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PixArt Imaging Inc.

ADBS-A350 General Datasheet

Optical Finger Navigation Chip

ADBS-A350 General Datasheet

Optical Finger Navigation Chip

PixArt Imaging Inc. http://www.pixart.com

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Version 1.0 |22 Jan 2016 | 11010AEN

Two – Wire Interface (TWI)

ADBS-A350 uses a two-wire serial control interface compatible with I2C. The parameters are listed below.

TWI Specifications

Electrical Characteristics over recommended operating conditions. Typical values at 25° C, VDD = 1.8 V.

Parameter

Symbol

Minimum Maximum Units Notes

SCL clock frequency

fscl

400

kHz

Hold time (repeated) START condition. After this

period, the first clock pulse is generated

tHD_STA

0.6

–

µs

LOW period of the SCL clock

tLOW

1.0

–

µs

HIGH period of the SCL clock

tHIGH

0.6

–

µs

Set up time for a repeated START condition

tSU_STA

0.6

–

µs

Data hold time

tHD_DAT

0(2)

0.9(3)

µs

Data set-up time

tSU_DAT

100

–

ns

Rise time of both SDA and SCL signals

tr

300

ns

Fall time of both SDA and SCL signals

tf

300

ns

Set up time for STOP condition

tSU_STO

0.6

–

µs

Bus free time between a STOP and START

condition

tBUF

1.3

–

µs

Capacitive load for each bus line

Cb

–

400

pF

Notes:

1. All values referred to VIHMIN and VILMAX levels.

2. 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.

3. The maximum has tHD_DAT only to be met if the device does not stretch the LOW period (tLOW) of the SCL

signal.

4. CB = total capacitance of one bus line in pF.