TC1320 Datasheet, PDF (8/14 Pages) Microchip Technology – 8-Bit Digital-to-Analog Converter with Two-Wire Interface

TC1320
FIGURE 4-1:
TIMING DIAGRAMS
SMBus Write Timing Diagram
A
B
C
D
EF
G
I_LOW I_HIGH
SCL
SDA
H
I
J
K
t_SU(START) t_H(START)
t_SU-DATA
A = START Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low
F = Acknowledge Bit Clocked into Master
G = MSB of Data Clocked into Master
H = LSB of Data Clocked into Master
I = Acknowledge Clock Pulse
J = STOP Condition
K = New START Condition
t_SU(STOP) t_IDLE
SMBUS Read Timing Diagram
A
B
C
D
EF
G
ILOW IHIGH
SCL
SDA
H
IJ
K
LM
t_SU(START) t_H(START)
t_SU-DATA
t_H-DATA
t_SU(STOP) t_IDLE
A = START Condition
B = MSB of Address Clocked into Slave
C = LSB of Address Clocked into Slave
D = R/W Bit Clocked into Slave
E = Slave Pulls SDA Line Low
F = Acknowledge Bit Clocked into Master
G = MSB of Data Clocked into Slave
H = LSB of Data Clocked into Slave
I = Slave Pulls SDA Line Low
J = Acknowledge Clocked into Master
K = Acknowledge Clock Pulse
L = STOP Condition, Data Executed by Slave
M = New START Condition
4.6 Register Set and Programmer’s
Model
TABLE 4-2:
TC1320 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
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
DS21386B-page 8
© 2002 Microchip Technology Inc.