AM6546 datasheet(159/284 Pages) TI

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Table 7-21. OSC1 Input Clock Timing Requirements (continued)

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

CK1

tw(OSC1_XI)

Pulse duration, OSC1_XI low or high

0.45 ×

tc(OSC1_XI)

0.55 ×

tc(OSC1_XI)

tj(OSC1_XI)

Period jitter, OSC1_XI

0.01 ×

tc(OSC1_XI)

tR(OSC1_XI)

Rise time, OSC1_XI

tF(OSC1_XI)

Fall time, OSC1_XI

tj(OSC1_XI)

Frequency accuracy, OSC1_XI

Ethernet RGMII and RMII

not used

±100

ppm

Ethernet RGMII and RMII

using derived clock

±50

OSC1_XI

CK0

CK1

Figure 7-23. OSC1_XI Input Clock

7.9.4.1.5 Auxiliary OSC1 Not Used

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

7.9.4.1.6 WKUP_LFOSC0 Internal Oscillator 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 7-24 shows the recommended crystal circuit. It is recommended that preproduction printed-circuit board

(PCB) designs include the two optional resistors Rbias and Rd in case they are required for proper oscillator

operation when combined with production crystal circuit components. In most cases, Rbias is not required and

Rd is a 0 ohm resistor. These resistors may be removed from production PCB designs after evaluating oscillator

performance with production crystal circuit components installed on preproduction PCBs.

Device

WKUP_LFOSC0_XO

WKUP_LFOSC0_XI

Crystal

(Optional)

SPRSP08_PCB_CLK_OSC_3

Rbias

(Optional)

PCB Ground

Figure 7-24. WKUP_LFOSC0 Crystal Implementation

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AM6548, AM6528, AM6546, AM6526

SPRSP52B – DECEMBER 2019 – REVISED JUNE 2021

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