Grounding System; External Analog Signal Input; Dc Level Insertion; Analog Input Connection Jumpers - Microchip Technology DIGITAL POWER User Manual

Hide thumbs

Table Of Contents

Table of Contents

1.2.3

The entire board ground potential is connected together and forms one galvanically

common domain. The labels, "Analog" and "Digital", indicate the geometrical domain.

The copper pour connected to the ground potential is split into two geometrical

domains, but the two geometrical domains are jointed together under the PIM socket,

thus improving the signal integrity and keeping noise confined to near their sources.

1.2.4

It is possible to insert an analog signal to any ADC input from a signal generator via a

standard BNC connector. The input impedance is 50. Input signals between the

ground and +3.3V are accepted. An overvoltage protection is implemented on this input

with a series resistor, and a pair of parallel diodes between the ground and the positive

supply rail.

1.2.5

Two on-board potentiometers are connected between the ground and the +3.3V supply

rail to provide two stable DC levels. The two DC levels can be set independently with

potentiometers: P1 and P2. These DC signals can be used as an input signal to any

ADC input. The DC level set by P1 can be connected to the upper half, while P2 can

be connected to the lower half of the ADC inputs, at the analog input connection

jumpers.

1.2.6

The ADC inputs of the DP PIM board can be accessed directly from the pin header (J3)

located at the left side of the board. These inputs can also be connected to either the

external analog signal input (J7) or to the DC level insertion, respectively. The

three-row pin header matrix, J4, J5, J6 (No. 7 in

jumper for each ADC input. When placing a jumper over the left, or over the right and

the middle pins, the corresponding ADC input can be connected to the extra input as

indicated on the silkscreen. The left side pins connect the external analog signal input,

while the right side pins connect the DC level insertion to the given ADC input. Two

positions on the DAC outputs are not connected. The pins on those positions are just

placeholders to keep the pin order. Three pins are connected to GND at both ends of

the jumper row. Jumpers can be stored on those pins if not needed. Two jumpers are

provided in the kit.

1.2.7

There are two push buttons on the board: SW1 and SW2. Push button SW2, which is

directly connected to the RESET pin of the DP PIM board, is for the system Reset. For

dual core devices, this RESET is connected to the Master core Reset line. Push button

SW1 is a general purpose user interface connected to the TP27 test point and the

corresponding pin on the DP PIM.

1.2.8

A standard extension socket (J10) is provided on the board for mikroBUS

click boards™. The functionality of the board can be easily extended by using this

feature. The DP PIM board communicates with the mikroBUS socket via dedicated SPI

lines and the I

corresponding pins of the mikroBUS socket. The Reset button is connected to the

mikroBUS socket RESET pin.

 2018 Microchip Technology Inc.