SN260 查看數據表（PDF） - STMicroelectronics

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SN260

ZigBee® 802.15.4 network processor

STMicroelectronics 

Functional description

SN260

5.10.2

Table 12 lists the specifications for the high-frequency crystal.

Table 12. High-frequency crystal specifications

Parameter

Test conditions

Frequency

Duty cycle

Phase noise from 1kHz to

100kHz

Accuracy

Initial, temperature, and aging

Crystal ESR

Load capacitance of 10pF

Crystal ESR

Load capacitance of 18pF

Start-up time to stable

clock (max. bias)

Start-up time to stable

clock (optimum bias)

Current consumption

Current consumption

Current consumption

Good crystal: 20Ω ESR, 10pF load

Worst-case crystals (60Ω, 18pF or

100Ω, 10pF)

At maximum bias

Min.

40

- 40

Typ.

24

0.2

Max.

60

- 120

+ 40

100

60

1

2

0.3

0.5

1

Unit

MHz

%

dBc/Hz

ppm

W

W

ms

ms

mA

mA

mA

Internal RC oscillator

The SN260 has a low-power, low-frequency RC oscillator that runs all the time. Its nominal

frequency is 10kHz. It is divided down to 1kHz using a variable divider to allow software to

accurately calibrate it. This calibrated clock is used by the sleep timer.

Time-keeping accuracy depends on temperature fluctuations the chip is exposed to, power

supply impedance, and the calibration interval, but in general it will be better than 150ppm

(including crystal error of 40ppm).

Table 13 lists the specifications of the RC oscillator.

Table 13. RC oscillator specifications

Parameter

Test conditions

Min. Typ. Max. Unit

Frequency

10

kHz

Analog trim steps

1

kHz

Frequency variation with supply

For a voltage drop from 3.6V

to 3.1V or 2.6V to 2.1V

0.75 1.5

%

20/88

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