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MSP430FR6889 Datasheet, PDF (40/176 Pages) Texas Instruments – Mixed-Signal Microcontrollers
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MSP430FR6889, MSP430FR68891, MSP430FR6888, MSP430FR6887
MSP430FR5889, MSP430FR58891, MSP430FR5888, MSP430FR5887
SLASE32A – AUGUST 2014 – REVISED MARCH 2015
www.ti.com
Low-Frequency Crystal Oscillator, LFXT(1) (continued)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
CLFXIN
PARAMETER
Integrated load capacitance at
LFXIN terminal(5) (6)
TEST CONDITIONS
VCC
MIN TYP MAX UNIT
2
pF
CLFXOUT
Integrated load capacitance at
LFXOUT terminal(5) (6)
2
pF
tSTART,LFXT Start-up time(7)
fFault,LFXT
Oscillator fault frequency(8) (9)
fOSC = 32768 Hz,
LFXTBYPASS = 0, LFXTDRIVE = {0},
TA = 25°C, CL,eff = 3.7 pF
fOSC = 32768 Hz,
LFXTBYPASS = 0, LFXTDRIVE = {3},
TA = 25°C, CL,eff = 12.5 pF
3.0 V
3.0 V
800
ms
1000
0
3500 Hz
(5) This represents all the parasitic capacitance present at the LFXIN and LFXOUT terminals, respectively, including parasitic bond and
package capacitance. The effective load capacitance, CL,eff can be computed as CIN x COUT / (CIN + COUT), where CIN and COUT are the
total capacitance at the LFXIN and LFXOUT terminals, respectively.
(6) Requires external capacitors at both terminals to meet the effective load capacitance specified by crystal manufacturers. Recommended
effective load capacitance values supported are 3.7 pF, 6 pF, 9 pF, and 12.5 pF. Maximum shunt capacitance of 1.6 pF. The PCB adds
additional capacitance, so it must also be considered in the overall capacitance. It is recommended to verify that the recommended
effective load capacitance of the selected crystal is met.
(7) Includes start-up counter of 1024 clock cycles.
(8) Frequencies above the MAX specification do not set the fault flag. Frequencies in between the MIN and MAX specification may set the
flag. A static condition or stuck at fault condition will set the flag.
(9) Measured with logic-level input frequency but also applies to operation with crystals.
40
Specifications
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