AM652X datasheet(157/277 Pages) TI1

157 / 277 page

WKUP_LFOSC0_XI

CK0

CK1

157

AM6548, AM6528, AM6546

AM6526, AM6527

www.ti.com

SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Specifications

Table 5-30. 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_L

FOSC0_XI)

0.55 ×

tc(WKUP_L

FOSC0_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.

Figure 5-24. WKUP_LFOSC0_XI Input Clock

5.9.4.1.8 WKUP_LFOSC0 Not Used

For more Information see Section 4.5, Connections for Unused Pins.

5.9.4.2

Output Clocks

The device provides several system clock outputs. Summary of these output clocks are as follows:

•

MCU_SYSCLKOUT0

–

SYSCLK0 of WKUP_PLLCTRL0 is divided by 4 and then sent out of the device as a LVCMOS

clock signal (MCU_SYSCLKOUT0). This signal can be used to test if the main chip clock is

functioning or not.

•

MCU_OBSCLK0

–

On the clock output MCU_OBSCLK0, oscillators and PLLs clocks can be observed for tests and

debug.

•

SYSCLKOUT0

–

SYSCLK0 from the MAIN_PLL controller is divided by 4 and then sent out of the device as a

LVCMOS clock signal (SYSCLKOUT0). This signal can be used to test if the main chip clock is

functioning or not.

•

OBSCLK0

–

On the clock output OBSCLK0, oscillators and PLLs clocks can be observed for tests and debug.

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