TLE7257 Datasheet, PDF (7/31 Pages) Infineon Technologies AG – LIN Transceiver

TLE7257
Functional Description
4.1
Operating Modes
The TLE7257 has 3 major operation modes (see Figure 4):
• Normal Operation mode
• Standby mode
• Sleep mode
Table 1 Operating modes
Mode
Sleep
Standby
EN INH
TxD
RxD
Low Floating Disable¹⁾ High²⁾
Low High
High³⁾
Low
LIN Bus Termination Comments
30 kΩ (typical)
No wake-up request detected
30 kΩ (typical)
–
Normal High 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
3
Normal Operation Mode
INH: High
EN: High
Sleep Mode
INH: Floating
EN: Low
TxD: Disabled ¹⁾
RxD: High ²⁾
5
2
EN
4
1) _{TxD: The TxD input is disabled and the pull-up current source is switched off}
2) _{RxD: The RxD output is „high“ because of the external pull-up resistor}
Figure 4 Operation mode state diagram
Standby Mode
INH: High
EN: Low
TxD: High
RxD: Low
TLE7257_MODE_DIAGRAM
Data Sheet
7
Rev. 1.0, 2013-10-16