LPC54101J512BD64QL Datasheet, PDF(62/90 Page) NXP Semiconductors – 32-bit ARM Cortex-M4/M0+ MCU; 104 kB SRAM; 512 kB flash, 3 x I2C, 2 x SPI, 4 x USART, 32-bit counter/ timers, SCTimer/PWM, 12-bit 5.0 Msamples/sec ADC

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LPC54101J512BD64QL Datasheet, PDF (62/90 Pages) NXP Semiconductors – 32-bit ARM Cortex-M4/M0+ MCU; 104 kB SRAM; 512 kB flash, 3 x I2C, 2 x SPI, 4 x USART, 32-bit counter/ timers, SCTimer/PWM, 12-bit 5.0 Msamples/sec ADC

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NXP Semiconductors

LPC5410x

32-bit ARM Cortex-M4/M0+ microcontroller

[6] The maximum tf for the SDA and SCL bus lines is specified at 300 ns. The maximum fall time for the SDA output stage tf is specified at

250 ns. This allows series protection resistors to be connected in between the SDA and the SCL pins and the SDA/SCL bus lines

without exceeding the maximum specified tf.

[7] In Fast-mode Plus, fall time is specified the same for both output stage and bus timing. If series resistors are used, designers should

allow for this when considering bus timing.

[8] The maximum tHD;DAT could be 3.45 ïs and 0.9 ïs for Standard-mode and Fast-mode but must be less than the maximum of tVD;DAT or

tVD;ACK by a transition time. 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.

70 %

SDA 30 %

SCL

70 %

30 %

tSU;DAT

70 %

30 %

tHD;DAT

70 %

30 %

1 / fSCL

70 %

30 %

tLOW

tHIGH

tVD;DAT

70 %

30 %

Fig 20. I2C-bus pins clock timing

002aaf425

LPC5410x

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 2.6 â 3 October 2016

62 of 90

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