參數(shù)資料
型號： MAX9258GCM/V+
廠商： Maxim Integrated Products
文件頁數(shù)： 21/52頁
文件大?。?/td> 0K
描述： IC SER/DESER PROG 48-LQFP
其它有關(guān)文件： Automotive Product Guide
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 250
功能： 串行器/解串器
數(shù)據(jù)速率： 840Mbps
輸入類型： 串行
輸出類型： LVDS
輸入數(shù)： 1
輸出數(shù)： 16
電源電壓： 3 V ~ 3.6 V
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 48-LQFP
供應(yīng)商設(shè)備封裝： 48-LQFP（7x7）
包裝： 托盤
MAX9257/MAX9258
register REG2 for both the MAX9257 and the MAX9258.
The four bits of REG2[7:4] select the divide ratio (STODIV)
for the STO clock as a function of the pixel clock (Table
24). The timeout period is determined by counter bits
REG2[3:0] that increment once every STO clock period.
Write to REG2[3:0] to determine the counter end time.
The STO counter counts to the programmed STOCNT +
1. The ECU must begin communicating before STO times
out, otherwise, the control channel closes (Figure 22). The
STO timeout period is given by:
For example:
If the pixel clock frequency is set to 16MHz, STODIV is
set to 1010 (STODIV = 1024), and STOCNT is set to
1001 (STOCNT = 9), the STO timer counts with
15.625kHz STO clock (16MHz/1024) internally until it
reaches 10 and timer expires. The tSTO is equal to tT x
1024 x 10 = 640s.
The default value for STODIV is 1024 while the default
value for STOCNT is 0. That means the STO timeout
period is equal 1024 pixel clock cycles. Activity from
the ECU on the control channel shuts off the STO timer
and starts the ETO timer.
ETO Timer
The ETO (end timeout) timer closes the control channel
if the ECU stops communicating for the ETO timeout
period. Configure register REG3[7:4] for both the
MAX9257 and the MAX9258 to select the divide ratio
(ETODIV) for the ETO clock as a function of the pixel
clock (Table 25). The timeout period is determined by
t
f
STODIV
STOCNT
STO
CLK
=
××
+
1
()
28
______________________________________________________________________________________
Fully Programmable Serializer/Deserializer
with UART/I2C Control Channel
REG3[7:4]
ETODIV
00XX
16
0100
16
0101
32
0110
64
0111
128
1000
256
1001
512
1010
1024
1011
2048
1100
4096
1101
8192
1110
16,384
1111
32,768
Table 25. ETO Clock Divide Ratio
VIDEO
HSK
VSYNC_IN
SDI/O
±
CCEN
T1
T2
T3
TX
RX
DOUT_
FROZEN
T1 = TIME TO ENTER CONTROL CHANNEL
T2 = STO TIMEOUT PERIOD
T3 = CONTROL CHANNEL EXIT TIME DUE TO STO
HSK = HANDSHAKING BETWEEN THE MAX9257 AND THE MAX9258
Figure 22. Control Channel Closing Due to STO Timeout
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