MPC8572EAMC Freescale Semiconductor, MPC8572EAMC Datasheet - Page 50

• Manufacturer Part Number: MPC8572EAMC
• Description: MPC8572 AMC RAPID SYSTEM
• Manufacturer: Freescale Semiconductor
• Type: MPUr

Specifications of MPC8572EAMC

• Contents: Board
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: MPC8572E

MPC8572EAMC Functional Description
generate a combined resistance of 29.201 kΩ = 1.1001 V). Similarly, the Power-One YM12S05 (3.3 V
voltage regulator) requires a trim resistor of 3.12 kΩ. (A parallel resistor combination (3.3 kΩ//59 kΩ) is
used to create a resistance value of 3.125 kΩ. This gives an output voltage of 3.298 V).
The Maxim MAX8526 device also has a configurable output voltage that uses a similar resistor
arrangement to select the desired output voltage. Manufacturers guidelines recommend VFB = 0.5 V and
R2 < 5 kΩ in order to optimize quiescent current, accuracy, and high-frequency power-supply rejection.
R2 is chosen to be 4.7 kΩ. Selection of the desired output voltage is given using the following equations.
Substituting these values into the equations above for Vout values of 2.5 and 1.2 V yields: 2.5 V = 18.8 kΩ,
1.2 V = 6.58 kΩ. Using standard resistance values, the closest resistors are 18.7 kΩ and 6.98 kΩ
respectively.
the MPC8572EAMC.
PSU Voltage
The MPC8572E requires its power rails to be applied in specific sequence in order to ensure proper device
operation. These requirements are as follows for power up:
All supplies must be at their stable values within 50 ms. Correct power rail sequencing is achieved by via
CPLD control.
5-26
1. VDD, AVDD_n, BVDD, SCOREVDD, LVDD, TVDD, XVDD, OVDD
2. GVDD
3.3
2.5
1.2
1.1
Power-One—YM12S05
Maxim—MAX8526
Maxim—MAX8526
Power-One—YNC12S20
Table 5-16
Manufacturer
MPC8572EAMC Advanced Mezzanine Card User Guide, Rev. 1.2
summarizes the trim resistors required for the Power-one and Maxim devices on
Table 5-16. Voltage Regulation/Device Parameters
Vout (V) Trim Resistor (kΩ) Trim Resistor Standard Value (kΩ) Vout Actual (V)
3.3
2.5
1.2
1.1
R1 = 18.7 kΩ
R1 = 6.98 kΩ
R2 = 4.99 kΩ
R2 = 4.7 kΩ
29.216 kΩ
3.122 kΩ
3.3 kΩ//59 kΩ
R1 = 6.57 kΩ
43 kΩ//91kΩ
R1 = 18K7
Freescale Semiconductor
1.1001
3.298
2.489
1.198