PFS122
8bit MTP MCU with 12-bit R-Type ADC
On-board Writing
PFS122 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 PFS122 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 SHOULD NOT be connected between VDD and GND of the PCB.
In general, the writing signal pins PA3, PA5 and PA6 should not be considered as strong output pins.
©Copyright 2020, PADAUK Technology Co. Ltd
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PDK-DS-PFS122-EN_V000-May 28, 2020
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