MSP432P411VIPZ datasheet(51/212 Pages) TI1

51 / 212 page

MSP432P4111, MSP432P4011, MSP432P411Y

MSP432P401Y, MSP432P411V, MSP432P401V

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SLASEA0A – DECEMBER 2017 – REVISED FEBRUARY 2018

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Specifications

5.26.4 Clock Specifications

Table 5-8 lists the input requirement for the low-frequency crystal oscillator, LFXT.

(1)

Does not include board parasitics. Package and board add additional capacitance to CLFXT.

Table 5-8. Low-Frequency Crystal Oscillator, LFXT, Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ESR

Crystal equivalent series resistance

fOSC = 32.768 kHz

Ω

CLFXT

Capacitance from LFXT input to ground and from

LFXT output to ground(1)

7.4

CSHUNT

Crystal shunt capacitance

0.6

0.8

1.6

Crystal motional capacitance

Table 5-9 lists the characteristics of the low-frequency crystal oscillator, LFXT.

(1)

Total current measured on both AVCC and DVCC supplies.

(2)

Measured at ACLK pin.

(3)

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 data sheet. Duty cycle requirements are defined by DCLFXT, SW.

(4)

Maximum frequency of operation of the entire device cannot be exceeded.

(5)

Oscillation allowance is based on a safety factor of 5 for recommended crystals. The oscillation allowance is a function of the

LFXTDRIVE 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:

•

For LFXTDRIVE = {0}, CL,eff = 3.7 pF

•

For LFXTDRIVE = {1}, 6 pF

≤ CL,eff ≤ 9 pF

•

For LFXTDRIVE = {2}, 6 pF

≤ CL,eff ≤ 10 pF

•

For LFXTDRIVE = {3}, 6 pF

≤ CL,eff ≤ 12 pF

Table 5-9. Low-Frequency Crystal Oscillator, LFXT

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)

PARAMETER

TEST CONDITIONS

VCC

MIN

TYP

MAX

UNIT

IVCC,LFXT

Current consumption(1)

fOSC = 32.768 kHz,

LFXTBYPASS = 0, LFXTDRIVE = {0},

CL,eff = 3.7 pF, Typical ESR, CSHUNT

3.0 V

100

fOSC = 32.768 kHz,

LFXTBYPASS = 0, LFXTDRIVE = {1},

CL,eff = 6 pF, Typical ESR, CSHUNT

120

fOSC = 32.768 kHz,

LFXTBYPASS = 0, LFXTDRIVE = {2},

CL,eff = 9 pF, Typical ESR, CSHUNT

150

fOSC = 32.768 kHz,

LFXTBYPASS = 0, LFXTDRIVE = {3},

CL,eff = 12 pF, Typical ESR, CSHUNT

170

fLFXT

LFXT oscillator crystal

frequency

LFXTBYPASS = 0(2)

32.768

kHz

DCLFXT

LFXT oscillator duty cycle

fLFXT = 32.768 kHz

(2)

30%

70%

fLFXT,SW

LFXT oscillator logic-level

square-wave input frequency

LFXTBYPASS = 1(3) (4)

32.768

kHz

DCLFXT,

LFXT oscillator logic-level

square-wave input duty cycle

LFXTBYPASS = 1

30%

70%

OALFXT

Oscillation allowance for

LF crystals(5)

LFXTBYPASS = 0, LFXTDRIVE = {1},

fLFXT = 32.768 kHz, CL,eff = 6 pF

200

240

Ω

LFXTBYPASS = 0, LFXTDRIVE = {3},

fLFXT = 32.768 kHz, CL,eff = 12 pF

300

340

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