TMS570LS1114 datasheet(60/169 Pages) TI1

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BIAS_EN

Low

Power

Oscillator

LFEN

LF_TRIM

HFEN

HF_TRIM

LFLPO

HFLPO

HFLPO_VALID

nPORRST

TMS570LS1114

SPNS188B – OCTOBER 2012 – REVISED FEBRUARY 2015

www.ti.com

6.6.1.2

Low Power Oscillator

The Low Power Oscillator (LPO) is comprised of two oscillators — HF LPO and LF LPO, in a single

macro.

6.6.1.2.1 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 6-5. LPO Block Diagram

Figure 6-5 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.

Table 6-10. LPO Specifications

Parameter

MIN

Typical

MAX

Unit

Clock Detection

oscillator fail frequency - lower threshold, using

1.375

2.4

4.875

MHz

untrimmed LPO output

oscillator fail frequency - higher threshold, using

38.4

MHz

untrimmed LPO output

LPO - HF oscillator

untrimmed frequency

5.5

19.5

MHz

(fHFLPO)

trimmed frequency

9.6

MHz

startup time from STANDBY (LPO BIAS_EN High for

µs

at least 900µs)

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 900µs)

cold startup time

2000

µs

System Information and Electrical Specifications

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