MCP3302-BISLASHP datasheet(27/46 Pages) MICROCHIP

27 / 46 page

DS21697E-page 27

MCP3302/04

FIGURE 6-2:

Communication with MCP3302/04 (MSB first Format).

FIGURE 6-3:

Communication with MCP3302/04 (LSB first Format).

CLK

DIN

DOUT

HI-Z

Don’t Care

Null

Bit

B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 *

HI-Z

TACQ

TCONV

SGL/

DIFF

Start

TSAMPLE

TCSH

TSAMPLE

SGL/

DIFF

Start

* After completing the data transfer, if further clocks are applied with CS low, the A/D Converter will output LSB

first data, followed by zeros indefinitely. See Figure 6-3 below.

** TDATA: during this time, the bias current and the comparator power down while the reference input becomes

a high-impedance node, leaving the CLK running to clock out the LSB-first data or zeros.

† When operating in single ended mode, the sign bit will always be transmitted as a ‘0’.

TDATA **

TSUCS

SB†

Null

Bit

B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11

CLK

DOUT

HI-Z

(MSB)

TCONV

TDATA **

Power Down

TACQ

Start

SGL/

DIFF

DIN

TSAMPLE

TCSH

* After completing the data transfer, if further clocks are applied with CS low, the A/D Converter will output zeros

indefinitely.

** TDATA: During this time, the bias circuit and the comparator power down while the reference input becomes

a high-impedance node, leaving the CLK running to clock out LSB first data or zeroes.

† When operating in single ended mode, the sign bit will always be transmitted as a ‘0’.

TSUCS

Don’t Care

SB†

SB*

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