MSP430 series chips generally have two crystal oscillators: one main frequency crystal oscillator, usually selected from 4~16Mhz; the other clock crystal oscillator, that is, 32.768Khz crystal oscillator, which was originally selected for in-line package, and now mostly used in patch package. The product is easy to put on the second, and the second is to pursue the stability of the product and the reliability of the quality.
Main frequency crystal oscillator selectionGenerally, the main frequency crystal oscillator of the MSP430 chip generally selects an integral multiple of 4Mhz, that is, 4Mhz, 8Mhz, 16Mhz, 32Mhz, and the like. In the early circuit design, the lower cost 49S package product was generally selected. At this stage, the 3260 package product with better stability, smaller size and easy placement is more and more popular. The vacuum company introduced the DSX321G and DSX320G\DSX320GE products.
1. For industrial grade and consumer products, use DSX321G 8Mhz, as shown below:
This model is 3.2mm*2.5mm, the volume is less than 1/5 of the traditional in-line 49S package, the precision can reach 20PPM, and the working temperature reaches -40-+85°C. It can fully meet the customer's requirements. .
2. DSX320G/DSX320GE for automotive electronics and industrial control products,
This type of product package is approved to be 3.2*2.5mm, and the precision can be 100ppm and 50ppm. In addition to the temperature to meet the customer's requirements of -40-+125 °C, -40-+150 °C, it also meets the AEC-Q200 standard.
32.768Khz clock crystal selectionThe 32.768Khz family has many models, various in-line and patch, various load capacitors and various precisions. Do a specific recommendation based on the different series of MSP430:
IC name Quartz crystal CL(pF)
MSP430F169 32.768kHz 12.5
MSP430F2131 32.768kHz 12.5
MSP430F2131 32.768kHz 6
MSP430F413 32.768kHz 12.5
MSP430F413 32.768kHz 6
MSP430FG4619 32.768kHz 12.5
MSP430FG4619 32.768kHz 6
MSP430F1232IPW 32.768kHz 12.5
MSP430F1XX 32.768kHz 12.5
MSP430F2XX 32.768kHz 12.5
MSP430F4XX 32.768kHz 12.5
MSP430F4XX 32.768kHz 12.5
MSP430F5XX 32.768kHz 12.5
MSP430FE427 32.768kHz 6
MSP430P325 32.768kHz 6
1. Low load, low ESR value products:
In-line package DT-26 32.768Khz 20PPM 6PF
SMD package DMX-26S 32.768Khz 20PPM 6PF
Chip package NX3215SA 32.768Khz 20PPM 6PF
2. Conventional load products:
In-line package DT-26 32.768Khz 20PPM 12.5PF
SMD package DMX-26S 32.768Khz 20PPM 12.5PF
SMD package NX3215SA 32.768Khz 20PPM 12.5PF
Crystal temperature
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