AM4376 datasheet(130/261 Pages) TI

130 / 261 page

AM4376, AM4377, AM4378, AM4379

SPRS851B – JUNE 2014 – REVISED APRIL 2015

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5.12.2.2 Input Clock Specifications

The device has two clock inputs. Each clock input passes through an internal oscillator which can be connected

to an external crystal circuit (oscillator mode) or external LVCMOS square-wave digital clock source (bypass

mode). The oscillators automatically operate in bypass mode when their input is connected to an external

LVCMOS square-wave digital clock source. The oscillator associated with a specific clock input must be enabled

when the clock input is being used in either oscillator mode or bypass mode.

The OSC1 oscillator provides a 32.768-kHz reference clock to the real-time clock (RTC) and is connected to the

RTC_XTALIN and RTC_XTALOUT terminals. This clock source is referred to as the 32K oscillator

(CLK_32K_RTC) in the device-specific technical reference manual. OSC1 is disabled by default after power is

applied. This clock input is optional and may not be required if the RTC is configured to receive a clock from the

internal 32k RC oscillator (CLK_RC32K) or peripheral PLL (CLK_32KHZ) which receives a reference clock from

the OSC0 input.

The OSC0 oscillator provides a 19.2-MHz, 24-MHz, 25-MHz, or 26-MHz reference clock which is used to clock

all non-RTC functions and is connected to the XTALIN and XTALOUT terminals. This clock source is referred to

as the master oscillator (CLK_M_OSC) in the device-specific technical reference manual. OSC0 is enabled by

default after power is applied.

For more information related to recommended circuit topologies and crystal oscillator circuit requirements for

these clock inputs, see Section 5.12.2.3.

130

Specifications

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AM4376 Datasheet(PDF) 130 Page - Texas Instruments