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AM652X Scheda tecnica(PDF) 150 Page - Texas Instruments |
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AM652X Scheda tecnica(HTML) 150 Page - Texas Instruments |
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150 / 277 page ![]() VSS Device WKUP_OSC0_XO WKUP_OSC0_XI NC SPRSP08_CLK_02 NC PCB Ground VDDA_WKUP WKUP_OSC0_XO t sX Time VSS VDDA_WKUP (min.) VDD_WKUP (min.) VSS VDD_WKUP 150 AM6548, AM6528, AM6546 AM6526, AM6527 SPRSP08I – NOVEMBER 2017 – REVISED DECEMBER 2019 www.ti.com Submit Documentation Feedback Product Folder Links: AM6548 AM6528 AM6546 AM6526 AM6527 Specifications Copyright © 2017–2019, Texas Instruments Incorporated (1) In order to meet the start-up time defined in this table, the crystal needs to be selected according to the following equation: Tsu = K×Lm/ (Ro-ESR) + Δt where Lm is crystal motional inductance, RO is the negative resistance of amplifier, ESR is the crystal Effective series resistance and K is a constant which represents the initial conditions. Δt is the time amplifier takes to reach its bias point after power down is released. Figure 5-12. WKUP_OSC0 Start-up Time 5.9.4.1.2 WKUP_OSC0 LVCMOS Digital Clock Source Figure 5-13 shows the recommended oscillator connections when WKUP_OSC0 is connected to an LVCMOS square-wave digital clock source The 1.8-V LVCMOS-Compatible clock source is connected to the WKUP_OSC0_XI pin. In this mode of operation, the WKUP_OSC0_XO pin is left unconnected and should not be used to source any external components. Figure 5-13. 1.8-V LVCMOS-Compatible Clock Input Table 5-22 summarizes the WKUP_OSC0 input clock electrical characteristics Table 5-22. WKUP_OSC0 Switching Characteristics – Crystal Mode NAME DESCRIPTION MIN TYP MAX UNIT f Frequency 19.2, 20, 24, 25, 26, 27 MHz CIN Input capacitance 2.184 2.384 2.584 pF IIN Input current (3.3V mode) 4 6 10 µA |
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