MaximIntegrated 7-2
MAX31782 User’s Guide
Revision 0; 8/11
SECTION 7: I
2
C-COMPATIBLE SLAVE INTERFACE
The MAX31782 provides an I
2
C-compatible slave controller that allows the MAX31782 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 MAX31782 with new user flash memory . The I
2
C slave interface can be set up to provide system interrupts
after each I
2
shows the basic operation flow of the I
2
C slave controller . The blocks in
that
are shaded are shown in more detail in
.
Figure 7-1. Slave I
2
C Flow
7.1DetailedDescription
7.1.1DefaultOperation
The I
2
C slave controller is enabled (I2CCN_S .I2CEN=1) by default . As long as the I
2
C slave controller is enabled, the
MAX31782 I
2
C bootloader can operate . This allows bootloading of blank devices without any setup of the I
2
C slave con-
troller . Prior to the I
2
C slave controller being used for normal data communication, some software setup is required . This
setup includes setting an I
2
C slave address and telling the slave controller which I
2
C events should generate interrupts .
DETECT START
I2CSRI = 1
I2CBUS = 1
I2CBUSY = 1
RECEIVE
SLAVE
ADDRESS
DETECT STOP
I2CSPI = 1
I2CBUS = 0
RECEIVE
DATA
TRANSMIT
DATA
I2CAMI = 1?
Y
N
Y
I2CNACKI
STOP?
R/W BIT
I2CMODE
0
0
1
1
N
Y
STOP?
N
