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MSP430F543X_1 Datasheet, PDF (49/90 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER
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MSP430F543x, MSP430F541x
MSP430F543xA, MSP430F541xA
www.ti.com.......................................................................................................................................................................................... SLAS612 – SEPTEMBER 2008
Crystal Oscillator, XT2 (continued)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
OAHF
Oscillation allowance for
HF crystals(5)
tSTART,HF Startup time
CL,eff
Duty cycle
fFault,HF
Integrated effective load
capacitance, HF mode(6)(1)
Oscillator fault frequency(7)
TEST CONDITIONS
XT2DRIVEx = 0, XT2BYPASS = 0,
fXT2,HF0 = 6 MHz, CL,eff = 15 pF
XT2DRIVEx = 1, XT2BYPASS = 0,
fXT2,HF1 = 12 MHz, CL,eff = 15 pF
XT2DRIVEx = 2, XT2BYPASS = 0,
fXT2,HF2 = 20 MHz, CL,eff = 15 pF
XT2DRIVEx = 3, XT2BYPASS = 0,
fXT2,HF3 = 32 MHz, CL,eff = 15 pF
fOSC = 6 MHz
XT2BYPASS = 0, XT2DRIVEx = 0,
TA = 25°C,
CL,eff = 15 pF
fOSC = 20 MHz
XT2BYPASS = 0, XT2DRIVEx = 3,
TA = 25°C,
CL,eff = 15 pF
VCC
3.0 V
Measured at ACLK, fXT2,HF2 = 20 MHz
XT2BYPASS = 1(8)
MIN TYP MAX UNIT
450
320
Ω
200
200
0.5
ms
0.3
1
pF
40
50
60 %
30
300 kHz
(5) Oscillation allowance is based on a safety factor of 5 for recommended crystals.
(6) Includes parasitic bond and package capacitance (approximately 2 pF per pin).
Since the PCB adds additional capacitance, it is recommended to verify the correct load by measuring the ACLK frequency. For a
correct setup, the effective load capacitance should always match the specification of the used crystal.
(7) Frequencies below the MIN specification set the fault flag. Frequencies above the MAX specification do not set the fault flag.
Frequencies in between might set the flag.
(8) Measured with logic-level input frequency but also applies to operation with crystals.
Internal Very-Low-Power Low-Frequency Oscillator (VLO)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
fVLO
VLO frequency
dfVLO/dT VLO frequency temperature drift
dfVLO/dVCC VLO frequency supply voltage drift
Duty cycle
TEST CONDITIONS
Measured at ACLK
Measured at ACLK(1)
Measured at ACLK(2)
Measured at ACLK
VCC
1.8 V to 3.6 V
1.8 V to 3.6 V
1.8 V to 3.6 V
1.8 V to 3.6 V
MIN TYP
6 9.4
0.5
4
40
50
(1) Calculated using the box method: (MAX(-40 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85°C) / (85°C – (–40°C))
(2) Calculated using the box method: (MAX(1.8 to 3.6 V) – MIN(1.8 to 3.6 V)) / MIN(1.8 to 3.6 V) / (3.6 V – 1.8 V)
MAX
14
60
UNIT
kHz
%/°C
%/V
%
Internal Reference, Low-Frequency Oscillator (REFO)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
IREFO
fREFO
dfREFO/dT
dfREFO/dVCC
Duty cycle
tSTART
PARAMETER
TEST CONDITIONS
REFO oscillator current consumption TA = 25°C
REFO frequency calibrated
Measured at ACLK
REFO absolute tolerance calibrated
REFO frequency temperature drift
REFO frequency supply voltage drift
Full temperature range
TA = 25°C
Measured at ACLK(1)
Measured at ACLK(2)
Measured at ACLK
REFO startup time
40%/60% duty cycle
VCC
1.8 V to 3.6 V
1.8 V to 3.6 V
1.8 V to 3.6 V
3V
1.8 V to 3.6 V
1.8 V to 3.6 V
1.8 V to 3.6 V
1.8 V to 3.6 V
MIN TYP
3
32768
0.01
1.0
40
50
25
(1) Calculated using the box method: (MAX(-40 to 85°C) – MIN(-40 to 85°C)) / MIN(-40 to 85°C) / (85°C – (–40°C))
(2) Calculated using the box method: (MAX(1.8 to 3.6 V) – MIN(1.8 to 3.6 V)) / MIN(1.8 to 3.6 V) / (3.6 V – 1.8 V)
MAX
±3.5
±1.5
60
UNIT
µA
Hz
%
%
%/°C
%/V
%
µs
Copyright © 2008, Texas Instruments Incorporated
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