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12311-MRB

12311 Development Hardware Reference Manual, Rev. 1

3-10 Freescale Semiconductor

Header J13 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. 12311-MRB Power Configurations

Mode

Voltage

Range

External

Source

Ext Mode

Select

Current Enable

J13

Description

Source V_BRD 2.7 - 3.6 V

The MC12311 can run as low as 1.8 V

Not used Not used - all

pins open

Short Pins 3-4 -

short other desired

supplies

Normal Operation -

The 12311-MRB main supply is

supplied by the motherboard

through the J15 and J14 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 12311-MRB;

do not use motherboard supply

• J14 and J15 Headers supply

voltage to V_BRD pins when J13,

Pins 3-4 are shorted

External Source

- Not Using LDO

2.7 - 3.6 V 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

12311-MRB

• J14 and J15 Headers supply

voltage to V_BRD pins

Table 3-3. Power Distribution Header J13

Supply

Designation

Header

Pins

Description

V_RF 1 - 2 Supply voltage to MC12311 -Radio die

• Normally jumpered

• Supplies only the MC12311 Radio die

Normally always same voltage as V_BRD

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 MC12311 -MCU die

• Normally jumpered

• Supplies only the MC12311 MCU die

• Normally always same voltage as V_BRD

V_LED 7 - 8 Supply voltage to power indicator LED

• Jumper to use indicator or IR blaster

• Leave open for lowest power