Freescale Semiconductor MPC5668EVB, User Manual

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MPC5668EVB Users Manual Rev 0.1 May 2009
MPC5668EVBUM/D Page 28 of 29
The user connectors are
located on the right hand
side of the PCB
6. User Connector Descriptions
This section details the pinout of the EVB user connectors. The connectors are 0.1 inch pitch turned pin
headers and are located to the right hand side of the EVB. Pins are grouped by port functionality and the PCB
legend shows the respective port number adjacent to each pin.
6.1.1 Port A / ADC (Connector J86, RV1, J73 and J74)
Table 6-1. Port A Connector Pinout (P17)
Pin
Function
Pin
Function
GPIO 1
st
Alt GPIO 1
st
Alt
1 PA0 AN0 2 PA1 AN1
3 PA2 AN2 4 PA3 AN3
5 PA4 AN4 6 PA5 AN5
7 PA6 AN6 8 PA7 AN7
9 PA8 AN8 10 PA9 AN9
11 PA10 AN10 12 PA11 AN11
13 PA12 AN12 14 PA13 AN13
15 PA14 AN14 16 PA15 AN15
17 GND 18 GND
To provide a quick means of supplying input to the ATD (Analogue To Digital converter), a 2K
Ω
variable
resistor (RV1) will is connected between P5V and GND, with the output (centre tap) connected to PA0 / AN0
via jumper J86. By removing jumper J86, PA0 is disconnected from the variable resistor and can function as a
normal I/O port. J86 and RV1 are located next to P17.
To allow the EVB core voltages to be monitors by the ATD J74 allows the 2.5v, 3.3v and 5v Switcher and
Linear regulator outputs to be connected to the ATD inputs. J73 allows the 12v EVB supply to be monitored
via resister ladder to reduce the voltage to a level that is in spec of the ATD’s range. 65% of the 12v supply is
applied to the ADC via the resistor ladder.
Table 6-2 RV1 Connection Jumper J8
Jumper Position PCB Legend Description
J86
(RV1)
FITTED
Output from variable resistor RV1 is applied to PA0
REMOVED (D) Output from RV1 is not connected to MCU (disabled)
J73
(ADC VSUP)
FITTED
65% of the output from 12v Reg is applied to PA14
REMOVED (D) 12v Reg Output is not connected to PA14
J74
POSN 1-2
FITTED
Output from 2.5v Reg is connected to PA10
REMOVED (D) Output from 2.5v Reg is NOT connected to PA10
J74
POSN 3-4
FITTED
Output from 3.3v Reg is connected to PA10
REMOVED (D) Output from 3.3v Reg is NOT connected to PA10
J74
POSN 5-6
FITTED
Output from 5v Switching Reg is connected to PA10
REMOVED (D)
Output from 5v Switching Reg is NOT connected to
PA10
J74
POSN 7-8
FITTED
Output from 5v Linear Reg is connected to PA10
REMOVED (D) Output from 5v Linear Reg is NOT connected to PA10
Note - PA14 and PA15 can also be used for the EXTAL32 and XTAL32 32Khz reference clock. If these pins
are used for this purpose, they will not be available for GPIO / ADC input.