TH8065 Datasheet, PDF (30/40 Pages) Melexis Microelectronic Systems – Voltage Regulator with LIN Transceiver and Watchdog

TH8065
Voltage Regulator with LIN Transceiver and Watchdog
4.5 Connection to Flash-MCU
While programming a flash MCU the TH8065 should be disconnected from the MCU. This can be done via
disconnecting the supply voltage from the TH8065 or by switching off with the EN pin. The reverse current
supply of the IC via the RxD pin, if the connected MCU pin is used as normal signal input and programming
input, must be inhibited via a decoupling diode. In this case the MCU must be supplied via the programming
interface.
Prog.-Data
10u...47u
TH8065
VCC
RESET
TxD
RxD
47n...100n
V_{high_RxD} >= 4.7V at V_CC = 5V
V_{low_RxD} = 0.8V
0.7V
MCU
V_high = 4V at V_CC = 5V
Figure 22 – Example circuitry for connection of RxD to MCU for flash programming
The programming of the Flash is also possible via the LIN pin, if the MCU supports this kind of flash mode.
TH8065 – Datasheet
3901008065
Page 30 of 40
May 2006
Rev 003