TMS320F28027DAS datasheet(89/130 Pages) TI

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Zero-Pin Oscillator Frequency Movement With Temperature

9.6

9.7

9.8

9.9

10.1

10.2

10.3

10.4

10.5

10.6

–40

–30

–20

–10

100

110

120

Temperature (°C)

Typical

Max

TMS320F28027, TMS320F28026, TMS320F28023, TMS320F28022

TMS320F28021, TMS320F28020, TMS320F280200

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SPRS523F – NOVEMBER 2008 – REVISED DECEMBER 2010

Table 6-9. Internal Zero-Pin Oscillator (INTOSC1/INTOSC2) Characteristics

PARAMETER

MIN

TYP

MAX

UNIT

Internal zero-pin oscillator 1 (INTOSC1)(1)(2)

Frequency

MHz

Internal zero-pin oscillator 2 (INTOSC2)(1)(2)

Frequency

MHz

Step size (coarse trim)

kHz

Step size (fine trim)

kHz

Temperature drift(3)

3.03

4.85

kHz/°C

Voltage (VDD) drift

(3)

175

Hz/mV

(1)

In order to achieve better oscillator accuracy (10 MHz ± 1% or better) than shown, refer to the oscillator calibration example in

2802x C/C++ Header Files and Peripheral Examples (literature number SPRC832). Refer to Figure 6-5 for MIN/MAX values.

(2)

Frequency range ensured only when VREG is enabled, VREGENZ = VSS.

(3)

Output frequency of the internal oscillators follows the direction of both the temperature gradient and voltage (VDD) gradient. For

example:

•

Increase in temperature will cause the output frequency to increase per the temperature coefficient.

•

Decrease in voltage (VDD) will cause the output frequency to decrease per the voltage coefficient.

Figure 6-5. Zero-Pin Oscillator Frequency Movement With Temperature

Electrical Specifications

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