TC1322EOA データシートの表示（PDF） - Microchip Technology

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TC1322EOA

12-Bit Digital-to-Analog Converter with Two-Wire Interface

Microchip Technology 

TC1322

4.6 Register Set and Programmer’s

Model

TABLE 4-2:

TC1322 COMMAND SET

(SMBus READ_BYTE AND

WRITE_BYTE)

Command Byte Description

Command

Code

Function

RWD

RWCR

00h

Read/Write Data (DATA)

01h

Read/Write Configuration

(CONFIG)

TABLE 4-3: CONFIGURATION REGISTER

(CONFIG), 8-BIT, READ/WRITE

Configuration Register (CONFIG)

D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]

Bit

D[0]

D[7]-D[1]

Reserved

SHDN

POR

Function

Type Operation

0 Standby Switch Read/ 1 = Standby

Write 0 = Normal

0 Reserved;

N/A

N/A

Always returns

Zero when Read

TABLE 4-4: DATA REGISTER (DATA),

12-BIT, READ/WRITE

Data Register (DATA) for 1st Byte

D[11] D[0] D[9] D[8] D[7] D[6] D[5] D[4]

MSB X

X

X

X

X

X LSB

Data Register (DATA) for 2nd Byte

D[3] D[2] D[1] D[0] X

X

X

X

X

X

X LSB X

X

X

X

The DAC output voltage is a function of reference volt-

age and the binary value of the contents of the register

DATA. The transfer function is given by the expression:

EQUATION 4-1:

VOUT

=

VREF

x

⎡ DATA ⎤

⎣ 4096 ⎦

4.7 Register Set Summary

The TC1322’s register set is summarized in Table 4-5

below. All registers are 12-bits wide.

TABLE 4-5: TC1322 REGISTER SET

SUMMARY

Name Description

POR State Read Write

Data Data Register

000000000000b X

X

(2-Byte Format)

Config CONFIG Register 0000 0000b

X

X

DS21388C-page 10

© 2005 Microchip Technology Inc.

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