Rainbow Electronics MAX9135 - Manual (Page 12)

MAX9132/MAX9134/MAX9135
Programmable, High-Speed, Multiple
Input/Output LVDS Crossbar Switches
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multiple data bytes are transmitted before a STOP con-
dition is detected, these bytes are generally stored in
subsequent MAX9132/MAX9134/MAX9135 internal reg-
isters because the command byte address generally
autoincrements (Table 1).
Data Format for Reading from the Slave
The MAX9132/MAX9134/MAX9135 are read using the
devices’ internally stored command bytes as an
address pointer, the same way the stored command
byte is used as an address pointer for a write. The
pointer does not autoincrement after each data byte is
read. Initiate a read by writing the command byte to the
proper slave address (Figure 2), then send the device’s
slave address with the R/
W bit set to 1. The slave now
responds with the contents of the requested register
(Figure 2).
LIN Interface
The LIN interface is a low-speed, low-cost interface used
in slow control signal traffic in automotive applications.
This device is the slave node in the LIN bus cluster and
is designed based on the LIN Rev. 1.3 specification. The
LIN master sends data to the MAX9132/MAX9134/
FRAME SLOT
FRAME
RESPONSE
SPACE
INTER-
FRAME
SPACE RESPONSE HEADER
BREAK SYNC PROTECTED
INDENTIFIER
TRANSMITTED
FROM MASTER
TRANSMITTED
FROM A MASTER OR SLAVE
*N = 2 FOR WRITE
AND 4 FOR READ
DATA 1 DATA 2 DATA N* CHECKSUM
Figure 3. LIN Bus Signal Format
READ FORMAT WRITE FORMAT
0x00 0x01 0x01
DATA 1 DATA 2 DATA 1 DATA 2 DATA 3 DATA 4
0x02 0x02 0xFF
Figure 4. LIN Write and Read Data Frame
PIN ADDRESS
AS0 AS1 A[7:5] A4 A3 A2 A1 A0
ADDRESS (HEX)
Low Low 101 0 0 0 0 R/ W 0xA0
Low Open 101 0 0 0 1 R/ W 0xA2
Low High 101 0 0 1 0 R/ W 0xA4
Open Low 101 0 0 1 1 R/ W 0xA6
Open Open 101 0 1 0 0 R/ W 0xA8
Open High 101 0 1 0 1 R/ W 0xAA
High Low 101 0 1 1 0 R/ W 0XAC
High Open 101 0 1 1 1 R/ W 0xAE
High High 101 1 0 0 0 R/ W 0xB0
Table 3. I 2 C Slave Addresses