PCIMX258CJM4A datasheet(110/144 Pages) FREESCALE

110 / 144 page

i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 3

110

Freescale Semiconductor

• ”Tx” and “Rx” refer, respectively, to the transmit and receive sections of the SSI.

• For internal frame sync operation using external clock, the FS timing is the same as that of Tx data (for example, during AC97

mode of operation).

3.7.18

Touchscreen ADC Electrical Specifications and Timing

This section describes the electrical specifications, operation modes, and timing of the touchscreen ADC.

3.7.18.1

ADC Electrical Specifications

Table 83 shows the electrical specifications for the touchscreen ADC.

Table 83. Touchscreen ADC Electrical Specifications

Parameter

Conditions

Min.

Typ.

Max.

Unit

ADC

Input sampling

capacitance (

CS)

No pin/pad capacitance included

—

Resolution

—

bits

Analog Bias

Resistance value

between

ref and agndref

——

1.6

—

Timing Characteristics

Sampling rate (fs)

—

125

kHz

Internal ADC/TSC clock

frequency

——

—

1.75

MHz

Multiplexed inputs

—

Data latency

—

12.5

clk

cycles

Power-up time1

—14

clk

cycles

clk falling edge to

sampling delay (tsd)

—2

soc input setup time

before clk rising edge

(tsocst)

—0.5

soc input hold time after

clk rising edge (tsochld)

—2

eoc delay after clk rise

edge (teoc)

With a 250fF load

Valid data out delay after

eoc rise edge (tdata)

With a 250fF load

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