EM3027IDSWS8 datasheet(23/28 Pages) EMMICRO

23 / 28 page

EM3027

 2013, EM Microelectronic-Marin SA

3027-DS.doc, Version 8.0, 25-Jan-13

www.emmicroelectronic.com

The following conditions have to be met:

Rise time is equal to 0.847 RPU (CB + N * CI/O)  RPU < tR max / (0.847 (CB + N CI/O)), where N is total number of

I/O pins connected to the corresponding bus line.

(tR in ns, C in pF, R in kΩ)

The minimum value of the pullup resistor value can be calculated with the IOL value of the SDA output:

RPU = (Vcc – VOL) / IOL

( IOL: see Table 7, page 5, Output Parameters; e.g. 5mA at VCC = 5.0V, with VOL = 0.8V )

SCL

Start

SDA

tBUF

tHD:STA

tLOW

tHD:DAT

tHIGH

tSU:DAT

tSU:STA

tSU:STO

Stop

Figure 8: I2C Timing

10.2

I2C Specification compliance

EM3027 device with I2C serial interface was designed

in compliance with Philips Semiconductors I

2C-bus

specification UM10204 (Rev. 03

– 19 June 2007), Fast-

mode class (up to 400kbit/s). Device address consists

of 7 bits. Clock stretching is not supported.

Brief manual to I2C interface read and write

transmissions is to be found in §7.1.

There are, however, the following discrepancies between

I2C specification and EM3027 interface:

Falling time on SDA driven by EM3027 can be

shorter than 20 + 0.1* CB ns. (CB is total capacitive

load for SDA bus line in pF) In other words, slope

control of falling edges on SDA is missing.

Some timing parameters differ from the original I2C

specification

– refer to Table 13.

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