Freescale Semiconductor Tower System Kit TWR-56F8400 TWR-56F8400-KIT TWR-56F8400-KIT Manual Do Utilizador
Códigos do produto
TWR-56F8400-KIT
TWR-56F8400 User’s Manual
Page 6 of 35
2 Hardware Features
This section provides more details about the features and functionality of the TWR-56F8400.
A drawing of the TWR-56F8400 showing the jack locations is shown in Appendix D. Features are
discussed below.
A drawing of the TWR-56F8400 showing the jack locations is shown in Appendix D. Features are
discussed below.
2.1 Tower MCU Module
The TWR-56F8400 board is an MCU Module designed for standalone use (or with a Freescale Tower
system) and complies with the electrical and mechanical specification as described in Freescale Tower
Electromechanical Specification. Connection to the Tower system is through two expansion card-edge
connectors that interface to the Elevator boards in a Tower system: the Primary and Secondary
Elevator connectors. The Primary Elevator connector, comprised of sides A and B, is utilized by the
TWR-56F8400, while the Secondary Elevator connector only makes connections to ground (GND). On
sheet 8 of the schematic the J500A and J500B symbols have names assigned to the card edge fingers
that correspond with the normal Tower pin assignments.
system) and complies with the electrical and mechanical specification as described in Freescale Tower
Electromechanical Specification. Connection to the Tower system is through two expansion card-edge
connectors that interface to the Elevator boards in a Tower system: the Primary and Secondary
Elevator connectors. The Primary Elevator connector, comprised of sides A and B, is utilized by the
TWR-56F8400, while the Secondary Elevator connector only makes connections to ground (GND). On
sheet 8 of the schematic the J500A and J500B symbols have names assigned to the card edge fingers
that correspond with the normal Tower pin assignments.
2.2 System Power
The TWR-56F8400 board has three power rails. They are P5V_USB, P3_3V and P3_3V/5V. They are
sourced and used as follows:
sourced and used as follows:
2.2.1 P5V_USB
The P5V_USB power rail is derived from the Mini-B USB connector at J18 and the inductor at L2. It is
used to power the on board OSBDM/OSJTAG/Serial Bridge circuit. This consists of the OSBDM/OSJTAG
MCU at U6, several pull-up resistors at R13, R14, R15, R527, and R528, the USB power switch at U501,
and the STATUS and TPWR LEDs at D12 and D13. If there is no USB cable connected to J18 there is no
power on this rail and these circuits are all powered down.
used to power the on board OSBDM/OSJTAG/Serial Bridge circuit. This consists of the OSBDM/OSJTAG
MCU at U6, several pull-up resistors at R13, R14, R15, R527, and R528, the USB power switch at U501,
and the STATUS and TPWR LEDs at D12 and D13. If there is no USB cable connected to J18 there is no
power on this rail and these circuits are all powered down.
2.2.2 P3_3V
The P3_3V power rail is derived from a) the P3_3V_MOTOR power net from the motor control board
connector at J501, b) the P3_3V_ELEV power net from the tower connector at J500, or c) the on board
3.3V regulator at U1. The selection of which source is made with a shunt from J7-2 to another pin of J7
or to J6. Table 6 shows the operation of the different shunt positions. The selection of power into the
regulator is made with a shunt from J11-2 to another pin of J11 or to J10 which selects from a) the
P5V_TRG_USB power net out of the USB switch at U501, b) the P5V_ELEV power net from the elevator
connection at J500 pins A1 and B1, or c) the PWR_IN power net from the 2mm barrel jack at J3 through
resettable fuse F1. Table 6 shows the operation of the different shunt positions. The barrel jack input is
protected from reverse voltage inputs by diode D11. The input to the barrel jack may be from a 5V to
9V source and needs to be center positive.
connector at J501, b) the P3_3V_ELEV power net from the tower connector at J500, or c) the on board
3.3V regulator at U1. The selection of which source is made with a shunt from J7-2 to another pin of J7
or to J6. Table 6 shows the operation of the different shunt positions. The selection of power into the
regulator is made with a shunt from J11-2 to another pin of J11 or to J10 which selects from a) the
P5V_TRG_USB power net out of the USB switch at U501, b) the P5V_ELEV power net from the elevator
connection at J500 pins A1 and B1, or c) the PWR_IN power net from the 2mm barrel jack at J3 through
resettable fuse F1. Table 6 shows the operation of the different shunt positions. The barrel jack input is
protected from reverse voltage inputs by diode D11. The input to the barrel jack may be from a 5V to
9V source and needs to be center positive.