TMS570LS3137 datasheet(59/159 Pages) TI

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OSCIN

OSCOUT

(see Note A)

Crystal

(a)

OSCIN

OSCOUT

(b)

External

(toggling 0-3.3V)

Clock Signal

Note A: The values of C1 and C2 should be provided by the resonator/crystal vendor.

Kelvin_GND

Note B: Kelvin_GND should not be connected to any other GND.

(see Note B)

TMS570LS3137

www.ti.com

SPNS162.

– SEPTEMBER 2011

4.6

Clocks

4.6.1

Clock Sources

The table below lists the available clock sources on the device. Each of the clock sources can be enabled

or disabled using the CSDISx registers in the system module. The clock source number in the table

corresponds to the control bit in the CSDISx register for that clock source.

The table also shows the default state of each clock source.

Table 4-8. Available Clock Sources

Clock

Name

Description

Default State

Source #

OSCIN

Main Oscillator

Enabled

PLL1

Output From PLL1

Disabled

Reserved

Disabled

EXTCLKIN1

External Clock Input #1

Disabled

CLK80K

Low Frequency Output of Internal Reference Oscillator

Enabled

High Frequency Output of Internal Reference

CLK10M

Enabled

Oscillator

PLL2

Output From PLL2

Disabled

EXTCLKIN2

External Clock Input #2

Disabled

4.6.1.1

Main Oscillator

The oscillator is enabled by connecting the appropriate fundamental resonator/crystal and load capacitors

across the external OSCIN and OSCOUT pins as shown in Figure 4-4. The oscillator is a single stage

inverter held in bias by an integrated bias resistor. This resistor is disabled during leakage test

measurement and low power modes.

TI strongly encourages each customer to submit samples of the device to the resonator/crystal

vendors for validation. The vendors are equipped to determine what load capacitors will best tune

their resonator/crystal to the microcontroller device for optimum start-up and operation over

temperature/voltage extremes.

An external oscillator source can be used by connecting a 3.3V clock signal to the OSCIN pin and leaving

the OSCOUT pin unconnected (open) as shown in the figure below.

Figure 4-4. Recommended Crystal/Clock Connection

System Information and Electrical Specifications

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