TH8061 Datasheet, PDF (16/36 Pages) Melexis Microelectronic Systems – Voltage Regulator with integrated LIN Transceiver

TH8061
Voltage Regulator with integrated LIN Transceiver
3.4 VSUP under voltage reset
The under voltage detection unit inhibit an undefined behaviour of the TH8061 under low voltage condition. If
VSUP drops below V_{SUVR_ON} (typ. 3V) the under voltage detection becomes active and the IC will be
switched to POR state. The following increasing of VSUP above V_{SUVR_OFF} (typ. 3.5V) cancels this POR state
and the voltage regulator starts with the initialization sequence.
VSUP under voltage in Normal Mode
Supply Voltages below V_{SUVR_OFF} don’t influence the voltage regulator. The output voltage Vcc follows VSUP.
VSUP under voltage in Sleep Mode
No exit from the sleep mode will take place if the VSUP voltage drops down to V_{SUVR_ON} (typ. 3V). The under
voltage reset becomes active (POR-state). As a result of this operating, the sleep mode is left to the normal
mode. If VSUP rises again above V_{SUVR_OFF} (typ. 3.5V) the IC initialize the voltage regulator and continue to
work with the normal mode.
The under voltage reset unit secures stable operating in the under voltage range of VSUP down to GND
level. The dynamic Power-On-Reset secures a defined internal state independent from the duration of the
VSUP drop, which secures a stable restart.
3.5 Overtemperature Shutdown
If the junction temperature is 155°C < T_J < 170°C the over-temperature recognition will be activated and the
regulator voltage will be switched off. The V_CC voltage drops down, the reset state is entered and the bus-
transceiver is switched off (recessive state).
After T_J falls below 140°C the TH8061 will be initialized again (see Figure 16) independently from the voltage
levels on EN and BUS. Within the thermal shutdown mode the transceiver can’t be switched to the normal
mode neither with local nor with remote wake-up.
The operation of the TH8061 is possible between T_Amax (125°C) and the switch off temperature, but small
parameter differences can appear.
After over-temperature switch-off the IC behaves as described in chapter 3.8 RESET.
TH8061 – Datasheet
3901008061
Page 16 of 36
June 2004
Rev 007