L9803 STMicroelectronics, L9803 Datasheet - Page 32

• Manufacturer Part Number: L9803
• Description: Super Smart Power Motor Driver With 8-bit Mcu, Ram, Eeprom, Adc, Wdg, Timers, Pwm And H-bridge Driver
• Manufacturer: STMicroelectronics

Voltage Regulator
4.2
4.2.1
4.3
4.3.1
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Digital Section Power Supply
The digital supply voltage VDD is available at pin number 42 and 9. The digital ground GND
is available at pin number 43 and 12.
Pin 42 and 43 are the actual voltage regulator output and external loads must be supply by
these pin. The 100nF compensation capacitor should be connected as close as possible to
pin 42 and 43.
Pin number 9 and 12 provide an external access to the internal oscillator supply.
Resonator’s capacitors should be grounded on pin 12.
The application board can improve noise reduction in the chip connecting directly pin 42 to
pin 9 and pin 43 to pin 12 using traces as short as possible. An additional capacitor mounted
close to pin 9 and 12 can lead additional improvement.
VDD Short Circuit Protection
The output current of the digital voltage regulator is controlled by a circuit that limits it to a
maximum value (I
starts falling down. External loads must be chosen taking in account this maximum current
capability of the regulator.
Analog Section Power Supply
The analog supply voltage is available on VCC pin. The external 100nF compensation
capacitor should be placed as close as possible to this pin and AGND pin.
VCC is the reference voltage for the AD conversion and must be used to supply ratiometric
sensors feeding AD inputs. Any voltage drop between VCC pin and the sensor supply pin on
the application board, will cause the ADC to be inaccurate when reading the sensor’s
output.
VCC Short Circuit Protection
The output current of the analog voltage regulator is controlled by a circuit that limits it to a
maximum value (I
starts falling down. External loads must be chosen taking in account this maximum current
capability of the regulator.
Warning:
MAXVDD
MAXVCC
The pin VB2 is not short circuit protected so a short circuit
on this pin will destroy the device.
). When the output current exceeds this value the VDD voltage
). When the output current exceeds this value the VCC voltage
L9803