參數(shù)資料
型號： MSP430BT5190IZQW
廠商： TEXAS INSTRUMENTS INC
元件分類： 微控制器/微處理器
英文描述： RISC MICROCONTROLLER, PBGA113
封裝： LEAD FREE, PLASTIC, BGA-113
文件頁數(shù)： 42/97頁
文件大?。?/td> 724K
代理商： MSP430BT5190IZQW
PRODUCTPREVIEW
MSP430BT5190
www.ti.com
SLAS703 – APRIL 2010
Crystal Oscillator, XT1, High-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 = 4 MHz,
XTS = 1, XOSCOFF = 0,
200
XT1BYPASS = 0, XT1DRIVEx = 0,
TA = 25°C
fOSC = 12 MHz,
XTS = 1, XOSCOFF = 0,
260
XT1BYPASS = 0, XT1DRIVEx = 1,
TA = 25°C
XT1 oscillator crystal current,
IDVCC.HF
3.0 V
A
HF mode
fOSC = 20 MHz,
XTS = 1, XOSCOFF = 0,
325
XT1BYPASS = 0, XT1DRIVEx = 2,
TA = 25°C
fOSC = 32 MHz,
XTS = 1, XOSCOFF = 0,
450
XT1BYPASS = 0, XT1DRIVEx = 3,
TA = 25°C
XT1 oscillator crystal frequency,
XTS = 1,
fXT1,HF0
4
8
MHz
HF mode 0
XT1BYPASS = 0, XT1DRIVEx = 0(2)
XT1 oscillator crystal frequency,
XTS = 1,
fXT1,HF1
8
16
MHz
HF mode 1
XT1BYPASS = 0, XT1DRIVEx = 1(2)
XT1 oscillator crystal frequency,
XTS = 1,
fXT1,HF2
16
24
MHz
HF mode 2
XT1BYPASS = 0, XT1DRIVEx = 2(2)
XT1 oscillator crystal frequency,
XTS = 1,
fXT1,HF3
24
32
MHz
HF mode 3
XT1BYPASS = 0, XT1DRIVEx = 3(2)
XT1 oscillator logic-level
XTS = 1,
fXT1,HF,SW
square-wave input frequency,
1.5
32
MHz
XT1BYPASS = 1(3) (2)
HF mode, bypass mode
XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 0,
450
fXT1,HF = 6 MHz, CL,eff = 15 pF
XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 1,
320
fXT1,HF = 12 MHz, CL,eff = 15 pF
Oscillation allowance for
OAHF
HF crystals(4)
XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 2,
200
fXT1,HF = 20 MHz, CL,eff = 15 pF
XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 3,
200
fXT1,HF = 32 MHz, CL,eff = 15 pF
fOSC = 6 MHz, XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 0,
0.5
TA = 25°C,
CL,eff = 15 pF
tSTART,HF
Startup time, HF mode
3.0 V
ms
fOSC = 20 MHz, XTS = 1,
XT1BYPASS = 0, XT1DRIVEx = 2,
0.3
TA = 25°C,
CL,eff = 15 pF
(1)
To improve EMI on the XT1 oscillator the following guidelines should be observed.
(a) Keep the traces 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)
This represents the maximum frequency that can be input to the device externally. Maximum frequency achievable on the device
operation is based on the frequencies present on ACLK, MCLK, and SMCLK cannot be exceed for a given range of operation.
(3)
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.
(4)
Oscillation allowance is based on a safety factor of 5 for recommended crystals.
Copyright 2010, Texas Instruments Incorporated
47
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