MCIMX25 Motorola Semiconductor Products, MCIMX25 Datasheet - Page 108

• Manufacturer Part Number: MCIMX25
• Manufacturer: Motorola Semiconductor Products

3.6.18
This section describes the electrical specifications, operation modes, and timing of the touchscreen ADC.
3.6.18.1
Table 81
108
Input sampling
capacitance ( C
Resolution
Resistance value
between ref and agndref
Sampling rate (fs)
Internal ADC/TSC clock
frequency
Multiplexed inputs
Data latency
Power-up time
clk falling edge to
sampling delay (tsd)
soc input setup time
before clk rising edge
(tsocst)
soc input hold time after
clk rising edge (tsochld)
eoc delay after clk rise
edge (teoc)
Valid data out delay after
eoc rise edge (tdata)
• ”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).
Parameter
shows the electrical specifications for the touchscreen ADC.
Touchscreen ADC Electrical Specifications and Timing
1
S
ADC Electrical Specifications
)
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 2
No pin/pad capacitance included
With a 250fF load
With a 250fF load
Table 81. Touchscreen ADC Electrical Specifications
Conditions
Timing Characteristics
—
—
—
—
—
—
—
—
—
—
Analog Bias
ADC
Min.
0.5
—
—
—
—
2
2
2
5
12.5
Typ.
12
1.6
14
—
—
8
2
5
1
3
7
8
Freescale Semiconductor
Max.
1.75
125
10
13
—
—
8
3
6
cycles
cycles
Unit
MHz
kHz
bits
k
clk
clk
pF
—
ns
ns
ns
ns
ns