CC1310 datasheet(23/63 Pages) TI

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8.14.3.3 32.768 kHz Crystal Oscillator (XOSC_LF)

Measured on a Texas Instruments reference design with Tc = 25 °C, VDDS = 3.0 V, unless otherwise noted.

MIN

TYP

MAX

UNIT

Crystal frequency

32.768

kHz

ESR

Equivalent series resistance

100

kΩ

Crystal load capacitance

7(1)

(1)

Default load capacitance using TI reference designs including parasitic capacitance. Crystals with different load capacitance may be

used.

8.14.3.4 32 kHz RC Oscillator (RCOSC_LF)

Measured on a Texas Instruments reference design with Tc = 25 °C, VDDS = 3.0 V, unless otherwise noted.

MIN

TYP

MAX

UNIT

Calibrated frequency

32.8

kHz

Calibrated

RTC

variation(1)

Calibrated periodically against XOSC_HF(2)

±600(3)

ppm

Temperature coefficient.

ppm/°C

(1)

When using RCOSC_LF as source for the low frequency system clock (SCLK_LF), the accuracy of the SCLK_LF-derived Real Time

Clock (RTC) can be improved by measuring RCOSC_LF relative to XOSC_HF and compensating for the RTC tick speed. This

functionality is available through the TI-provided Power driver.

(2)

TI driver software calibrates the RTC every time XOSC_HF is enabled.

(3)

Some device's variation can exceed 1000 ppm. Further calibration will not improve variation.

8.14.4 Synchronous Serial Interface (SSI) Characteristics

8.14.4.1 Synchronous Serial Interface (SSI) Characteristics

over operating free-air temperature range (unless otherwise noted)

PARAMETER

NO.

PARAMETER

MIN

TYP

MAX

UNIT

tclk_per

SSIClk cycle time

65024

System Clocks (2)

S2(1)

tclk_high

SSIClk high time

0.5

tclk_per

S3(1)

tclk_low

SSIClk low time

0.5

tclk_per

(1)

Refer to SSI timing diagrams Figure 8-1, Figure 8-2, and Figure 8-3.

(2)

When using the TI-provided Power driver, the SSI system clock is always 48 MHz.

SSIClk

SSIFss

SSITx

SSIRx

MSB

LSB

4 to 16 bits

Figure 8-1. SSI Timing for TI Frame Format (FRF = 01), Single Transfer Timing Measurement

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