MCP6S21 datasheet(15/43 Pages) MICROCHIP

15 / 43 page

 2003 Microchip Technology Inc.

DS21117A-page 15

MCP6S21/2/6/8

3.0

PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1:

PIN FUNCTION TABLE

3.1

Analog Output

The output pin (VOUT) is a low-impedance voltage

source. The selected gain (G), selected input (CH0-

CH7) and voltage at VREF determine its value.

3.2

Analog Inputs (CH0 thru CH7)

The inputs CH0 through CH7 connect to the signal

sources. They are high-impedance CMOS inputs with

low bias currents. The internal MUX selects which one

is amplified to the output.

3.3

External Reference Voltage (VREF)

The VREF pin should be at a voltage between VSS and

VDD (the MCP6S22 has VREF tied internally to VSS).

The voltage at this pin shifts the output voltage.

3.4

Power Supply (VSS and VDD)

The positive power supply pin (VDD) is 2.5V to 5.5V

higher than the negative power supply pin (VSS). For

normal operation, the other pins are between VSS and

VDD.

Typically, these parts are used in a single (positive)

supply configuration. In this case, VSS is connected to

ground and VDD is connected to the supply. VDD will

need a local bypass capacitor (0.1 µF) at the VDD pin.

It can share a bulk capacitor with nearby analog parts

(typically 2.2 µF to 10 µF within 4 inches (100 mm) of

the VDD pin.

3.5

Digital Inputs

The SPI interface inputs are: Chip Select (CS), Serial

Input (SI) and Serial Clock (SCK). These are Schmitt-

triggered, CMOS logic inputs.

3.6

Digital Output

The MCP6S26 and MCP6S28 devices have a SPI

interface serial output (SO) pin. This is a CMOS push-

pull output and does not ever go High-Z. Once the

device is deselected (CS goes high), SO is forced low.

This feature supports daisy chaining, as explained in

Section 5.3, “Daisy Chain Configuration”.

MCP6S21

MCP6S22

MCP6S26

MCP6S28

Symbol

Description

1111

VOUT

Analog Output

2222

CH0

Analog Input

—

CH1

Analog Input

—

CH2

Analog Input

—

CH3

Analog Input

—

CH4

Analog Input

—

CH5

Analog Input

—

CH6

Analog Input

—

CH7

Analog Input

3—

VREF

External Reference Pin

449

VSS

Negative Power Supply

SPI Chip Select

SPI Serial Data Input

—

SPI Serial Data Output

SCK

SPI Clock Input

VDD

Positive Power Supply

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