MAX9132/MAX9134/MAX9135
Programmable, High-Speed, Multiple
Input/Output LVDS Crossbar Switches
______________________________________________________________________________________ 13
MAX9135 LSB first, up to a maximum data rate of
20kbps. The LIN slave node waits for the synchronization
pulse, then synchronizes itself to the pulse. The node
must then read the identifier and send/receive data bytes
to the master, setting the error flag register when neces-
sary. The LIN interface uses the same routing function of
the switch control registers (0x01, 0x02) as the I
2
C inter-
face. The routing action takes place after correct check-
sum verification. The LIN status register (0x00) holds the
error flags for the LIN transceiver. For a write, the master
writes 2 bytes of data to the registers (0x01, 0x02). For a
read, the slave outputs the contents of registers 0x00,
0x01, and 0x02, along with the stuffing byte at a constant
value (0xFF). In either mode, the checksum follows at the
end of the data bytes. Figure 3 shows the write and read
signal frame format. Figure 4 shows the LIN write and
read data frame.
LIN-Protected Identifier
The LIN bus uses the 8-bit protected identifier (PID) to
address the slave nodes. Two parity bits (MSBs) along
with 6 ID bits (LSBs) make up the PID field. Table 4
defines the sets of the identifiers for the write/read
operations of the LIN slave node. AS0 selects the iden-
tifiers. AS1/NSLP becomes the NSLP output for activat-
ing the LIN driver chip (MAX13020).
LIN Error Handling
Register 0x00 contains the error flags found in the LIN
signal by the slave note (Table 5). A successful LIN
read resets register 0x00.
Pin Control by S[5:0] (MAX9134/MAX9135)
The programming pins S[5:0] initially set the switch
routing upon power-up, while the device latches the
state of these pins. The I
2
C interface can override the
power-on state later. Table 6a gives the details of the
routing control for the MAX9134. Table 6b gives the
details of the routing control for the MAX9135.
Applications Information
3-Level Inputs
The MAX9132/MAX9134/MAX9135 use several 3-level
inputs to control the device. Use three-state logic to
realize the 3-level logic using digital control.
Alternatively, if a high-impedance output is unavailable,
apply a voltage of V
DD
/2 to realize the midlevel high-
impedance state.
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