AM652X datasheet(156/277 Pages) TI1

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VSS

Device

WKUP_LFOSC0_XO

WKUP_LFOSC0_XI

PCB Ground

VDDA_WKUP

WKUP_LFOSC0_XO

Time

VSS

VDDA_WKUP (min.)

VDD_WKUP (min.)

VSS

VDD_WKUP

156

AM6548, AM6528, AM6546

AM6526, AM6527

SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019

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Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527

Specifications

Table 5-29. WKUP_LFOSC0 Switching Characteristics – Crystal Mode (continued)

NAME

DESCRIPTION

MIN

TYP

MAX

UNIT

tSX

Start-up time

(1)

(1) In order to meet the start-up time defined in this table, the crystal needs to be selected according to the following equation:

Tsu = K×Lm/ (Ro-ESR) + Δt

where Lm is crystal motional inductance, RO is the negative resistance of amplifier, ESR is the crystal Effective series resistance and K

is a constant which represents the initial conditions. Δt is the time amplifier takes to reach its bias point after power down is released.

Figure 5-22. WKUP_LFOSC0 Start-up Time

5.9.4.1.7 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 5-23 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.

Figure 5-23. 1.8-V LVCMOS-Compatible Clock Input

Table 5-30 summarizes the WKUP_LFOSC0 input clock electrical characteristics.

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