For customers designing Texas Instruments
"MSP430 Family" applications

We are pleased to introduce you to our 32.768kHz crystal unit for MSP430 Family.

For product information of "MSP430 Family", please refer to Texas Instruments web site.

Items to Confirm (designing of oscillation circuit)

Please note: to design oscillation circuit for MSP430 Family, 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://epsondevice.com/cn/information/precaution/design.html
Support information > Precautions in Designing oscillation circuits > 2. Allowance for oscillation

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://epsondevice.com/cn/information/precaution/design.html
Support information > Precautions in Designing oscillation circuits > 1. Drive level

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://epsondevice.com/cn/information/precaution/design.html
Support information > Precautions in Designing oscillation circuits > 3. Load capacitance

* frequency stability: frequency deviation out of circuit conditions.

Selection Guidance for crystal unit

When Customer selects crystal unit, load capacitance (CL value) is an important factor of the selection.
For instance, crystal with small CL(7.0 pF) makes larger oscillation allowance, smaller current consumption and worse frequency stability,
like below table. Oppositely, crystal with large CL(12.5 pF) makes smaller oscillation allowance, larger current consumption and better frequency stability.
Please select it in consideration of these characteristics.

Selection Guidance for crystal unit

Epson Crystal Product Lineups

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
MC306
MC-146 7×1.5×1.4t DSC, Consumer equipment, Radio equipment, Blood pressure meter,
Blood-sugar monitor, Security systems
MC146
FC-135
FC-135R
3.2×1.5×0.8t
PMP, DSC, Portable equipment FC135
FC-12M 2.0×1.2×0.6t Portable equipment FC12M

Oscillation Circuit and Selection Guidance of Crystal Unit (for each MSP430 Family)

For MSP430 FR5xx series

MSP430 FR5xxx crystal oscillator setting and equivalent crystal CL values

LFXTDRIVE value Crystal unit
equivalent CL values
(pF)
32.768 kHz Crystal Product Code
CL
(pF)
FC-135R FC-135 MC-146 MC-146L
LFXTDRIVE
=0
3.7 3.7 - - - Go to Low CL page
LFXTDRIVE
=1
6 to 9 7 X1A0001410001 Q13FC13500002 Q13MC14620001 -
9 X1A0001410002 Q13FC13500003 Q13MC14620004 -
LFXTDRIVE
=2
6 to 10 7 X1A0001410001 Q13FC13500002 Q13MC14620001 -
9 X1A0001410002 Q13FC13500003 Q13MC14620004 -
LFXTDRIVE
=3
6 to 12 7 X1A0001410001 Q13FC13500002 Q13MC14620001 -
9 X1A0001410002 Q13FC13500003 Q13MC14620004 -

F5xx,F6xx

Pin number of LFXIN/ LFXOUT for MSP430 FR58xx,FR59xx

LFXIN LFXOUT PKG
45 46 RGZ
37 38 RHA
1 2 DA

(in RHA and DA: MSP430FR594x and MSP430FR584x devices only)


Product
name
CL
[pF]
Product Code LFXDRIVE External parts Package size
WxDxH[mm]
Cg[pF] Cd[pF]
FC-135R 7 X1A0001410001 1 12 10 3.2x1.5x0.80
2 12 10
3 12 10
9 X1A0001410002 1 15 15
2 15 15
3 15 15
FC-135 7 Q13FC13500002 1 12 10 3.2x1.5x0.80
2 12 10
3 12 10
9 Q13FC13500003 2 15 15
3 15 15
MC-146 7 Q13MC14620001 1 12 10 7.0x1.5x1.40
2 12 10
3 12 10
2 15 15
9 Q13MC14620004 3 15 15
MC-146L 3.7 Go to Low CL page 0 4 4 7.0x1.5x1.40

For MSP430 F5xx series

F5xx,F6xx

Pin number of XIN/ XOUT for MSP430F5310,F5309,F5308,F5304

XIN XOUT PKG
12 13 RGC
8 9 RGZ,PT
F1 G1 ZQE

Epson Product XCAPx
Product
name
CL
[pF]
Product Code Package size
WxDxH[mm]
Value CL
[pF]
FC-135 9 Q13FC13500003 3.2x1.5x0.80 1 5.5
3 12
FC-12M 9 X1A0000610008 2.05x1.2x0.6 2 8.5
3 12

Oscillation Circuit and Selection Guidance of Crystal Unit for MSP430 F5xx/F6xx
F5xx
Customer can use the crystal unit CG and CD due a result of evaluation of circuit board.

