ADS7924 datasheet(5/42 Pages) TI

Part #	ADS7924

Description	2.2V, 12-Bit, 4-Channel, microPOWER??ANALOG-TO-DIGITAL CONVERTER WITH I2C INTERFACE

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SCL

SDA

t

R

t

HDSTA

t

HDSTA

t

HDDAT

t

BUF

t

HIGH

t

SUSTA

t

SUSTO

P

S

Sr

P

t

SP

t

VDACK

t

SUDAT

9thClock

t

VDDAT

t

F

t

LOW

ADS7924

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SBAS482A – JANUARY 2010 – REVISED MAY 2010

TIMING DIAGRAM

NOTE: S = Start, Sr = Repeated Start, and P = Stop.

Figure 1. I2C Timing Diagram

Table 1. I2C Timing Definitions

ADS7924

PARAMETER

MIN

MAX

UNIT

SCL operating frequency

fSCL

0

0.4

MHz

Bus free time between START and STOP condition

tBUF

1.3

ms

Hold time after repeated START condition.

tHDSTA

600

ns

After this period, the first clock is generated.

Repeated START condition setup time

tSUSTA

600

ns

Stop condition setup time

tSUSTO

600

ns

Data hold time

tHDDAT

0

ns

Data setup time

tSUDAT

100

ns

SCL clock low period

tLOW

1300

ns

SCL clock high period

tHIGH

600

ns

Clock/data fall time

tF

300

ns

Clock/data rise time

tR

300

ns

Data valid time

tVDDAT

0.9

ms

Data valid acknowledge time

tVDACK

0.9

ms

Pulse width of spike that must be suppressed by the input filter

tSP

0

50

ns

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