TH8061 Datasheet, PDF (13/36 Pages) Melexis Microelectronic Systems – Voltage Regulator with integrated LIN Transceiver

TH8061
Voltage Regulator with integrated LIN Transceiver
3. Functional Description
The TH8061 consists of a low drop voltage regulator 5V/50mA 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 output with a reset delay of 100ms and a fixed threshold of 4.65V.
3.1 Operating Modes
The TH8061 provides two main operating modes “normal” and “sleep” and the intermediate states “POR”,
“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
POR
clear all state-FF
VSUP > UVR_OFF
clear reset timer
Regulator On -> VCC ramp up
RESET = L
Wake-up disabled
VSUP < UVR_ON
Ini-state
VSUP < UVR_ON
VSUP > UVR_OFF &
(EN= L/H or BUS Wake-up)
VCC > V_RES (4.65V)
VCC < V_RES
EN=H
Normal-
Mode
Regulator on
RESET = L after 100ms
RESET=H
Wake-up disabled
LIN-Transceiver on
EN=L
Sleep-
Mode
EN= H/L
sleep mode &
TJ < TJREC
normal mode &
T_J < T_JREC
normal mode &
T_J > T_JSHD
Regulator off
Wake-up enabled (LIN-Receiver on)
LIN-Transmitter off
sleep mode &
TJ > TJSHD
thermal
shutdown
TJ > TJREC
Regulator off
Wake-up disabled
LIN-Transceiver off
Figure 10 - State diagram of operating modes
TH8061 – Datasheet
3901008061
Page 13 of 36
June 2004
Rev 007