STA1085 datasheet(62/127 Pages) STMICROELECTRONICS

Part #	STA1085

Description	Accordo2 family – Automotive dual core processor for car radio and display audio application

PDF	127 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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Electrical Characteristics

STA108x, STA109x

62/127

DS13319 Rev 2

The 24 to 26 MHz oscillator is connected between MXTALI (oscillator amplifier input) and

MXTALO (oscillator amplifier output). It also requires two external load capacitors of CL pF,

as shown in Figure 5.

The specifications of a typical external crystal are shown in Table 27:

Figure 5. 24-26 MHz Crystal Connection

To drive the 24/26 MHz crystal pins from an external clock source:

–

Force Through Mode. Bias MXTALO at 1.25 V. Apply external single ended

square clock at MXTALI. Input clock should be of CMOS level (Low = GND,

High = 2.5 V). Clock is available after OSC startup time.

Table 27. Typical Crystal Recommended Specifications

Symbol

Parameter

Limit values

Unit

Min

Typ

Max

FMXTAL

SR Crystal Frequency

MHz

LMMXTAL, 24MHz XTAL

4.0

CMMXTAL, 24MHz XTAL

10.1

RMMXTAL

Motional Resistance



COMXTAL

Shunt Capacitance

4.0

CLMXTAL

Load Capacitance(1)

1. Total capacitance, including package and board parasitics.

24-26 MHz

Crystal

MXTALI

MXTALO

Device

LMMXTAL RMMXTAL CMMXTAL

COMXTAL

Crystal Model

STA1085 Datasheet(PDF) 62 Page - STMicroelectronics

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