MSP430FR59691 Datasheet, PDF (25/131 Pages) Texas Instruments – MSP430FR59xx Mixed-Signal Microcontrollers

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SLAS704C – OCTOBER 2012 – REVISED JUNE 2014
5.12.2 Reset Timing
Table 5-3. Reset Input
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
t_(RST)
PARAMETER
External reset pulse duration on RST⁽¹⁾
TEST CONDITIONS
V_CC
2.2 V,
3.0 V
MIN TYP
2
(1) Not applicable if RST/NMI pin configured as NMI.
MAX UNIT
µs
5.12.3 Clock Specifications
Table 5-4. Low-Frequency Crystal Oscillator, LFXT⁽¹⁾
over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
I_VCC.LFXT
PARAMETER
Current consumption
TEST CONDITIONS
V_CC
MIN
TYP
f_OSC = 32768 Hz
LFXTBYPASS = 0, LFXTDRIVE = {0},
T_A = 25°C,
C_L,eff = 3.7 pF
ESR ~ 44 kΩ
3.0 V
180
f_OSC = 32768 Hz
LFXTBYPASS = 0, LFXTDRIVE = {1},
T_A = 25°C,
C_L,eff = 6 pF
ESR ~ 40 kΩ
3.0 V
185
f_OSC = 32768 Hz
LFXTBYPASS = 0, LFXTDRIVE = {2},
T_A = 25°C,
C_L,eff = 9 pF,
ESR ~ 40 kΩ
3.0 V
225
f_OSC = 32768 Hz
LFXTBYPASS = 0, LFXTDRIVE = {3},
T_A = 25°C,
C_L,eff = 12.5 pF,
ESR ~ 40 kΩ
3.0 V
330
f_LFXT
LFXT oscillator crystal
frequency
LFXTBYPASS = 0
32768
DC_LFXT
f_LFXT,SW
LFXT oscillator duty cycle
LFXT oscillator logic-level
square-wave input frequency
Measured at ACLK,
f_LFXT = 32768 Hz
LFXTBYPASS = 1^{(2) (3)}
30
10.5 32.768
DC_{LFXT, SW}
LFXT oscillator logic-level
square-wave input duty cycle
LFXTBYPASS = 1
30
MAX UNIT
nA
nA
nA
nA
Hz
70 %
50 kHz
70 %
(1) To improve EMI on the LFXT oscillator, the following guidelines should be observed.
• Keep the trace between the device and the crystal as short as possible.
• Design a good ground plane around the oscillator pins.
• Prevent crosstalk from other clock or data lines into oscillator pins LFXIN and LFXOUT.
• Avoid running PCB traces underneath or adjacent to the LFXIN and LFXOUT pins.
• Use assembly materials and praxis to avoid any parasitic load on the oscillator LFXIN and LFXOUT pins.
• If conformal coating is used, ensure that it does not induce capacitive/resistive leakage between the oscillator pins.
(2) When LFXTBYPASS is set, LFXT circuits are automatically powered down. Input signal is a digital square wave with parametrics
defined in the Schmitt-trigger Inputs section of this datasheet. Duty cycle requirements are defined by DC_{LFXT, SW}.
(3) Maximum frequency of operation of the entire device cannot be exceeded.
Copyright © 2012–2014, Texas Instruments Incorporated
Specifications
25
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