TC1321

DS21387B-page 10

© 2002 Microchip Technology Inc.

4.6

Register Set and Programmer’s

Model

TABLE 4-2:

TC1321 COMMAND SET

(SMBus READ_BYTE AND

WRITE_BYTE)

TABLE 4-3:

CONFIGURATION REGISTER

(CONFIG), 8-BIT, READ/WRITE

TABLE 4-4:

DATA REGISTER (DATA),

10-BIT, READ/WRITE

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:

4.7

Register Set Summary

The TC1321’s register set is summarized in Table 4-5

below. All registers are 10-bits wide.

TABLE 4-5:

TC1321 REGISTER SET

SUMMARY

Command Byte Description

Command

Code

Function

RWD

00h

Read/Write Data (DATA)

RWCR

01h

Read/Write Configuration

(CONFIG)

Configuration Register (CONFIG)

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

D[1]

D[0]

Reserved

SHDN

Bit

POR

Function

Type

Operation

D[0]

0

Standby Switch

Read/

Write

1 = Standby

0= Normal

D[7]-D[1]

0

Reserved;

Always returns

Zero when Read

N/A

N/A

Data Register (DATA) for 1st Byte

D[9]

D[8]

D[7]

D[6]

D[5]

D[4]

D[3]

D[2]

MSB

X

X

X

X

X

X

X

Data Register (DATA) for 2nd Byte

D[1]

D[0]

XX

X

X

X

X

XLSB

X

X

X

X

X

X

Name

Description

POR State

Read Write

Data

DATA Register

(2-Byte Format)

0000000000b

XX

Config

CONFIG Register

0000 0000b

XX

1024

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