MCP3421A3T-E/CH 查看數據表（PDF） - Microchip Technology

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MCP3421A3T-E/CH

18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference

Microchip Technology 

MCP3421

5.6.5

ACKNOWLEDGE AND NON-

ACKNOWLEDGE

The Master (microcontroller) and the slave (MCP3421)

use an acknowledge pulse as a hand shake of commu-

nication for each byte. The ninth clock pulse of each

byte is used for the acknowledgement. The clock pulse

is always provided by the Master (microcontroller) and

the acknowledgement is issued by the receiving device

of the byte (Note: The transmitting device must release

the SDA line during the acknowledge pulse.). The

acknowledgement is achieved by pulling-down the

SDA line “LOW” during the 9th clock pulse by the

receiving device.

(A)

(B)

(D)

SCL

SDA

During reads, the Master (microcontroller) can

terminate the current read operation by not providing

an acknowledge bit (not Acknowledge (NAK)) on the

last byte. In this case, the MCP3421 device releases

the SDA line to allow the Master (microcontroller) to

generate a STOP or repeated START condition.

The non-acknowledgement (NAK) is issued by

providing the SDA line to “HIGH” during the 9th clock

pulse.

(D)

(C) (A)

START

CONDITION

ADDRESS OR DATA

ACKNOWLEDGE ALLOWED

VALID TO CHANGE

FIGURE 5-6:

Data Transfer Sequence on I2C Serial Bus.

STOP

CONDITION

© 2009 Microchip Technology Inc.

DS22003E-page 23

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