MFRC522 datasheet(91/109 Pages) NXP

91 / 109 page

112132

Product data sheet

Rev. 3.2 — 22 May 2007

91 of 109

NXP Semiconductors

MFRC522

Contactless Reader IC

23.9 I2C Timing

Table 175. Overview I2C Timing in Fast mode

Symbol Parameter

Fast mode

High speed mode

Unit

Min

Max

Min

Max

fSCL

SCL clock frequency

400

3400

kHz

tHD;STA

Hold time (repeated) START condition.

After this period, the first clock pulse is

generated

600

160

tSU;STA

Set-up time for a repeated START

condition

600

160

tSU;STO

Set-up time for STOP condition

600

160

tLOW

LOW period of the SCL clock

1300

160

tHIGH

HIGH period of the SCL clock

600

tHD;DAT

Data hold time

900

tSU;DAT

Data set-up time

100

trscl

Rise time SCL signals

300

tfscl

Fall time SCL signals

300

trsda

Rise time of both SDA and SCL signals

300

tfsda

Fall time of both SDA and SCL signals

300

tBUF

Bus free time between a STOP and

START condition

1.3

μs

Fig 31. Timing for F/S mode devices on the I2C-bus.

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