Electronic Components Datasheet Search |
|
EM3027SDSTP14B Datasheet(PDF) 8 Page - EM Microelectronic - MARIN SA |
|
EM3027SDSTP14B Datasheet(HTML) 8 Page - EM Microelectronic - MARIN SA |
8 / 28 page R EM3027 Copyright © 2009, EM Microelectronic-Marin SA 12/09 – rev D 8 www.emmicroelectronic.com 4.4 Crystal Calibration In order to compensate temperature dependency of the used crystal, correct values of XtalOffset, Qcoef and TO parameters shall be stored in EEPROM Control Page. User is advised to follow these steps in order to compute the parameters in a correct way: 1) Supply the chip from VCC pin. 2) Set FD0 = FD1 = ‘0’. Set CLKOE pin to ’1’. This provides the uncompensated frequency signal from the crystal oscillator directly on pin CLKOUT. 3) Measure output frequency fO at different temperatures (at least five measurements in equidistant points in the whole desired temperature range are recommended). Please note that quartz crystal needs few minutes to stabilise its frequency at a given temperature. 4) Compute frequency deviation ferr of output frequency fo from the ideal (target) frequency fL = 32.768Hz in all measured points as follows: ferr = (fo-fL)/fo . 5) Find a quadratic regression of the measured dependency in form: ferr = -c1(T – c2) 2 + c3 or fO = aT2 + bT + c. 6) Then real values of the searched parameters can be obtained from the following relations: Qcoefreal = c1 = -a, T0_real = c2 = -b/(2a), XtalOffsetreal = c3 = c – b 2/(4a). 7) The values to be stored in EEPROM Control Page have to be corrected in the following way: Qcoef = 4096*(1.05*Qcoefreal), T0 = T0_real - 4, XtalOffset = 1.05*XtalOffsetreal. |
Similar Part No. - EM3027SDSTP14B |
|
Similar Description - EM3027SDSTP14B |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |