TLE8457CSJ datasheet(11/31 Pages) INFINEON

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Data Sheet

Rev. 1.1

2018-10-15

TLE8457C / TLE8457D

LIN Transceiver with integrated voltage regulator

Functional description

4.1.5

Mode transition via EN pin

The EN input is used for operation mode control of the TLE8457C / TLE8457D. By setting the EN input logic

“high” for the time tMODE,HIGH while being in standby mode, a transition to normal operation mode will be

triggered.

If the voltage level at the EN input is set logic “high” while the TLE8457C / TLE8457D is in sleep mode, a

transition to normal mode is initiated.

From normal operation mode the TLE8457C / TLE8457D can be set to either sleep mode or standby mode. If

the EN input is set “low” for the time tMODE,LOW while the TxD input is held at logic “high”, the mode will change

to standby mode. For a transition to sleep mode, the TxD must be set to logic “low” before the time tMODE,LOW

elapses after EN goes “low” (see Figure 7). It is recommended to program a short delay time from when EN is

set “low” until TxD is set “low”, to prevent driving the BUS dominant through mode transition to sleep mode.

The EN input has an integrated pull-down resistor to ensure the device remains in a low power mode if the EN

input is left open. The EN input has an integrated hysteresis (see Figure 7).

The TLE8457C / TLE8457D changes the operation modes regardless of the signal on the BUS pin. In the case of

a short circuit failure between the LIN bus and GND, resulting in a permanent dominant signal, the TLE8457C

/ TLE8457D can be set to sleep mode.

Figure 7

Operation mode control

The EN input is blocked while the TLE8457C / TLE8457D is in normal operation mode or standby mode and

NRST is “low”, indicating an undervoltage on Vcc. After the NRST output goes “high”, mode control with the EN

input is released again.

4.2

Power supplies

The TLE8457C / TLE8457D is designed for being supplied by the battery line through an external reverse

polarity protection diode at the VS pin (see Figure 16). An input capacitor is needed for damping input line

transients.

4.2.1

Power-up and power-down

During power-up the TLE8457C / TLE8457D will enter standby mode when the VS supply reaches the power-on

reset level VS,PON. The voltage regulator output VCC will track the VS supply voltage until VCC reaches its nominal

voltage level. As VCC reaches the undervoltage level VCC,UV, the NRST output will stay logic “low” for the reset

TLE8457CD_MODE_CONTROL

Normal Operation

mode

Standby mode

Normal Operation

mode

Sleep mode

TxD

VEN,OFF

EN hysteresis

tMODE,HIGH

tMODE,LOW

tMODE,HIGH

VEN,ON

NRST

tRST

Normal Operation mode

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