Epson Quartz Crystal Devices| For customers designing Texas Instruments "MSP430 series" applications

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For customers designing Texas Instruments "MSP430 series" applications

We are pleased to introduce you to our 32.768kHz crystal unit for F1XX, F2XX and F4XX:

	Items to Confirm (designing of oscillation circuit)
	Selection Guidance for crystal unit
	Crystal Product Lineups
	Oscillation Circuit and Selection Guidance of Crystal Unit (for each MSP430 series)
	Precautions for designing of PCB Board

	Technical note: "The Latest in Low-Frequency Oscillation Circuits!" PDF (600KB)

For product information of "MSP430 series",
please see Texas Instruments' web site.

Please note: to design oscillation circuit for MSP430 series, you need to confirm the electronic characteristics as follows:

Oscillation allowance and Negative resistance (-R):

You need to confirm oscillation capability.
We recommend the condition: (-R) / ESR > 5
* -R: Negative resistance, ESR: Equivalent Series Resistance
Please refer to our web site: http://www.epsontoyocom.co.jp/english/support/index.html

Drive Level:

You need to confirm if oscillation is stable, and if the drive level is within the specification.
Please refer to our web site: http://www.epsontoyocom.co.jp/english/support/index.html

Load Capacitance:

Load capacitance affects frequency stability, oscillation allowance, negative resistance, and start-up time of oscillation.
In addition the load capacitance is determinative factor of crystal unit's load capacitance (CL value) directly.
Please refer to our web site: http://www.epsontoyocom.co.jp/english/support/index.html

* frequency stability: frequency deviation out of circuit conditions.

Please note: There is a trade-off between negative resistance and drive level.

Product	Size [mm]	Applications	Images
MC-306	8×3.8×2.5t	Electronic, Gas, Water meter, Flow meter, Intelligent sensor, Measurement equipment, Blood pressure meter, Blood-sugar monitor, Security systems
MC-146	7×1.5×1.4t	DSC, Consumer equipment, Radio equipment, Blood pressure meter, Blood-sugar monitor, Security systems
FC-135 FC-13F	3.2×1.5×0.8t 3.2×1.5×0.55t	PMP, DSC, Portable equipment
FC-12M	2.0×1.2×0.6t	Portable equipment

Recommendable XTAL for F2XX

XTAL	MC-306	MC-146	FC-135
CL(pF)	Product Code
7	Q13MC30610004	Q13MC14610001	Q13FC13500002
9	Q13MC30610002	Q13MC14610004	Q13FC13500003
12.5	Q13MC30610003	Q13MC14610002	Q13FC13500004

* Product Code: encoded numbers of crystal specifications

Recommendable XTAL for F4XX

XTAL	MC-306	MC-146	FC-135
CL(pF)	Product Code
7	Q13MC30610004	Q13MC14610001	Q13FC13500002
9	Q13MC30610002	Q13MC14610004	Q13FC13500003
12.5	Q13MC30610003	Q13MC14610002	Q13FC13500004

* Product Code: encoded numbers of crystal specifications

Recommendable XTAL for F1XX

XTAL	MC-306	MC-146	FC-135
CL(pF)	Product Code
9	Q13MC30610001	Q13MC14610004	Q13FC13500003

* Product Code: encoded numbers of crystal specifications

<Layout of XIN, XOUT, Crystal unit, Capacitor and Resistor>
-Please lay out crystal unit, capacitor and resistor near MSP430 as far as possible.
-Please connect XIN and XOUT within 20mm length, and do not cross other signal lines.


	If Vcc drops to below 2.5V, insert a resistor of 5.1 ohms between XOUT and GND.

<GND Line Pattern and Interconnection of PCB>
-Please lay out GND line pattern under crystal unit.
-In case of muli-layered PCB board, do not lay out other signal lines under crystal unit.

Cross-seection View(Multi-layered PCB Board)