AS3722 datasheet(83/198 Pages) AMSCO

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ams Datasheet

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[v1-01] 2015-Sep-07

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AS3722 − Detailed Descriptions- System Functions

Figure 79:

I2C Current Address Read

I2C Current Address Read: Shows the format of an I2C current address read access.

To keep the access time as small as possible, this format allows

a read access without the word address transfer in advance to

the data transfer. The bus is idle and the master issues a START

condition followed by the Device-Read address. Analogous to

Random Read, a single byte transfer is terminated with a

not-acknowledge after the 1st register byte. Analogous to

Sequential Read an unlimited number of data bytes can be

transferred, where the data bytes has to be responded with an

acknowledge from the master. For termination of the

transmission the master sends a not-acknowledge following

the last data byte and a subsequent STOP condition.

I2C Parameter

Figure 80:

I2C Characteristics

I2C Characteristic: Shows the key electrical parameter of the I2C interface.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VIL

SCL,SDA Low Level input voltage

-0.3

0.4

VIH

SCL,SDA High Level input voltage

1.4

VSUP_

GPIO

VOH

High-Level Output Voltage

at -2.0mA

0.8x

VDD_

GPIO_lv

VOL

Low-Level Output Voltage

at 2.0mA

0.2x

VDD_

GPIO_lv

CLOAD

Capacitive Load

FS mode

400

HS mode

100

RPULLUP

Internal pull-up to VDD_GPIO_lv

SCL, SDA =2V,

VDD_GPIO_LV=3V

1.5

2.9

kΩ

external pull-up

HS mode

kΩ

A data 1 A data 2 A

...

data n

RA++

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