TH8062 Datasheet, PDF (22/38 Pages) Melexis Microelectronic Systems – Voltage Regulator with LIN Transceiver

TH8062
Voltage Regulator with LIN Transceiver
3.9 Mode Input EN
The TH8062 is switched into the sleep mode with a falling edge and into normal mode with a rising edge at
the EN pin. The normal mode will be kept as long as EN = high.
The deactivation of TH8062 with a falling edge at EN can be done independently from the state of the bus-
transceiver.
EN
ESD
voltage
limiter
Filter
6μs
enable
Figure 13 - EN input circuitry
The maximum input voltage is VSUP. The threshold is typ. 1.4V and therefore also 5V and 3.3V CMOS
levels can be used as input signal. Figure 13 shows the internal circuitry of the EN pin.
The EN input has an internal pull down resistor of typ. 25k to secure that if this pin is not connected a low
level will be generated. An input debouncing filter of 6µs suppresses effectively disturbance couplings via the
EN pin
It will use different pull down resistors for normal and sleep mode to minimize the sleep mode current.
The wide input voltage range allows different EN control possibilities. If the EN input is connected to a CMOS
output of the MCU, a falling edge switches the TH8062 into sleep mode (the regulator is also switched off).
The wake up is only possible via the bus line.
V_BAT
LIN
C_IN
180p
TH8062
C_load
VSUP
EN
GND
BUS
VCC
RESET
TxD
RxD
MCU
+5V
Figure 14 - EN controlled via MCU
TH8062 – Datasheet
3901008062
Page 22 of 38
March 2006
Rev 002