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MC34708 bảng dữ liệu(PDF) 24 Page - Freescale Semiconductor, Inc |
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MC34708 bảng dữ liệu(HTML) 24 Page - Freescale Semiconductor, Inc |
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24 / 159 page ![]() Analog Integrated Circuit Device Data Freescale Semiconductor 24 MC34708 Functional Block Description The power up sequence is shown in Tables 12 and 13. VCOREDIG, VSRTC, and VCORE, are brought up in the pre-sequencer startup. VUSB(30) Reserved 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 VUSB2 Reserved 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 VSRTC Reserved 1.2 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.2 1.2 1.2 VPLL Reserved 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 VREFDDR Reserved On On On On On On On On On On On VDAC Reserved 2.775 2.775 2.775 2.775 2.775 2.5 2.5 2.5 2.5 2.5 2.5 VGEN1 Reserved 1.2 1.3 1.3 1.3 1.3 1.2 1.2 1.2 1.2 1.2 1.2 VGEN2 Reserved 2.5 2.5 2.5 2.5 2.5 3.1 3.1 3.1 3.1 2.5 2.5 Notes 29. The SWx node are activated in APS mode when enabled by the startup sequencer. 30. VUSB regulator is only enabled if 5.0 V is present on VBUS. By default VUSB will be supplied by VBUS. SWBST = 5.0 V powers up as does VUSB, regardless of 5.0 V present on UVBUS. By default VUSB is supplied by SWBST. Table 12. Power Up Sequence i.MX53 Tap x 2.0 ms PUMS [4:1] = [0101,0110,0111,1000,1001] (i.MX53) 0 SW2 (VCC) 1 VPLL (NVCC_CKIH = 1.8 V) 2 VGEN2 (VDD_REG= 2.5 V, external PNP 3 SW3 (VDDA) 4 SW1A/B (VDDGP) 5 SW4A/B, VREFDDR (DDR/SYS) 6 7 SW5 (I/O), VGEN1 8 VUSB (31), VUSB2 9 VDAC Notes: 31. The VUSB regulator is only enabled if 5.0 V is present on the VBUS pin. By default VUSB will be supplied by the VBUS pin. Table 11. Power Up Defaults i.MX Reserved 53 LPM 53 DDR2 53 DDR3 53 LVDDR3 53 LVDDR2 50 50 50 50 50 50 |
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