EVB51JM128 Freescale Semiconductor, EVB51JM128 Datasheet - Page 11

• Manufacturer Part Number: EVB51JM128
• Description: BOARD EVAL FOR MCF51JM128 MCU
• Manufacturer: Freescale Semiconductor
• Series: ColdFire®r
• Type: MCUr

Specifications of EVB51JM128

• Contents: Evaluation Board
• Silicon Manufacturer: Freescale
• Core Architecture: Coldfire
• Core Sub-architecture: Coldfire V1
• Silicon Core Number: MCF51J
• Silicon Family Name: Flexis - MCF51JM
• Rohs Compliant: Yes
• For Use With/related Products: MCF51JM128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

E V B 5 1 J M 1 2 8
VREFL Option Header
The VREFL option header connects the target device VREFL input to the EVB digital ground
by default. This option header may be used to apply ultra clean ground or to measure input
current under operating conditions.
VX_EN Option Header
The VX_EN option header is a 2-pin jumper that connects the target-board voltage rail to IO
connector position J1A-1. IO connector position J1A-3 connects directly to the ground plane.
This input requires a regulated +3.3V voltage source. This power input is decoupled to mini-
mize noise input but is not regulated. Also, no protection is applied on this input and damage
to the target board may result if over-driven. Do not attempt to power the target board through
this connector while also applying power through the PWR connector as damage to the board
may result.
Power may be sourced to off-board circuitry through the MCU_PORT. The current limitation of
the on-board regulator must be considered when attempting to source power to external cir-
cuitry. Excessive current drain may damage the target board or the on-board regulator. The
figure below shows the VX_EN option header connections.
Figure 5: VX_EN Option Header
RESET Switch
The RESET switch allow the manual application of the RESET* signal. Application of RESET
halts the current operation and initializes internal registers to their default state. The previous
operating state of the MCF51JM128 will be lost.
External reset may also be applied directly to the RESET * signal at connector J1A-4.
CAUTION: Do not apply power to connector J1 while also sourcing power from either the
NOTE: Do not exceed available current supply from on-board regulator when sourcing power
VX_EN
VX_EN
▪
▪
through connector J1 to external circuitry.
U S E R
ON
OFF
PWR connector. Damage to the board may result.
G U I D E
Enable power connection to connector J1
Disable power connection to connector J1
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F E B R U A R Y
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