AM6548BACDXEAF datasheet(161/282 Pages) TI

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7.9.4.1.7 WKUP_LFOSC0 LVCMOS Digital Clock Source

Note

WKUP_LFOSC_XO/WKUP_LFOSC_XI - External main crystal interface pins connected to internal

oscillator which sources reference clock provides a clock for low power operation in deeper sleep

modes. For a list of supported low power modes for this device, please refer to Overview of Device

Low-Power Modes section in the device TRM.

Figure 7-27 shows the recommended oscillator connections when WKUP_LFOSC0 is connected to an

LVCMOS square-wave digital clock source. The 1.8-V LVCMOS-Compatible clock source is connected to the

WKUP_LFOSC0_XI pin. In this mode of operation, the WKUP_LFOSC0_XO pin is left unconnected and should

not be used to source any external components.

VSS

Device

WKUP_LFOSC0_XO

WKUP_LFOSC0_XI

PCB Ground

Figure 7-27. 1.8-V LVCMOS-Compatible Clock Input

Table 7-24 summarizes the WKUP_LFOSC0 input clock electrical characteristics.

Table 7-24. WKUP_LFOSC0 Oscillator Input Clock Electrical Characteristics—Bypass Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

CK0

1/tc(WKUP_LFOSC0_XI)

Frequency, WKUP_LFOSC0_XI

32.768

kHz

CK1

tw(WKUP_LFOSC0_XI)

Pulse duration, WKUP_LFOSC0_XI low or

high

0.45 ×

tc(WKUP_LF

OSC0_XI)

0.55 ×

tc(WKUP_LF

OSC0_XI)

CIN

Input capacitance

2.178

2.378

2.578

IIN

Input current (3.3V mode)

μA

tsX

Start-up time

see(1)

(1)

Before the processor boots up and the oscillator is set to bypass mode, there is a waiting time when the internal oscillator is in

application mode and receives a wave. The switching time in this case is about 100 μs.

WKUP_LFOSC0_XI

CK0

CK1

Figure 7-28. WKUP_LFOSC0_XI Input Clock

7.9.4.1.8 WKUP_LFOSC0 Not Used

For more Information see Section 6.5, Connections for Unused Pins.

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AM6548, AM6528, AM6526

SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021

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