MCP6S2XEV【PDF 12/36 页】BOARD EVALUATION FOR MCP6S2X

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MCP6S2X Evaluation Board (Rev. 4) User’s Guide

1.2

EVALUATION BOARD DESCRIPTION

The single-channel MCP6S21 and six-channel MCP6S26 have been selected for this

evaluation board. The PIC16F676 microcontroller is used to program the PGAs accord-

ing to the user inputs. User inputs are selected using the on-board DIP switch settings

that are configured according to the table printed on the evaluation board. This allows

the user to program the channel, gain and shutdown of each PGA. Either PGA or both

PGAs can be shut down. The six channels of the MCP6S26 and the PGA gains of 1, 2,

4, 5, 8, 10, 16 and 32 V/V can be configured. Refer to Appendix D.”Setup Conditions” ,

for additional information.

When the momentary READ push button switch is pressed, the microcontroller reads

the DIP switch configuration through the I/O ports. The controller determines the proper

command and data bytes to be transmitted to the PGAs and the transmits a 16 or 32-bit

word through the Serial Peripheral Interface (SPI?) port.

When the momentary MCLR push button switch is pressed, the microcontroller Master

Clear is activated. This resets the microcontroller to a known initial state.

The ICSP connector provides the capability of programming the PIC16F676 from a PC.

This requires additional hardware, such as MPLAB ? ICD 2.

The two PGAs are cascaded, while the signal output of the MCP6S26 is directly

connected to the analog input of the MCP6S21. This configuration outputs a maximum

signal gain of 1024 V/V.

The digital lines of the PGA are daisy chained. The MCP6S26 has a Serial-Out (SO)

line that can be used to serially program another device. Therefore, the SO line is con-

nected to the Serial-In (SI) line of the MCP6S21. If the MCP6S26 is removed from the

socket, the MCP6S21 cannot be programmed.

The MCP6S2X family of PGAs has a reference voltage input pin to offset the output

signal. There are three reference voltage options on the board: 2.5V, adjustable refer-

ence voltage (0V to 5V) and ground. These options can be selected using the on-board

jumper (JP1).

A prototype area is available for user circuit interface. The inputs, outputs and refer-

ence voltage traces of the PGAs conveniently pass near the prototype area for ease

of connection. Test point connectors are available to interface with external circuits.

The signals V IN_0 , V IN_1 , V OUT_1 and V OUT_2 can use SMA connectors that slide hor-

izontally onto the board. 50 ? termination resistors can be added to V IN_O and V IN_1 .

Refer to Appendix A.”Schematic and Board Layouts” and Appendix D.”Setup

Conditions” , for additional information.

DS51327B-page 8

? 2004 Microchip Technology Inc.

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