MAX9258AGCM+ Maxim Integrated, MAX9258AGCM+ Datasheet - Page 38

• Manufacturer Part Number: MAX9258AGCM+
• Description: Serializers & Deserializers - Serdes Prog Serializer / Deserializer
• Manufacturer: Maxim Integrated
• Type: Deserializerr

Specifications of MAX9258AGCM+

• Rohs: yes
• Data Rate: 840 Mbit/s
• Input Type: LVDS
• Output Type: LVCMOS
• Number Of Inputs: 1
• Number Of Outputs: 18
• Operating Supply Voltage: 1.7 V to 3.6 V
• Operating Temperature Range: - 40 C to + 105 C
• Package / Case: LQFP-48
• Maximum Operating Temperature: + 105 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT

The UART frame used to program the MAX9257A and the
MAX9258A has a low start bit, eight data bits, an even
parity bit and a high stop bit. The data following the start
bit is the LSB. With even parity, when there are an odd
number of 1s in the data bits (D0 through D7) the parity
bit is set to 1. The stop bit is sampled and if it is not high,
a frame error is generated
The synchronization frame must precede any read or
write packets
brate the oscillators on the devices. The baud rate of the
Figure 25. UART-to-I
Figure 26. UART Frame Format
Figure 27. UART Synchronization Frame
START
0
0
S
START
I
2
C SLAVE ADDRESS + Wr
0
(Figure
SLAVE ADDRESS
4
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2
1
SYNCHRONIZATION FRAME
C Conversion
Fully Programmable Serializer/Deserializer
26). Transitions in the frame cali-
D0
0
UART Synchronization Frame
1
(Figure
W
A
0
D1
LSB
5
26).
UART Frame Format
1
MSB
REG ADDRESS
REG ADDR
0
D2
MAX9257
1
ECU
with UART/I
PARITY
1
UART
LSB
D3
MSB LSB
UART
STOP
A
I
2
C
MAX9258
MSB
D4
PERIPHERAL
synchronization frame sets the operat ing baud rate of the
control channel. At power-up, UART data rate must be
between 95kbps to 400kbps. After power-up, UART data
rate can be programmed according to Tables 28 and 29.
Data is serialized start ing with the LSB first. The synchro-
nization frame is 0x54 as shown in
The ECU writes the sync frame, 7-bit device address plus
read/write bit (R/W = 0 for write), 8-bit register address,
number of bytes to be written, and data bytes
The ECU must follow this UART protocol to correctly pro-
gram the devices.
DATA 0
Figure 28. UART Write Packet to MAX9257A/MAX9258A
DATA 0
SYNC
MAX9257A/MAX9258A
D5
DEV ADDR +
LSB
R/W
MSB
2
A
D6
C Control Channel
REG ADDRESS
LSB
D7
MSB
DATA N
NUMBER OF BYTES
DATA N
PARITY
Figure
MSB
LSB
STOP
A
27.
Write Packet
BYTE 1
P
(Figure
BYTE N
28).