AP0100CS datasheet(7/73 Pages) ONSEMI

7 / 73 page

AP0100CS/D Rev. 6, Pub. 1/16 EN

©Semiconductor Components Industries, LLC,2016.

AP0100CS HDR: Image Signal Processor (ISP)

System Interfaces

Crystal Usage

As an alternative to using an external oscillator, a crystal may be connected between

EXTCLK and XTAL. Two small loading capacitors and a feedback resistor should be

added, as shown in Figure 4.

Figure 4:

Using a Crystal Instead of an External Oscillator

Rf represents the feedback resistor, an Rf value of 1M is sufficient for AP0100CS. C1 and

C2 are decided according to the crystal or resonator CL specification. In the steady state

of oscillation, CL is defined as (C1 x C2)/(C1+C2). In fact, the I/O ports, the bond pad,

package pin and PCB traces all contribute the parasitic capacitance to C1 and C2. There-

fore, CL can be rewritten to be (C1* x C2*)/(C1*+C2*), where C1*=(C1+Cin, stray) and

C2*=(C2+Cout, stray). The stray capacitance for the IO ports, bond pad and package pin

are known which means the formulas can be rewritten as C1*=(C1+1.5pF+Cin, PCB) and

C2*=(C2+1.3pF+Cout, PCB).

Table 3:

Pin Descriptions

Name

Type

Description

EXTCLK

Input

Master input clock. This can either be a square-wave generated from an

oscillator (in which case the XTAL input must be left unconnected) or direct

connection to a crystal.

XTAL

Output

If EXTCLK is connected to one pin of a crystal, the other pin of the crystal is

connected to XTAL pin; otherwise this signal must be left unconnected.

RESET_BAR

Input/PU

Master reset signal, active LOW. This signal has an internal pull up.

SCLK

Input

Two-wire serial interface clock (host interface).

SDATA

I/O

Two-wire serial interface data (host interface).

SADDR

Input

Selects device address for the two-wire slave serial interface. When connected

to GND the device ID is 0x90. When wired to VDDIO_H, a device ID of 0xBA is

selected.

FRAME_SYNC

Input

This signal is used to synchronize to external sources or multiple cameras

together. This signal should be connected to GND if not used.

STANDBY

Input

Standby mode control, active HIGH.

EXT_REG

Input

Select external regulator if tied high

EXTCLK

XTAL

AP0100CS

Rf=1M

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