Power Switching By Flexray Physical Layer - Fujitsu SK-91465X-100PMC User Manual

Jumper
JP1
(CAN A Vcc)
JP11
(CAN B Vcc)
Default: grey
Power measurements:
Via JP52 it is possible to measure the power consumption of the whole board.
Via JP55 the consumption of MCU Vcc pins can be measured.
For VDD5R consumption measurements JP64 must be used.

3.2.1 Power switching by FlexRay physical layer

This board supports power switching by FlexRay physical layer (X9, X11).
For this reason the Vcc voltage (Selected by JP63) is controlled by a MOSFET (Q2).
12V level at the Gate pin will pass the Vcc voltage to the board. Connecting 0V at the Gate
pin the MOSFET (Q2) switch off the Vcc power supply of the board.
JP25 selects if Vin (12V) or the FlexRay physical layer INHx pins are connected to the Gate
pin. JP27 selects if INHx pin of FlexRay Physical layer channel A or channel B is used for
power switching. JP19 and JP31 selects if INH1 or INH2 pins (channel A / B).
Jumper
JP25
JP27
JP19
JP31
Default: grey
Table 3-3: Jumper Settings FlexRay power switching
© Fujitsu Microelectronics Europe GmbH
SK-91465X-100PMC User Guide
Chapter 3 Jumpers and Switches
Setting Description
1 - 2 Vcc of CAN A is supplied with 5V
2 - 3 Vcc of CAN A is supplied with V_ALL
1 - 2 Vcc of CAN B is supplied with 5V
2 - 3 Vcc of CAN B is supplied with V_ALL
Table 3-2: Power supply jumper settings
Setting
1-2 Gate of MOSFET (Q2) connected to Vin
Gate of MOSFET (Q2) connected to INH pin
2-3
of FlexRay transceiver (X9, X1)
1-2
3-4
1-2
2-3
1-2
2-3
- 15 -
Description
INHx-A connected to JP25
INHx-B connected to JP25
Select Channel A INH1
Select Channel A INH2
Select Channel B INH1
Select Channel B INH2
UG-910056-11