TMS570LS3137 datasheet(61/159 Pages) TI

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BIAS_EN

Low

Power

Oscillator

LFEN

LF_TRIM

HFEN

HF_TRIM

CLK80K

CLK10M

CLK10M_VALID

nPORRST

TMS570LS3137

www.ti.com

SPNS162.

– SEPTEMBER 2011

4.6.1.2

Low Power Oscillator

The Low Power Oscillator (LPO) is comprised of two oscillators

— HF LPO and LF LPO, in a single

macro.

4.6.1.2.1 Features

The main features of the LPO are:

•

Supplies a clock at extremely low power for power-saving modes. This is connected as clock source #

4 of the Global Clock Module.

•

Supplies a high-frequency clock for non-timing-critical systems. This is connected as clock source # 5

of the Global Clock Module.

•

Provides a comparison clock for the crystal oscillator failure detection circuit.

Figure 4-5. LPO Block Diagram

Figure 4-5 shows a block diagram of the internal reference oscillator. This is a low power oscillator (LPO)

and provides two clock sources: one nominally 80KHz and one nominally 10MHz.

4.6.1.2.2 LPO Electrical and Timing Specifications

Table 4-10. LPO Specifications

Parameter

MIN

Type

MAX

Unit

LPO - HF oscillator

untrimmed frequency

5.5

9.6

19.5

MHz

startup time from STANDBY (LPO BIAS_EN High for

µs

at least 900

µs)

cold startup time

900

µs

LPO - LF oscillator

untrimmed frequency

180

kHz

startup time from STANDBY (LPO BIAS_EN High for

100

µs

at least 900

µs)

cold startup time

2000

µs

System Information and Electrical Specifications

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