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參數(shù)資料
型號： MAX9257AGCM/V+
廠商： Maxim Integrated Products
文件頁數(shù)： 35/53頁
文件大小： 0K
描述： IC SERDE PROG UART/I2C 48TQFP
標準包裝： 250
系列： *
Maxim Integrated Products 40
MAX9257A/MAX9258A
Fully Programmable Serializer/Deserializer
with UART/I2C Control Channel
I2C
The MAX9257A features a UART-to-I2C converter that
converts UART packets to I2C. The UART-to-I2C con-
verter works as a repeater between the ECU and external
I2C slave devices. The MAX9257A acts as the master
and converts UART read/write packets from the ECU to
I2C read/write for external I2C slave devices. For writes,
the UART-to-I2C converts the UART packets received
directly into I2C. For reads, the UART-to-I2C converter
follows the UART packet protocol. The I2C SCL clock
period is approximately the same as the UART bit clock
period (tUCLK). The I2C speed varies with UART speed.
I2C reads from the peripheral device do not disable the
ETO timer. Choose ETO large enough so that I2C read
commands are not lost due to ETO timing out.
I2C Timing
The MAX9257A acts like a master in I2C communication
with the peripheral device. The MAX9257A takes less
than 22 UART bit times to convert UART packets into I2C.
The SCL and SDA timings are based on the UART bit
clock. The I2C data rate is determined by UART and can
range from 95kbps to 4.25Mbps. The I2C timing require-
ments scale linearly from fast mode to higher speeds.
Table 31 shows the I2C timing information for data rates
greater than 400kbps. The I2C parameters scale with
tUCLK. See Figure 30 for timing parameters.
Table 31. Timing Information for I2C Data Rates Greater than 400kbps
Figure 30. I2C Timing Parameters
*tUCLK is equal to one UART period.
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
SCL Clock Frequency
fSCL
1
tUCLK*
Start Condition Hold Time
tHD:STA
1
tUCLK
Low Period of SCL Clock
tLOW
0.5
tUCLK
High Period of SCL Clock
tHIGH
0.5
tUCLK
Repeated START Condition Setup Time
tSU:STA
0.25
tUCLK
Data Hold Time
tHD:DAT
0.25
tUCLK
Data Setup Time
tSU:DAT
0.25
tUCLK
Setup Time for STOP Condition
tSU:STO
0.25
tUCLK
Bus Free Time
tBUF
0.5
tUCLK
P
tBUF
tR
tHD;STA
P
S
tHD;STA
tLOW
tHD;DAT
tHIGH
tF
tSU;DAT
tSU;STA
tSU;STO
SCL
SDA
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相關代理商/技術參數(shù)
參數(shù)描述
MAX9257AGCV 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Fully Programmable Serializer/Deserializer with UART/I2C Control Channel
MAX9257AGTL 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Fully Programmable Serializer/Deserializer with UART/I2C Control Channel
MAX9257AGTL/V+ 功能描述:串行器/解串器 - Serdes Prog Serializer / Deserializer RoHS:否 制造商:Texas Instruments 類型:Deserializer 數(shù)據(jù)速率:1.485 Gbit/s 輸入類型:ECL/LVDS 輸出類型:LVCMOS 輸入端數(shù)量:1 輸出端數(shù)量:20 工作電源電壓:2.375 V to 2.625 V 工作溫度范圍:0 C to + 70 C 封裝 / 箱體:TQFP-64
MAX9257AGTL/V+T 功能描述:串行器/解串器 - Serdes Prog Serializer / Deserializer RoHS:否 制造商:Texas Instruments 類型:Deserializer 數(shù)據(jù)速率:1.485 Gbit/s 輸入類型:ECL/LVDS 輸出類型:LVCMOS 輸入端數(shù)量:1 輸出端數(shù)量:20 工作電源電壓:2.375 V to 2.625 V 工作溫度范圍:0 C to + 70 C 封裝 / 箱體:TQFP-64
MAX9257AGTL+ 功能描述:串行器/解串器 - Serdes Prog Serializer / Deserializer RoHS:否 制造商:Texas Instruments 類型:Deserializer 數(shù)據(jù)速率:1.485 Gbit/s 輸入類型:ECL/LVDS 輸出類型:LVCMOS 輸入端數(shù)量:1 輸出端數(shù)量:20 工作電源電壓:2.375 V to 2.625 V 工作溫度范圍:0 C to + 70 C 封裝 / 箱體:TQFP-64
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