STA1275 datasheet(92/109 Pages) STMICROELECTRONICS

92 / 109 page

Electrical characteristics

STA1295, STA1275

92/109

DS12586 Rev 5

Figure 12. ADC input equivalent circuit

4.11

Touch Screen Controller (TSC) electrical characteristics

The following table lists the electrical characteristics of the TSC.

Table 47. ADC input equivalent circuit parameters values

Min.

Typ.

Max.

Unit

1.5 K

2 K

2.5 K

Ohm

Farad

1.1 K

1.5 K

1.9 K

Ohm

1.4p

Farad

Zin

—

Ohm

Table 48. Touch screen controller

Symbol

Parameter

Conditions

Min. Typ. Max. Unit

VDDTSC

SR Full scale voltage input span(1)

1. It is the same as ADC voltage reference range.

3.0

3.3

3.6

CIN

Total input capacitance(2)

2. Equivalent to Cp1 + Cp2 + Cs in ADC section.

ILEAK

Input leakage

-2

μA

tSETTLE

Panel settling time(3)

3. Controlled by the Touch Screen Configuration Register (TSCCONFIG).

0.01

100

tTOUCH

Touch detect delay(3)

0.01

RON-P

Y+, X+ drivers on resistance

IOH = -30 mA

RON-N

Y-, X- drivers on resistance

IOL = +30 mA

IPANEL

Panel driver current capability

VTOUCH P

Touch detect comparator threshold(4)

4. Measured as VIH on X+ input.

VDDTSC = 3.0 V

2.1

VTOHYS

Touch detect comparator hysteresis

300

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