DRA752ABC datasheet(196/443 Pages) TI2

196 / 443 page

Device

rtc_osc_xo

rtc_osc_xi_clkin32

SPRS85v_CLK_11

CL=

C C

(C +C )

196

DRA756, DRA755, DRA754, DRA752

DRA751, DRA750, DRA746, DRA745, DRA744

SPRS950F – DECEMBER 2015 – REVISED MAY 2019

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Clock Specifications

Figure 6-11. Load Capacitance Equation

The crystal must be in the fundamental mode of operation and parallel resonant. Table 6-9 summarizes

the required electrical constraints.

Table 6-9. RTC Crystal Electrical Characteristics

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Parallel resonance crystal frequency

32.768

kHz

Cf1

Cf1 load capacitance for crystal parallel resonance with Cf1 = Cf2

Cf2

Cf2 load capacitance for crystal parallel resonance with Cf1 = Cf2

ESR(Cf1,Cf2)

Crystal ESR

kΩ

Crystal shunt capacitance

Crystal motional inductance for fp = 32,768 kHz

10.7

Crystal motional capacitance

2.2

tj(rtc_osc_xi_clkin32)

Frequency accuracy, rtc_osc_xi_clkin32

±200

ppm

When selecting a crystal, the system design must take into account the temperature and aging

characteristics of a crystal versus the user environment and expected lifetime of the system.

Table 6-10 details the switching characteristics of the oscillator and the requirements of the input clock.

Table 6-10. Oscillator Switching Characteristics—Crystal Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

Oscillation frequency

32.768

kHz

tsX

Start-up time

6.1.4.2

RTC Oscillator Input Clock

A 1.8-V LVCMOS-Compatible Clock Input can be used instead of the internal oscillator to provide the

FUNC_32K_CLK clock input to the system. The external connections to support this are shown in

Figure 6-12. The rtc_osc_xi_clkin32 pin is connected to the 1.8-V LVCMOS-Compatible clock sources.

The rtc_osc_xo pin is left unconnected.

Figure 6-12. LVCMOS-Compatible Clock Input

Table 6-11 summarizes the RTC Oscillator input clock electrical characteristics.

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