L9803 STMicroelectronics, L9803 Datasheet - Page 31

• 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

L9803
4
4.1
4.1.1
Voltage Regulator
Introduction
The on chip voltage regulator provides two regulated voltage, nominally 5V both. VCC
supplies ADC and the analog periphery and VDD supplies the microcontroller and logic
parts. These voltage are available at pins VDD and VCC to supply external components and
connects a capacitors to optimize EMI performance. A pre-regulator circuit allows to connect
external tantalum capacitors to a lower (10V) voltage (VB2 pin).
Functional Description
The main supply voltage is taken from VB1 pin. A voltage pre-regulator provides the
regulated voltage on pin VB2. VB2 is the supply for the digital and analog regulators. The
block diagram shows the connections between the regulators and the external pins.
In order to prevent negative spikes on the battery line to propagate on the internal supply
generating spurious reset, a series diode supply VB1 pin is recommended.
Figure 15. Voltage regulation block diagram
Battery
VB1
VB2
PRE-REGULATOR
REGULATOR
REGULATOR
VOLTAGE
VOLTAGE
ANALOG
DIGITAL
ADC
sense
force
Voltage Regulator
VCC
AGND
VDD
GND
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