TH8065 Datasheet, PDF (14/40 Pages) Melexis Microelectronic Systems – Voltage Regulator with LIN Transceiver and Watchdog

TH8065
Voltage Regulator with LIN Transceiver and Watchdog
Normal Mode
This mode is the base mode. The bus transceiver is able to send with a max baud rate of 20kbit/s.
The whole TH8065 is active. Switching to normal mode can be done via the following actions:
- Start of V_SUP or after under voltage reset
- Rising edge at EN (EN=high) and TxD=high (local wake-up)
- Activity on the LIN bus
(remote wake-up)
Sleep Mode
Sleep mode is most current saving. With a falling edge on EN (EN=low) the TH8065 is switched from normal
mode into sleep mode. The voltage regulator and the reset/watchdog unit will be switched off and the LIN
transceiver is in recessive state.
Switching into sleep mode can be done independently from the current transceiver state. That means if the
transmitter is in dominant state this state will be cancelled and it will be switched to recessive state.
Low Slew Mode
In this mode the slew rate is switched from the normal value of typ. 1.6V/µs to a low value of typ. 0.8V/µs.
This mode is optimized to send with a maximum baud rate of 10.4kbit/s (SAE J2602). Because of this
reduction of the slew rate the EME behaviour is improved especially in the frequency range of 100 kHz to
10MHz.
Switching to this mode is possible with a combination of rising edge on EN together with a low level on TxD.
POR-state
This is the power-on-reset state of the TH8065, while Vsup < V_{SUVR_OFF}. If the prior state was sleep mode,
the TH8065 switches via the ini-state to normal mode.
Ini-state
This is an intermediate state, which will pass through after switching on of VSUP or VCC. The TH8065
remains in this state if V_CC is below V_RES (Reset output = L) and Vsup > V_{SUVR_ON}.
Thermal Shutdown
If the junction temperature T_J is higher than T_JSHD (>155°C), the TH8065 will be switched into the thermal
shutdown mode. The behaviour within this mode is comparable with the sleep mode except for LIN
transceiver operating. The transceiver is completely disabled; no wake-up functionality is available.
If T_J falls below the thermal recovery temperature T_JREC (typ. 140°C) the TH8065 will be recover to the
previous state (normal, sleep or low slew).
TH8065 – Datasheet
3901008065
Page 14 of 40
May 2006
Rev 003