection is normally always jumpered
V_IC 5 - 6 Supply voltage to MC1323x -
• Normally jumpered
• Supplies only the MC1323x IC
• Normally always same voltage as V_BRD
V_LED 7 - 8 Supply voltage to power indicator LED and IR blaster LED -
• Jumper to use indicator or IR blaster
• Leave open for lowest power