MCIMX503CVM8B datasheet(31/136 Pages) NXP

31 / 136 page

Electrical Characteristics

i.MX50 Applications Processors for Consumer Products, Rev. 7

Freescale Semiconductor

2. OSCNT. This register is in the CCM block and may be set to a maximum of 256 x 32 kHz cycles,

or 8 msec. This counter is intended to give the 24MHz clock time to start up and stabilize.

If the PMIC_RDY input is used and BYPASS_PMIC_VFUNCTIONAL_READY = 0, the i.MX50 will

wait for STBY_COUNT cycles after PMIC_STBY_REQ negation before checking PMIC_RDY status.

Once the STBY_COUNT has expired AND the PMIC_RDY signal has been asserted, the OSCNT counter

begins and the 24MHz oscillator is powered up. After OSCNT expires the processor will enter RUN mode.

If the PMIC_RDY input is not used, the processor will attempt to start the 24 MHz oscillator after

STBY_COUNT expires. So at a minimum, all the supplies necessary to start up the 24 MHz oscillator need

to be powered before STBY_COUNT expires: NVCC_SRTC,VDD1P2, VDD1P8, VDD2P5, VDD3P0.

After STBY_COUNT expires, the OSCNT counter begins and the 24 MHz oscillator is powered up. After

OSCNT expires the processor will enter RUN mode, so all other supplies need to be at the appropriate

operating levels before OSCNT expires.

4.3

I/O DC Parameters

This section includes the DC parameters of the following I/O types:

•

General Purpose I/O and High-Speed General Purpose I/O (GPIO)

•

Double Data Rate 2 (DDR2)

•

Low Power Double Data Rate 2 (LPDDR2)

•

Low Power Double Data Rate 1(LPDDR1)

•

Low Voltage I/O (LVIO)

•

High Voltage I/O (HVIO)

•

Secure Digital Host Controllers (eSDHCv2 and eSDHCv3)

•

USB-OTG and USB Host ports

NOTE

The term OVDD in this section refers to the associated supply rail of an

input or output.

4.3.1

GPIO I/O DC Parameters

The parameters in Table 18 are guaranteed per the operating ranges in Table 11, unless otherwise noted.

Table 18. GPIO DC Electrical Characteristics

DC Electrical Characteristics

Symbol

Test Conditions

MIN

Typ

MAX

Units

High-level output voltage

Voh

Ioh=-1mA

Ioh=spec’ed Drive

OVDD-0.15

0.8*OVDD

——

Low-level output voltage

Vol

Iol=1mA

Iol=specified Drive

——

0.15

0.2*OVDD

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