PFS123 datasheet(103/104 Pages) PADAUK

103 / 104 page

PFS123

8bit MTP MCU with 12-bit R-Type ADC

Page 103 of 104

PDK-DS-PFS123-EN_V000-Aug. 26, 2020

On-board Writing

PFS123 can support On-board writing. On-Board Writing is known as the situation that the IC has to be

programmed when the IC itself and other peripheral circuits and devices have already been mounted on the

PCB. Five wires of PDK5S-P-003 are used for On-Board Writing: ICPCK, ICPDA, VDD, GND and ICVPP. They

are used to connect PA3, PA6, VDD, GND and PA5 of the IC correspondingly.

The above figure shows the connection for PFS123 on-board writing. In this figure, ☆can be either resistors

or capacitors. They are used to isolate the programming signal wires from the peripheral circuit. it should

be≧10KΩfor resistance while ≦220pF for capacitance.

Notice:



In general, the limited-voltage programming mode is used in On-board Writing, Please refers to the 13.2

for more detail about limited-voltage programming mode.



Any zener diode ≦5.0V, or any circuitry which clam the 5.0V to be created SHOULD NOT be

connected between VDD and GND of the PCB.



Any capacitor ≧500uF SH OULD NOT be connected between VDD and G ND of the PCB.



In general, the writing signal pins PA3, PA5 and PA6 SHOULD NOT be considered as strong output

pins.

PFS123 Datasheet(PDF) 103 Page - PADAUK Technology.