AM3703CUS datasheet(130/280 Pages) TI

130 / 280 page

vdds, vdds_mem,

vdds_sram,

vdda_wkup_bg_bb

vdda_dplls_dll,

vdda_dpll_per

vdd_core

vdd_mpu_iva

sys_32k

sys_xtalin

sys_nrespwron

sys_nreswarm

vdds_mmc1,

vdds_x, vdda_dac

1.8 V

1.1 V

(1)

1.1 V

(1)

1.8 V

AM3715, AM3703

SPRS616F

– JUNE 2010 – REVISED AUGUST 2011

www.ti.com

(1)

1.2 V supported.

(2)

If an external square clock is provided, it could be started after sys_nrespwron release, provided it is clean, i.e. no glitch, stable

frequency and duty cycle.

(3)

sys_32k can be turned on any time between the vdds ramp-up and the sys_nrespwron release.

Figure 3-2. Power-Up Sequence

3.5.2

Power-Down Sequence

The following steps give two examples of power-down sequence supported by the AM37x device.

1. Put the AM37x device under reset (sys_nrespwron)

2. Stop all signals driven to its balls (sys_32k, sys_xtalin)

3. Either:

(a) Shutdown all power domains at once. This sequence is described in black color in Figure 3-3.

(b) Or, if the shutdown is sequenced, you must follow these steps (described in dash style blue color

in Figure 3-3):

– Turn off all complex IO domains (vdds_mmc1, vdds_x)

– Turn off all the core and MPU domains (vdd_core, vdd_mpu_iva)

– Turn off all DPLL domains (vdda_dplls_dll, vdda_dpll_per)

– Turn off all sram LDOs (vdds_sram)

– Turn off all reference domains (vdda_wkup_bg_bb)

– Turn off all standard IO domains (vdds, vdds_mem)

Figure 3-3 shows both power-down sequences: one of them is described in black color, and the other one

in dash style blue.

130

Electrical Characteristics

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