PRT2011CVL5A datasheet(31/112 Pages) NXP

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Electrical Characteristics

i.MX RT1064 Crossover Processors Data Sheet for Consumer Products, Rev. 2, 08/2020

NXP Semiconductors

power from VDD_HIGH_IN when that supply is available and transitions to the backup battery when

VDD_HIGH_IN is lost.

In addition, if the clock monitor determines that the OSC32K is not present, then the source of the 32 K

will automatically switch to a crude internal ring oscillator. The frequency range of this block is

approximately 10–45 kHz. It highly depends on the process, voltage, and temperature.

The OSC32k runs from VDD_SNVS_CAP supply, which comes from the

VDD_HIGH_IN/VDD_SNVS_IN. The target battery is a ~3 V coin cell. Proper choice of coin cell type

is necessary for chosen VDD_HIGH_IN range. Appropriate series resistor (Rs) must be used when

connecting the coin cell. Rs depends on the charge current limit that depends on the chosen coin cell. For

example, for Panasonic ML621:

•

Average Discharge Voltage is 2.5 V

•

Maximum Charge Current is 0.6 mA

For a charge voltage of 3.2 V, Rs = (3.2-2.5)/0.6 m = 1.17 k.

4.3

I/O parameters

This section provide parameters on I/O interfaces.

4.3.1

I/O DC parameters

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

Table 20. OSC32K main characteristics

Min

Typ

Max

Comments

Fosc

—

32.768 KHz

—

This frequency is nominal and determined mainly by the crystal selected.

32.0 K would work as well.

Current consumption

—

A—

The 4

A is the consumption of the oscillator alone (OSC32k). Total supply

consumption will depend on what the digital portion of the RTC consumes.

The ring oscillator consumes 1

A when ring oscillator is inactive, 20 A

when the ring oscillator is running. Another 1.5

A is drawn from vdd_rtc in

the power_detect block. So, the total current is 6.5

A on vdd_rtc when the

ring oscillator is not running.

Bias resistor

—

14 M



—

This integrated bias resistor sets the amplifier into a high gain state. Any

leakage through the ESD network, external board leakage, or even a

scope probe that is significant relative to this value will debias the amp. The

debiasing will result in low gain, and will impact the circuit's ability to start

up and maintain oscillations.

Crystal Properties

Cload

—

10 pF

—

Usually crystals can be purchased tuned for different Cloads. This Cload

value is typically 1/2 of the capacitances realized on the PCB on either side

of the quartz. A higher Cload will decrease oscillation margin, but

increases current oscillating through the crystal.

ESR

—

50 k



100 k

 Equivalent series resistance of the crystal. Choosing a crystal with a higher

value will decrease the oscillating margin.

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