MSP430 F5xx/F6xx crystal oscillator setting and equivalent crystal CL values

XCAPx value
(integrated effective load)
Crystal unit
equivalent CL valuesCL
(pF)
32.768 kHz Crystal Product Code
CL
(pF)
MC-306 MC-146 FC-135
XCAPx=0
(2 pF Typ.)
External capacitors are required --- Customer can select crystal products
with external capacitor combination
XCAPx=1
(5.5pF typ.)
7 7 Q13MC30610004 Q13MC14620001 Q13FC13500002
XCAPx=2
(8.5pF typ.)
12.5 12.5 Q13MC30610003 Q13MC14620002 Q13FC13500004
XCAPx=3
default(12pF typ.)
--- --- --- --- ---

* Product Code: encoded numbers of crystal specifications

Remarks:
By tuning MSP430F5xx/F6xx XT1DRIVE, oscillation allowance and current consumption will be controlled.

Notes:
Please refer to Texas Instruments MSP430 manual for setting XCAPx and other parameters.

For MSP430 F2xx/F4xx/G2xx/AFE series

F2xx
Customer can use the crystal unit CG and due to a result of evaluation of circuit board.

MSP430 F2xx/F4xx/G2xx/AFE series crystal oscillator setting and equivalent crystal CL values

XCAPx value
(integrated effective load)
Crystal unit
equivalent CL values
(pF)
32.768 kHz Crystal Product Code
CL
(pF)
MC-306 MC-146 FC-135
XCAPx=0
(1 pF Typ.)
External capacitors are required --- Customer can select crystal products
with external capacitor combination.
XCAPx=1
(5.5pF typ.)
9 9 Q13MC30610002 Q13MC14620004 Q13FC13500003
XCAPx=2
(8.5pF typ.)
12.5 12.5 Q13MC30610003 Q13MC14620002 Q13FC13500004
XCAPx=3
default
(11pF typ.)
--- --- --- --- ---

* Product Code: encoded numbers of crystal specifications

Recommended Crystal CL values and MSP430 F2xx/F4xx/G2xx/AFE XCAPx setting

No. Crystal CL Value
(pF)
XCAP value
(integrated effective load typ.)
Advantage Drawback
1 12.5 XCAPx=2 (8.5pF) High frequency stability Higher current consumption,
slower oscillation startup.
2 9 XCAPx=1 (5.5pF) Low current consumption Lower stability due to load capacitance variation of
external components and the layout.

For customer required to follow XOSC8 Guidance, crystal products with high ESR are available. here
Texas Instruments Application Report XOSC8 Guidance pdf

Notes:
Please refer to Texas Instruments MSP430 manual for setting XCAPx and other parameters.

* Product Code: encoded numbers of crystal specifications

For MSP430 F1xx series

F1xx

Recommendation for MSP430 F1xx series

Crystal unit equivalent CL values
(pF)
32.768 kHz Crystal Product Code
MC-306 MC-146 FC-135
9 Q13MC30610002 Q13MC14620004 Q13FC13500003

Notes

  1. Above recommendations are based on actual evaluation results and intended to support users in picking the right components. And the results are only according to the sample set that received from our customers, so it is not including the dispersion trend of IC and the external parts.
  2. As the actual board layout and choice of external components influences the best suitable crystal load capacitance, We do not assume any responsibility and grant warranty for above recommendations.
  3. Users design must be verified and decided by own and individual evaluation.

Precautions for designing of PCB Board

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 20 mm length, and do not cross other signal lines.

For 32kHz crystal unit
TOP View
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 multi-layered PCB board, do not lay out other signal lines under crystal unit.

Cross-seection View(Multi-layered PCB Board)

Crystal Products for Texas Instruments Application Report XOSC8 Guidance

Customer can select 32.768 kHz Crystal Products from table below.

Crystal unit equivalent CL values
(pF)
32.768 kHz Crystal Product Code
FC-135
7 Q13FC13500002
9 Q13FC13500003
12.5 Q13FC13500004

* Product Code: encoded numbers of crystal specifications

Texas Instruments Application Report XOSC8 Guidance pdf

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