TH8065KDCAA MELEXIS [Melexis Microelectronic Systems], TH8065KDCAA Datasheet - Page 15

• Manufacturer Part Number: TH8065KDCAA
• Description: Voltage Regulator with LIN Transceiver and Watchdog
• Manufacturer: MELEXIS [Melexis Microelectronic Systems]

3.2 Initialization
Initialization starts if the power supply is switched on as well as every rising edge on of the TH8065 via the
EN pin.
VSUP- Power-ON
If V
dynamic POR and under voltage reset circuitry generates a POR signal, which switches the TH8065 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) and V
initializes the voltage regulator.
The effects of both POR circuits at different VSUP slopes will show in Figure 6.
After POR the voltage regulator starts and the VCC voltage will be output. If V
be activated. If the V
output switches from low to high (see Figure 12).
The Initialization procedure operates after POR independent from the EN voltage.
Start of Linear Regulator via Wake-up
The initialization is only being done for the VCC circuitry parts. This procedure begins with leaving the master
reset state (V
3.3 Wake-Up
If the regulator is put into sleep mode it can be woken up with the BUS interface. Every pulse on the BUS
(high pulse or low pulse) with a pulse width of min. 70μs switches on the regulator.
The low slew mode has to be selected again if necessary.
After the BUS has woken up the regulator, it can only be switched off with a high level followed by a low level
on the EN pin.
TH8065 – Datasheet
3901008065
SUP
is switched on the TH8065 starts to normal mode via the POR- and Ini-state. A combination of
CC
> V
VSUP
V
V
MRes
SUVR_ON
SUVR_OFF
VCC
CC
) and runs in the same manner as the VSUP-Power-On.
voltage level is higher than V
Figure 6 - Operating of power-on and under-voltage reset
UVR
POR
normal mode
Voltage Regulator with LIN Transceiver and Watchdog
Page 15 of 40
EN=H/L
SUP
RES
> V
, the reset time t
sleep mode
SUVR_OFF
POR
(typ. 3.5V) the under voltage reset unit
Res
UVR
normal mode
is started. After t
CC
>V
MRes
TH8065
the bus interface will
Res
the RESET
May 2006
Rev 003