TNETV2685FIBZUT7 datasheet(136/191 Pages) TI1

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Stop

Start

Repeated

Start

Stop

SDA

SCL

TMS320DM647

TMS320DM648

SPRS372H – MAY 2007 – REVISED APRIL 2012

www.ti.com

6.15.2 I2C Electrical Data/Timing

6.15.2.1 Inter-Integrated Circuits (I2C) Timing

Table 6-63. Timing Requirements for I2C Timings(1) (see Figure 6-38)

720, 800, 900, 1100

STANDARD

NO.

FAST MODE

UNIT

MODE

MIN

MAX

MIN

MAX

tc(SCL)

Cycle time, SCL

2.5

µs

Setup time, SCL high before SDA low (for a repeated START

tsu(SCLH-SDAL)

4.7

0.6

µs

condition)

Hold time, SCL low after SDA low (for a START and a repeated

th(SCLL-SDAL)

0.6

µs

START condition)

tw(SCLL)

Pulse duration, SCL low

4.7

1.3

µs

tw(SCLH)

Pulse duration, SCL high

0.6

µs

tsu(SDAV-SCLH)

Setup time, SDA valid before SCL high

250

100(2)

th(SDA-SCLL)

Hold time, SDA valid after SCL low

0(3)

0(3) 0.9(4)

µs

tw(SDAH)

Pulse duration, SDA high between STOP and START conditions

4.7

1.3

µs

tr(SDA)

Rise time, SDA

1000 20 + 0.1Cb

(5)

300

tr(SCL)

Rise time, SCL

1000 20 + 0.1Cb

(5)

300

tf(SDA)

Fall time, SDA

300 20 + 0.1Cb

(5)

300

tf(SCL)

Fall time, SCL

300 20 + 0.1Cb

(5)

300

tsu(SCLH-SDAH)

Setup time, SCL high before SDA high (for STOP condition)

0.6

µs

tw(SP)

Pulse duration, spike (must be suppressed)

(5)

Capacitive load for each bus line

400

(1)

The I2C pins SDA and SCL do not feature fail-safe I/O buffers. These pins could potentially draw current when the device is powered

down.

(2)

A Fast-mode I2C-bus™ device can be used in a standard-mode I2C-bus system, but the requirement tsu(SDA-SCLH)≥ 250 ns must then be

met. This will be the case automatically 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(SDA-SCLH)= 1000 + 250 = 1250 ns

(according to the Standard-mode I2C-Bus Specification) before the SCL line is released.

(3)

A device must internally provide a hold time of at least 300 ns for the SDA signal (referred to the VIHmin of the SCL signal) to bridge the

undefined region of the falling edge of SCL.

(4)

The maximum th(SDA-SCLL) has to be met only if the device does not stretch the low period [tw(SCLL)] of the SCL signal.

(5)

Cb = total capacitance of one bus line in pF. If mixed with HS-mode devices, faster fall-times are allowed.

Figure 6-38. I2C Receive Timings

136

Peripheral Information and Electrical Specifications

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