SX8677 datasheet(10/63 Pages) SEMTECH

Part #	SX8677

Description	Haptics Enabled Multitouch 4/5-Wire Resistive Touchscreen Controller with Proximity Sensing

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Manufacturer	SEMTECH [Semtech Corporation]

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ADVANCED COMMUNICATIONS & SENSING

Rev 1 – 25

th July 2011

10

www.semtech.com

SX8677/SX8678

Haptics Enabled Multitouch 4/5-Wire

Resistive Touchscreen Controller with Proximity Sensing

Symbol

Description

Conditions

Min

Typ.

Max

Unit

Reset

VPOR

Power-On-Reset voltage

Cf. §10

-

1.3

-

V

tRESET

Reset time after POR

Cf. §10

-

1

ms

tPULSE

Reset pulse from host uC

Cf. §10

1

-

us

I2C Interface

fSCL

SCL clock frequency

-

400

kHz

tHD;STA

Hold time (repeated) START

condition

-

0.6

-

µs

tLOW

LOW period of the SCL clock

-

1.3

-

µs

tHIGH

HIGH period of the SCL clock

-

0.6

-

µs

tSU;STA

Set-up time for a repeated

START condition

-

0.6

-

µs

tHD;DAT

Data hold time

-

0

-

µs

tSU;DAT

Data set-up time

-

100

-

ns

tr

Rise time of both SDA and SCL

-

20+0.1Cb

-

300

ns

tf

Fall time of both SDA and SCL

-

20+0.1Cb

-

300

ns

tSU;STO

Set-up time for STOP condition

-

0.6

-

µs

tBUF

Bus free time between a STOP

and START condition

-

1.3

-

µs

Cb

Capacitive load for each bus line

-

400

pF

tSP

Pulse width of spikes

suppressed by the input filter

Up to 0.3xVDD from

GND, down to 0.7xVDD

from VDD

50

-

ns

Miscellaneous

FOSCL

Low frequency internal oscillator

-

32

-

kHz

FOSCH

High frequency internal oscillator

-

1.8

-

MHz

(1)

Guaranteed by design.

(2)

PWM mode can introduce an additional error of 2.5% of full scale.

Table 4 – Electrical Specifications

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