Datasheet

MSP430BT5190
www.ti.com SLAS703A –APRIL 2010–REVISED AUGUST 2013
Crystal Oscillator, XT2 (continued)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
(1) (2)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
XT2DRIVEx = 0, XT2BYPASS = 0,
450
f
XT2,HF0
= 6 MHz, C
L,eff
= 15 pF
XT2DRIVEx = 1, XT2BYPASS = 0,
320
f
XT2,HF1
= 12 MHz, C
L,eff
= 15 pF
Oscillation allowance for
OA
HF
Ω
HF crystals
(5)
XT2DRIVEx = 2, XT2BYPASS = 0,
200
f
XT2,HF2
= 20 MHz, C
L,eff
= 15 pF
XT2DRIVEx = 3, XT2BYPASS = 0,
200
f
XT2,HF3
= 32 MHz, C
L,eff
= 15 pF
f
OSC
= 6 MHz
XT2BYPASS = 0, XT2DRIVEx = 0, 0.5
T
A
= 25°C, C
L,eff
= 15 pF
t
START,HF
Startup time 3 V ms
f
OSC
= 20 MHz
XT2BYPASS = 0, XT2DRIVEx = 2, 0.3
T
A
= 25°C, C
L,eff
= 15 pF
Integrated effective load
C
L,eff
1 pF
capacitance, HF mode
(6) (1)
Duty cycle Measured at ACLK, f
XT2,HF2
= 20 MHz 40 50 60 %
f
Fault,HF
Oscillator fault frequency
(7)
XT2BYPASS = 1
(8)
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).
Because 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 between the MIN and MAX 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 TEST CONDITIONS V
CC
MIN TYP MAX UNIT
f
VLO
VLO frequency Measured at ACLK 1.8 V to 3.6 V 6 9.4 14 kHz
df
VLO
/d
T
VLO frequency temperature drift Measured at ACLK
(1)
1.8 V to 3.6 V 0.5 %/°C
df
VLO
/dV
CC
VLO frequency supply voltage drift Measured at ACLK
(2)
1.8 V to 3.6 V 4 %/V
Duty cycle Measured at ACLK 1.8 V to 3.6 V 40 50 60 %
(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)
Internal Reference, Low-Frequency Oscillator (REFO)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS V
CC
MIN TYP MAX UNIT
I
REFO
REFO oscillator current consumption T
A
= 25°C 1.8 V to 3.6 V 3 µA
REFO frequency calibrated Measured at ACLK 1.8 V to 3.6 V 32768 Hz
f
REFO
Full temperature range 1.8 V to 3.6 V ±3.5
REFO absolute tolerance calibrated %
T
A
= 25°C 3 V ±1.5
df
REFO
/d
T
REFO frequency temperature drift Measured at ACLK
(1)
1.8 V to 3.6 V 0.01 %/°C
df
REFO
/dV
CC
REFO frequency supply voltage drift Measured at ACLK
(2)
1.8 V to 3.6 V 1.0 %/V
Duty cycle Measured at ACLK 1.8 V to 3.6 V 40 50 60 %
t
START
REFO startup time 40%/60% duty cycle 1.8 V to 3.6 V 25 µs
(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)
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