TLE7257

Functional Description

Data Sheet

15

Rev. 1.0, 2013-10-16

4.8

Undervoltage Detection

Figure 11

Early undervoltage detection

The TLE7257 has undervoltage detection on the

V

•

In Normal Operation mode the TLE7257 blocks the communication between the LIN bus and the

microcontroller when detecting undervoltage events. However, no mode change will occur. After

V

above the undervoltage release level

V

signal on the TxD input goes “high”. See Figure 11.

•

In case the

V

communication between the LIN bus and the microcontroller, and also changes the operation mode to Sleep

mode after

V

Figure 12

Undervoltage detection and power-on reset

TLE7257_UNDERVOLTAGE_EARLY

Supply voltage

V

S

Power-on reset level

V

S,UV,PON

Normal Operation mode

Normal Operation mode

Blanking time

t

blank,UV

Communication blocked

Undervoltage release level

V

S,UV,ON

Undervoltage hysteresis

V

S,UV,HYS

V

S

t

Undervoltage

detection level

V

S,UV,OFF

TLE7257_UNDERVOLTAGE_RESET

Device unpowered

Supply voltage

V

S

Normal Operation mode

Sleep mode (EN = „low“)

Normal Operation mode (EN = “high“)

Blanking time

t

blank,UV

Undervoltage release level

V

S,UV,ON

Undervoltage hysteresis

V

S,UV,HYS

Power-on reset level

V

S,UV,PON

Communication blocked

V

S

t

Undervoltage

detection level

V

S,UV,OFF