TC1322 Datasheet, PDF (10/16 Pages) Microchip Technology – 12-Bit Digital-to-Analog Converter with Two-Wire Interface

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:
V_OUT
=
V_REF
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
DS21388B-page 10
© 2002 Microchip Technology Inc.