BLUENRG-LP datasheet(47/72 Pages) STMICROELECTRONICS

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5.3.10

Low speed crystal requirements

Low speed clock can be supplied with an external 32.768 kHz crystal oscillator. Requirements for the external

32.768 kHz crystal are reported in the table below.

Table 27. LSE crystal requirements

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

fNOM

Nominal frequency

32.768

kHz

ESR

Equivalent series resistance

kΩ

Drive level

0.1

µW

5.3.11

High speed ring oscillator characteristics

Table 28. HSI oscillator characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

fNOM

Nominal frequency

MHz

5.3.12

Low speed ring oscillator characteristics

Table 29. LSI oscillator characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

fNOM

Nominal frequency

kHz

ΔFRO_ΔT/FRO

Frequency spread vs. temperature

Standard deviation

140

ppm/ºC

5.3.13

PLL characteristics

Characteristics measured over recommended operating conditions unless otherwise specified.

Table 30. PLL characteristics

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

PNSYNTH

RF carrier phase noise

At ±1 MHz offset from carrier

(measured at 2.4 GHz)

-110

dBc/Hz

At 2.4 GHz ±3 MHz offset from carrier

(measured at 2.4 GHz)

-114

dBc/Hz

At 2.4 GHz±6 MHz offset from carrier

(measured at 2.4 GHz)

-128

dBc/Hz

At ±25 MHz offset from carrier

-135

dBc/Hz

LOCKTIMETX

PLL lock time to TX

With calibration @2.5 ppm

150

µs

LOCKTIMERX

PLL lock time to RX

With calibration @2.5 ppm

110

µs

LOCKTIMERXTX

PLL lock time RX to TX

Without calibration @2.5 ppm

µs

LOCKTIMETXRX

PLL lock time TX to RX

Without calibration @2.5 ppm

µs

BlueNRG-LP

Operating conditions

DS13282 - Rev 2

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