TC1321 Datasheet, PDF (10/16 Pages) Microchip Technology – 10-Bit Digital-to-Analog Converter with Two-Wire Interface

TC1321
4.6 Register Set and Programmer’s
Model
TABLE 4-2:
TC1321 COMMAND SET
(SMBus READ_BYTE AND
WRITE_BYTE)
Command Byte Description
Command
RWD
RWCR
Code
00h
01h
Function
Read/Write Data (DATA)
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
POR
Function
Type
0 Standby Switch Read/
Write
0 Reserved;
N/A
Always returns
Zero when Read
SHDN
Operation
1 = Standby
0 = Normal
N/A
TABLE 4-4: DATA REGISTER (DATA),
10-BIT, READ/WRITE
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] X
X
X
X
X
X
X LSB X
X
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:
V_OUT
=
V_REF
x
 ^DATA 
 1024 
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
Name Description
POR State Read Write
Data DATA Register 0000000000b X
X
(2-Byte Format)
Config CONFIG Register 0000 0000b X
X
DS21387B-page 10
© 2002 Microchip Technology Inc.