MSP430F2619S-HT Datasheet, PDF (46/90 Pages) Texas Instruments – MIXED SIGNAL MICROCONTROLLER

MSP430F2619S-HT
SLAS697B – MARCH 2010 – REVISED JUNE 2011
www.ti.com
Crystal Oscillator (LFXT1) Low-Frequency Modes – Electrical Characteristics^{(1) (2)(2)}
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
f_LFXT1,LF
PARAMETER
LFXT1 oscillator crystal
frequency, LF mode 0, 1
TEST CONDITIONS
XTS = 0, LFXT1Sx = 0 or 1
V_CC
1.8 V to 3.6 V
MIN
TYP
32,768
MAX
LFXT1 oscillator
f_{LFXT1,LF,logic} logic-level square-wave XTS = 0, LFXT1Sx = 3
input frequency, LF mode
1.8 V to 3.6 V
10,000 32,768 50,000
XTS = 0, LFXT1Sx = 0;
f_LFXT1,LF = 32,768 kHz,
500
OA_LF
Oscillation allowance for ^CL,eff ^{= 6 pF}
LF crystals
XTS = 0, LFXT1Sx = 0;
f_LFXT1,LF = 32,768 kHz,
200
C_L,eff = 12 pF
XCAPx = 0
1
Integrated effective load
XCAPx = 1
5.5
C_L,eff
capacitance,
LF mode⁽³⁾
XTS = 0
XCAPx = 2
8.5
XCAPx = 3
11
Duty Cycle
f_Fault,LF
LF mode
Oscillator fault frequency
threshold, LF mode ⁽⁴⁾
XTS = 0, Measured at
P1.4/ACLK,
f_LFXT1,LF = 32,768 Hz
XTS = 0, LFXT1Sx = 3⁽⁵⁾
2.2 V/3 V
2.2 V/3 V
30
50
70
10
10,000
UNIT
Hz
Hz
kΩ
pF
%
Hz
(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) LFXT1 in 32-KHz mode is guaranteed to function only between –55°C to 105°C. This module is know to fail above 110°C. For further
info contact TI support.
(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.
Internal Very-Low-Power, Low-Frequency Oscillator (VLO) – Electrical Characteristics
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST
CONDITIONS
T_A
V_CC
MIN TYP MAX UNIT
f_VLO
VLO frequency
df_VLO/dT VLO frequency temperature drift
df_VLO/dV_CC VLO frequency supply voltage drift
See ⁽¹⁾
See ⁽²⁾
–55°C to 85°C
150°C
25°C
2.2 V/3 V
2.2 V/3 V
2.2 V/3 V
1.8 V –
3.6V
4 12 20
kHz
22
0.5 0.8 %/°C
4
%/V
(1) Calculated using the box method:
S Version: (MAX(–55 to 150°C) – MIN(–55 to 150°C))/MIN(–55 to 150°C)/(150°C – (–55°C))
(2) Calculated using the box method: (MAX(1.8 V to 3.6 V) – MIN(1.8V to 3.6 V))/MIN(1.8 V to 3.6 V)/(3.6 V – 1.8 V)
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