參數(shù)資料
型號: EA-XPR-001
廠商: Embedded Artists
文件頁數(shù): 50/74頁
文件大?。?/td> 0K
描述: BOARD LPCXPRESSO LPC1343
標(biāo)準(zhǔn)包裝: 1
系列: LPCXpresso
類型: MCU
適用于相關(guān)產(chǎn)品: EA-XPR-021,ARM Cortex-M3
所含物品: 板,軟件
配用: EA-XPR-021-ND - BOARD BASE LPCXPRESSO
LPC1311_13_42_43
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 5 — 6 June 2012
54 of 74
NXP Semiconductors
LPC1311/13/42/43
32-bit ARM Cortex-M3 microcontroller
[8]
The maximum tHD;DAT could be 3.45
μs and 0.9 μs for Standard-mode and Fast-mode but must be less than the maximum of tVD;DAT or
tVD;ACK by a transition time (see UM10204). This maximum must only be met if the device does not stretch the LOW period (tLOW) of the
SCL signal. If the clock stretches the SCL, the data must be valid by the set-up time before it releases the clock.
[9]
tSU;DAT is the data set-up time that is measured with respect to the rising edge of SCL; applies to data in transmission and the
acknowledge.
[10] A Fast-mode I2C-bus device can be used in a Standard-mode I2C-bus system but the requirement tSU;DAT = 250 ns must then be met.
This will automatically be the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the
LOW period of the SCL signal, it must output the next data bit to the SDA line tr(max) + tSU;DAT = 1000 + 250 = 1250 ns (according to the
Standard-mode I2C-bus specification) before the SCL line is released. Also the acknowledge timing must meet this set-up time.
Fig 28. I2C-bus pins clock timing
002aaf425
tf
70 %
30 %
SDA
tf
70 %
30 %
S
70 %
30 %
70 %
30 %
tHD;DAT
SCL
1 / fSCL
70 %
30 %
70 %
30 %
tVD;DAT
tHIGH
tLOW
tSU;DAT
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