AN3029 datasheet(7/42 Pages) STMICROELECTRONICS

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AN3029

Power supply

Figure 1. Power supply

1. Optional: if a separate, external reference voltage is connected on VREF+, the two capacitors (100 nF and 1

µF) must be connected. VREF+ is either connected to VDDA or VREF.

2. N is the number of VDD and VSS inputs.

Note:

The capacitors must be connected as close as possible to the device supplies.

Placing a crystal/resonator on OSCIN/OSCOUT is optional. The resonator must be

connected as close as possible to the OSCIN and OSCOUT pins. The loading capacitance

ground must be connected as close as possible to VSS.

2.2

Main operating voltages

STM8L and STM8AL devices are processed in 0.13 µm technology. The STM8L and

STM8AL core and I/O peripherals need different power supplies. In fact, STM8L and

STM8AL devices have an internal regulator with a nominal target output of 1.8 V.

MS30982V1

VLCD

STM8L/STM8AL

N × 100 nF

VDD

+ 1 × 10 μF

100 nF + 1 μF

(note 1)

VLCD

VREF+

VDDA

VSSA

VDD 1/2/... /N

VSS 1/2/... /N

VREF

VDD

1 μF

(optional)

(note 2)

AN3029 Datasheet(PDF) 7 Page - STMicroelectronics