IMX35 datasheet(17/148 Pages) FREESCALE

17 / 148 page

i.MX35 Applications Processors for Industrial and Consumer Products, Rev. 6

Freescale Semiconductor

4.4.1

Power On Reset

POR_B is normally connected to a power management integrated circuit (PMIC). The PMIC asserts

POR_B while the power supplies are turned on and negates POR_B after the power up sequence is

finished. See Figure 2.

Assuming the i.MX35 chip is already fully powered; it is still possible to reset all of the modules to their

default reset by asserting POR_B for at least 4 CKIL cycles and later de-asserting POR_B. This method

of resetting the i.MX35 can also be supported by tying the POR_B and RESET_IN_B pins together.

Figure 3. Timing Between POR_B and CKIL for Complete Reset of i.MX35

4.4.2

System Reset

System reset can be achieved by asserting RESET_IN_B for at least 4 CKIL cycles and later negating

RESET_IN_B. The following modules are not reset upon system reset: RTC, PLLs, CCM, and IIM.

POR_B pin must be deasserted all the time.

Figure 4. Timing Between RESET_IN_B and CKIL for i.MX35 System Reboot

4.5

Power Characteristics

The table shows values representing maximum current numbers for the i.MX35 under worst case voltage

and temperature conditions. These values are derived from the i.MX35 with core clock speeds up to

532 MHz. Common supplies have been bundled according to the i.MX35 power-up sequence

requirements. Peak numbers are provided for system designers so that the i.MX35 power supply

POR_B

CKIL

At least 4 CKIL cycles

RESET_IN_B

CKIL

At least 4 CKIL cycles

IMX35 Datasheet(PDF) 17 Page - Freescale Semiconductor, Inc