Owner manual

DS4830 User’s Guide
89
SECTION 11 – I
2
C-COMPATIBLE SLAVE INTERFACE
The DS4830 provides an I
2
C-compatible slave controller that allows the DS4830 to communicate with a host device. This
controller can also operate as an SMBUS slave. Also designed into the I
2
C slave controller is the ability to bootload the
DS4830 with new user Flash memory. The I
2
C slave interface can be setup to provide system interrupts after each I
2
C
event. Figure 11-1 shows the basic operation flow of the I
2
C slave controller. The blocks in Figure 11-1 that are shaded
are shown in more detail in Figure 11-2.
Detect STOP
I2CSPI=1
I2CBUS=0
1
Y
I2CNACKI
Receive
Slave
Address
Transmit
Data
Detect START
I2CSRI=1
I2CBUS=1
I2CBUSY=1
I2CAMI=1
?
Y
N
STOP ?
0
N
R/W Bit
I2CMODE
Receive
Data
Y
STOP ?
N
0
1
Figure 11-1: Slave I
2
C Flow