參數(shù)資料
型號(hào)： MSP430F2274MRHAEP
廠商： TEXAS INSTRUMENTS INC
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, RISC MICROCONTROLLER, PQCC40
封裝： GREEN, PLASTIC, MO-220VJJD-2, VQFN-40
文件頁(yè)數(shù)： 27/79頁(yè)
文件大?。?/td> 1274K
代理商： MSP430F2274MRHAEP
www.ti.com
SLAS614C – SEPTEMBER 2008 – REVISED JULY 2010
Crystal Oscillator (LFXT1) Low-Frequency Modes – Electrical Characteristics
(1) (2)
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
TA
VCC
MIN
TYP
MAX
UNIT
LFXT1 oscillator crystal
–55°C to
fLFXT1,LF
XTS = 0, LFXT1Sx = 0 or 1
1.8 V to 3.6 V
32,768
Hz
frequency, LF mode 0, 1
105°C
LFXT1 oscillator
fLFXT1,LF logic-level square-wave
–55°C to
XTS = 0, LFXT1Sx = 3
1.8 V to 3.6 V
10,000
32,768
50,000
Hz
,logic
input frequency, LF
125°C
mode
XTS = 0, LFXT1Sx = 0;
–55°C to
fLFXT1,LF = 32,768 kHz,
500
105°C
CL,eff = 6 pF
Oscillation allowance for
OALF
k
LF crystals
XTS = 0, LFXT1Sx = 0;
–55°C to
fLFXT1,LF = 32,768 kHz,
200
105°C
CL,eff = 12 pF
XCAPx = 0
1
Integrated effective load
XCAPx = 1
5.5
–55°C to
CL,eff
capacitance,
XTS = 0
pF
105°C
XCAPx = 2
8.5
LF mode(3)
XCAPx = 3
11
XTS = 0, Measured at
Duty
–55°C to
LF mode
P1.4/ACLK,
2.2 V/3 V
30
50
70
%
Cycle
125°C
fLFXT1,LF = 32,768 Hz
Oscillator fault frequency
–55°C to
fFault,LF
XTS = 0, LFXT1Sx = 3(5)
2.2 V/3 V
10
10,000
Hz
threshold, LF mode (4)
125°C
(1)
To improve EMI on the LFXT1 oscillator the following guidelines should be observed:
(a) Keep as short of a trace as possible between the device and the crystal.
(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.
(g) Do not route the XOUT line to the JTAG header to support the serial programming adapter as shown in other documentation. This
signal is no longer required for the serial programming adapter.
(2)
Use of the LFXT1 Crystal Oscillator with TA > 105°C is not guaranteed. It is recommended that an external digital clock source or the
internal DCO is used to provide clocking.
(3)
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.
(4)
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.
(5)
Measured with logic-level input frequency, but also applies to operation with crystals with TA < 105°C.
Internal Very-Low-Power, Low-Frequency Oscillator (VLO) – Electrical Characteristics
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
TEST
PARAMETER
TA
VCC
MIN
TYP
MAX
UNIT
CONDITIONS
–55°C to 85°C
2.2 V/3 V
4
12
20
fVLO
VLO frequency
kHz
125°C
2.2 V/3 V
22
dfVLO/dT
VLO frequency temperature drift
(1)
–55°C to 125°C
2.2 V/3 V
0.5
%/°C
1.8 V –
dfVLO/dVCC VLO frequency supply voltage drift
(2)
25°C
4
%/V
3.6V
(1)
Calculated using the box method:
I Version: [MAX(–55...85°C) – MIN(–55...85°C)]/MIN(55–...85°C)/[85°C – (–55°C)]
T Version: [MAX(–55...125°C) – MIN(–55...125°C)]/MIN(–55...125°C)/[125°C – (–55°C)]
(2)
Calculated using the box method: [MAX(1.8...3.6 V) – MIN(1.8...3.6 V)]/MIN(1.8...3.6 V)/(3.6 V – 1.8 V)
Copyright 2008–2010, Texas Instruments Incorporated
33
Product Folder Link(s): MSP430F2274-EP
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MSP430F2274MRHATEP 功能描述:16位微控制器 - MCU MicroLogic-MCU 16B MCU RoHS:否 制造商:Texas Instruments 核心:RISC 處理器系列:MSP430FR572x 數(shù)據(jù)總線寬度:16 bit 最大時(shí)鐘頻率:24 MHz 程序存儲(chǔ)器大小:8 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:VQFN-40 安裝風(fēng)格:SMD/SMT
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