TH8061 Datasheet, PDF (14/36 Pages) Melexis Microelectronic Systems – Voltage Regulator with integrated LIN Transceiver

TH8061
Voltage Regulator with integrated LIN Transceiver
Normal Mode
The whole TH8061 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)
(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 TH8061 is switched from normal
mode into sleep mode. The voltage regulator 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.
POR-state
This is the power-on-reset state of the TH8061, while Vsup < V_{SUVR_OFF}. If the prior state was sleep mode,
the TH8061 switches via the ini-state to normal mode.
Ini-state
This is an intermediate state, which will pass through after switch on of VSUP or VCC. The TH8061 remains
in this state if VCC 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 TH8061 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 TH8061 will be recover to the
previous state (normal or sleep).
3.2 Initialization
Initialization is started if the power supply is switched on as well as every rising edge on of the TH8061 via
the EN pin.
VSUP- Power-ON
If V_SUP is switched on the TH8061 starts to normal mode via the POR- and Ini-state. A combination of
dynamic POR and under voltage reset circuitry generates a POR signal, which switches the TH8061 into
normal mode. This power on behaviour is independent from the status of the EN-pin.
Power-on reset and under-voltage reset operates independent from each other, which secures the
independence from the rise time of VSUP. During fast VSUP edges the power-on reset will be active. If the
increasing of VSUP is very slow (> 1ms/V) the under voltage reset unit initializes the voltage regulator if
V_SUP > V_{SUVR_OFF} (typ. 3.5V).
The effects of both POR circuits at different VSUP slopes will shown in Figure 11.
TH8061 – Datasheet
3901008061
Page 14 of 36
June 2004
Rev 007