Electrical Characteristics

Preliminary—Subject to Change Without Notice

Freescale Semiconductor

21

5.6.1

Gain Calculations

The ideal mapping of input voltage to output digital sample is defined as follows:

Figure 9. Gain Calculations

In general, the mapping function is:

S = G * V

Eqn. 4

Where V is input, S is output, and G is the slope.

-1

Eqn. 5

5.7

External Interface Timing Specifications

5.7.1

FlexBus

A multi-function external bus interface called FlexBus is provided with basic functionality to interface to slave-only devices up

to a maximum bus frequency of 66MHz. It can be directly connected to asynchronous or synchronous devices such as external

boot ROMs, flash memories, gate-array logic, or other simple target (slave) devices with little or no additional circuitry. For

asynchronous devices a simple chip-select based interface can be used.

Multiplexer Settling Time

cycles

Gain Error

GE

–4

4

lsb1

Offset Error

OE

–2

2

lsb1

Input Capacitance

34

pF

Input Leakage Current

uA

Input Current (Touchscreen enable)

uA

1

lsb: least significant bit

Table 12. ASP Electrical Characteristics (continued)

Characteristic

Symbol

Min

Max

Unit

Vi

Sample

4095

3300

0

2480