TLE7258D_15 Datasheet, PDF (7/31 Pages) Infineon Technologies AG – TLE7258D

TLE7258D
Functional Description
4.1
Operating Modes
The TLE7258D has 3 major operation modes (see Figure 4):
• Normal Operation mode
• Standby mode
• Sleep mode
Table 1 Operating modes
Mode
Sleep
Standby
EN TxD
RxD
Low Disabled¹⁾ High²⁾
Low High³⁾
Low
High²⁾
LIN Bus Termination
30 kΩ (typical)
30 kΩ (typical)
Comments
No wake-up request detected
RxD “low” after a bus wake-up
RxD “high“ after power-up
Normal High Low
Low
30 kΩ (typical)
RxD reflects the signal on the bus
Operation
High
High
TxD driven by the microcontroller
1) The TxD input is disabled in Sleep mode and the internal pull-up current source is switched off (see Figure 1).
2) A pull-up resistor to the external microcontroller supply is required.
3) In case the TxD input is open the state is internally set to logical “high” through the internal pull-up current source.
Power-up 1
Standby Mode
EN: Low
TxD: High
RxD: Wake-up source ¹⁾
2
5
EN
Normal Operation Mode
3
Sleep Mode
EN: Low
EN: High
TxD: Disabled ²⁾
EN
4
RxD: High ³⁾
1) _{Wake-up Source:}
RxD: logical „high“ after Power-up
RxD: logical „low“ after BUS Wake-up detection
An external pull-up resistor to the external microcontroller supply is required for the Wake-up or Power-up indication
2) _{TxD: The TxD input is disabled and the pull-up current source is switched off}
3) _{RxD: The RxD output is „high“ because of the external pull-up resistor}
TLE7258D_MODE_DIAGRAM
Figure 4 Operation mode state diagram
Data Sheet
7
Rev. 1.2, 2014-12-08