TH8065 Datasheet, PDF (13/40 Pages) Melexis Microelectronic Systems – Voltage Regulator with LIN Transceiver and Watchdog

TH8065
Voltage Regulator with LIN Transceiver and Watchdog
3. Functional Description
The TH8065 consists of a low drop voltage regulator 5V/70mA and a LIN bus transceiver, which is a bi-
directional bus interface for data transfer between LIN bus and the LIN protocol controller.
Additionally integrated is a RESET unit with a power-on-reset delay of 8ms (optional 4,15 or 30ms).
and a programmable watchdog time which will be defined by an external capacity.
3.1 Operating Modes
The TH8065 provides three main operating modes “normal”, “sleep” and “low slew” and the intermediate
states “Ini-state” and “thermal shutdown”. The main modes are fixed states defined by basic actions (VSUP
start, EN or wake-up). The intermediate states are soft states. They aren’t defined by logical actions but by
changes of voltage (VSUP, VCC) or junction temperature.
VSUP power on
Set Slew_State = L
UVR / POR
VSUP > UVR_OFF
clear Reset-Timer
Start Regulator -> VCC ramp up
RESET = L
Wake-up disabled
VSUP < UVR_ON
Ini-state
VCC > Vres (4.65V) &
Slew_State=L
VCC < Vres
VSUP < UVR_ON
VCC > Vres (4.65V) &
Slew_State=H
Regulator on
RESET = L / after tres RESET=H
and Watchdog activated
Wake-up disabled
LIN-Transceiver on/ normal slew mode
Normal-
Mode
EN= L/H edge & TxD=H
Tj > Tjshd
Tj < Tjrec
Tj > Tjshd
VSUP > UVR_ON &
BUS Wake-up
Sleep-
Mode
EN= H/L
EN=L
Regulator off
Thermal shutdown off
Wake-up enabled (LIN-Receiver on)
LIN-Transmitter off
EN= L/H edge & TxD=L
VCC < Vres
Tj > Tjshd
Low Slew
Mode
EN= H/L
Regulator on
RESET = L / after tres RESET=H
and Watchdog activated
Wake-up disabled
Set Slew State = H
LIN-Transceiver on/ low slew mode
thermal
shutdown
Regulator off
Wake-up disabled
LIN-Transceiver off
TH8065 – Datasheet
3901008065
Figure 5 - State diagram of operating modes
Page 13 of 40
May 2006
Rev 003