TH8065KDCAA MELEXIS [Melexis Microelectronic Systems], TH8065KDCAA Datasheet - Page 24

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

3.9 Mode Input EN
The TH8065 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 TH8065 with a falling edge at EN can be done independently from the state of the bus-
transceiver.
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 15 shows the internal circuitry of the EN pin.
The EN input has an internal pull down resistor of typ. 23k 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 TH8065 into sleep mode (the regulator is also switched off).
The wake up is only possible via the bus line.
TH8065 – Datasheet
3901008065
V
LIN
BAT
EN
C
IN
ESD
220p
Figure 16 - EN controlled via MCU
Voltage Regulator with LIN Transceiver and Watchdog
Figure 15 - EN input circuitry
Page 24 of 40
voltage
limiter
GND
VSUP
EN
GND
BUS
CWD
GND
TH8065
RESET
GND
GND
VCC
RxD
WDI
TxD
C
load
Filter
6μs
+5V
MCU
TH8065
enable
May 2006
Rev 003