TD340

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Microcontroller support

For easy system integration, the TD340 provides the following functions:

- 5V regulator,

- reset circuit,

- watchdog circuit,

- standby mode,

- temperature indicator.

5V regulator

The TD340 provides a 5V regulated voltage at VOUT pin with a maximum current of 20mA over the whole

Vbatt range (6.5 to 16V). Current can be up to 40 mA with nominal 12V Vbatt.

It is mandatory to connect a 220nF capacitor to the 5V output, even if the 5V output is not used, because

the 5V is internally used by the device. 220nF is the optimized value for the voltage regulator.

Reset circuit

The integrated supervisor circuit resets the micro controller as soon as the voltage of the Micro Controller

decreases below 4.2V, and until the voltage of the micro controller has not passed above 4.3V.

RESET output is active low. It features an open drain with a internal 75k pull up resistor to internal 5V

which allows hardwired OR configuration.

Figure 6 : Reset Waveforms

Vth i

Vth d

Vc cm in

Vr e set

Vo u t

t

t

tp h l

zo om

1V