TLE9221SX Datasheet, PDF (31/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Power Supply Interface
8
Power Supply Interface
The Power Supply Interface distributes the correct voltages to the single function blocks within the TLE9221SX. It
manages the power-up and power-down procedures, monitors the supply voltages uV_BAT, uV_CC and also the
reference voltage uV_IO. To control external circuitry, an INH output is available (see Figure 22).
.
INH
Driver
Voltage Monitor
V_BAT
V_CC
Central
State
Machine
Internal Supply
V_IN
V_IO
Host Interface
Communication Controller
Interface
Bus Guardian Interface
Figure 21 Block diagram of Power Supply Interface
The Central State Machine is the main logic control unit of the TLE9221SX. All functions, including operation mode
management, the diagnostic function and failure management are controlled and handled by the Central State
Machine. To ensure correct failure management, the Central State Machine is the first function block which is
powered up and the last function block which is powered down. For this reason, the Central State Machine is
supplied by an internal supply uV_IN (see Figure 21).
The internal supply uV_IN is in its operational range, if at least one of the two power supplies, uV_CC or uV_BAT, is above
their power-down threshold, uBDBPV_BAT or uVBDPDV_CC.
Note: The reference voltage uV_IO is the level shift supply for all digital inputs and outputs. It is not connected with
the internal supply of the central statemachine. Nevertheless, if the reference voltage uV_IO is not available
or in undervoltage condition, the internal state machine blocks all host commands and changes the mode of
operation to a low power mode.
Data Sheet
31
Rev. 1.10, 2013-07-15