參數(shù)資料
型號(hào)： MSP430BT5190IZQW
廠(chǎng)商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 微控制器/微處理器
英文描述： RISC MICROCONTROLLER, PBGA113
封裝： LEAD FREE, PLASTIC, BGA-113
文件頁(yè)數(shù)： 41/97頁(yè)
文件大?。?/td> 724K
代理商： MSP430BT5190IZQW
PRODUCTPREVIEW
MSP430BT5190
SLAS703 – APRIL 2010
www.ti.com
Crystal Oscillator, XT1, Low-Frequency Mode
(1)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VCC
MIN
TYP
MAX
UNIT
fOSC = 32768 Hz, XTS = 0,
XT1BYPASS = 0, XT1DRIVEx = 1,
0.075
TA = 25°C
Differential XT1 oscillator crystal
fOSC = 32768 Hz, XTS = 0,
ΔIDVCC.LF
current consumption from lowest
XT1BYPASS = 0, XT1DRIVEx = 2,
3.0 V
0.170
A
drive setting, LF mode
TA = 25°C
fOSC = 32768 Hz, XTS = 0,
XT1BYPASS = 0, XT1DRIVEx = 3,
0.290
TA = 25°C
XT1 oscillator crystal frequency,
fXT1,LF0
XTS = 0, XT1BYPASS = 0
32768
Hz
LF mode
XT1 oscillator logic-level
fXT1,LF,SW
square-wave input frequency,
XTS = 0, XT1BYPASS = 1(2) (3)
10
32.768
50
kHz
LF mode
XTS = 0,
XT1BYPASS = 0, XT1DRIVEx = 0,
210
fXT1,LF = 32768 Hz, CL,eff = 6 pF
Oscillation allowance for
OALF
k
LF crystals(4)
XTS = 0,
XT1BYPASS = 0, XT1DRIVEx = 1,
300
fXT1,LF = 32768 Hz, CL,eff = 12 pF
XTS = 0, XCAPx = 0(6)
2
XTS = 0, XCAPx = 1
5.5
Integrated effective load
CL,eff
pF
capacitance, LF mode(5)
XTS = 0, XCAPx = 2
8.5
XTS = 0, XCAPx = 3
12.0
XTS = 0, Measured at ACLK,
Duty cycle
LF mode
30
70
%
fXT1,LF = 32768 Hz
Oscillator fault frequency,
fFault,LF
XTS = 0(8)
10
10000
Hz
LF mode(7)
fOSC = 32768 Hz, XTS = 0,
XT1BYPASS = 0, XT1DRIVEx = 0,
1000
TA = 25°C,
CL,eff = 6 pF
tSTART,LF
Startup time, LF mode
3.0 V
ms
fOSC = 32768 Hz, XTS = 0,
XT1BYPASS = 0, XT1DRIVEx = 3,
500
TA = 25°C,
CL,eff = 12 pF
(1)
To improve EMI on the XT1 oscillator, the following guidelines should be observed.
(a) Keep the trace between the device and the crystal as short as possible.
(b) Design a good ground plane around the oscillator pins.
(c) Prevent crosstalk from other clock or data lines into oscillator pins XIN and XOUT.
(d) Avoid running PCB traces underneath or adjacent to the XIN and XOUT pins.
(e) Use assembly materials and praxis to avoid any parasitic load on the oscillator XIN and XOUT pins.
(f) If conformal coating is used, ensure that it does not induce capacitive/resistive leakage between the oscillator pins.
(2)
When XT1BYPASS is set, XT1 circuits are automatically powered down. Input signal is a digital square wave with parametrics defined in
the Schmitt-trigger Inputs section of this datasheet.
(3)
Maximum frequency of operation of the entire device cannot be exceeded.
(4)
Oscillation allowance is based on a safety factor of 5 for recommended crystals. The oscillation allowance is a function of the
XT1DRIVEx settings and the effective load. In general, comparable oscillator allowance can be achieved based on the following
guidelines, but should be evaluated based on the actual crystal selected for the application:
(a) For XT1DRIVEx = 0, CL,ef f ≤ 6 pF.
(b) For XT1DRIVEx = 1, 6 pF
≤ CL,ef f ≤ 9 pF.
(c) For XT1DRIVEx = 2, 6 pF
≤ CL,ef f ≤ 10 pF.
(d) For XT1DRIVEx = 3, CL,ef f ≥ 6 pF.
(5)
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.
(6)
Requires external capacitors at both terminals. Values are specified by crystal manufacturers.
(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.
46
Copyright 2010, Texas Instruments Incorporated
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