MCP3004-I 查看數據表（PDF） - Microchip Technology

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MCP3004-I

2.7V 4-Channel/8-Channel 10-Bit A/D Converters with SPI Serial Interface

Microchip Technology 

MCP3004/3008

CS

CLK

tSUCS

tCYC

tCSH

tCYC

DIN

DOUT

Start

D2 D1 D0

SGL/

DIFF

HI-Z

Don’t Care

Null

Bit

B9

B8

B7

B6

B5

B4

B3

B2

B1 B0 *

Start

D2

SGL/

DIFF

HI-Z

tSAMPLE

tCONV

tDATA **

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

first data, then followed with zeros indefinitely. See Figure 5-2 below.

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

a high-impedance node.

FIGURE 5-1:

Communication with the MCP3004 or MCP3008.

CS

CLK

tSUCS

tCYC

Power Down

tCSH

DIN

DOUT

Start

D2 D1 D0

Don’t Care

SGL/

DIFF

HI-Z

Null

Bit

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

B1

B2

B3

B4

B5

B6

B7

B8

B9*

HI-Z

(MSB)

tSAMPLE

tCONV

tDATA **

* 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 powers down while the reference input becomes

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

FIGURE 5-2:

Communication with MCP3004 or MCP3008 in LSB First Format.

DS21295D-page 20

© 2008 Microchip Technology Inc.

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