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Overview

Opal includes a Dialog Semiconductor DA9053 which provides power supply and touch/analog features.
The DA9053 is available in standard and automotive variants.
For detailed information on the capabilities of the DA9053, consult the Dialog Semiconductor datasheet.

The standard Opal module part includes the auto-start/automotive temperature DA9053 variant. Opal Development Kits may have the non-auto-start version.

 

Power supplies

This section details the power input and output requirements of the Opal module, as managed by the DA9053.

Input

Opal has 3 main input power supplies:

  1. DC input
  2. USB power input (VBUS)
  3. Li-Ion Battery (single cell)

The battery features is not currently supported by any of the Operating Systems available for Opal. Contact us if this features is important to your application.


The specifications for these inputs are shown in the table below.

Pad

Input Voltage

Name

Max current draw

Notes

B-159 -168

5V

DCIN

-

Main power in from DC supply.

A-1 to 4,
A165-168

 

VBUS

-

Alternate main power if using a battery and USB charging. The DA9053 can manage the charging process and maintain current draw on this rail to the limits described in the USB specification.
The PMIC_D+ and PMIC_D- signals should be used to enable this functionality.

A6-10,
A

 

VBAT

-

Battery connection. Use single cell Li-Ion.
Opal will not boot unless a battery or 47uF capacitor is attached to this rail.

B-4

 

VBBAT

6mA

Backup battery connection. Re-chargeable Li-Ion coin-cell or Super-Cap.

Output

Opal provides several power rails for use on your base-board design. The following table details the rails available, and the maximum power that can be drawn.

Pad

Voltage

Name

Max current available

Notes

B-19 –B-21

3.3V

DCDC_3V3

800mA
(combined with FEC_3V3)

3.3V supply output from the module. This is supplied by an additional buck-boost regulator (not part of the DA9053).

B-23

n/a

VDDCORE

10mA

Use this to pull up the power button with a 10k resistor if used.

B-8

3.3V

VLDO3_3V3

150mA

Additional 3.3V supply from the DA9053

B-3

2.775V

VLDO4_2V775

100mA

LCD Logic supply from the DA9053

B-11

1.8V

VLDO8_1V8

150mA

1.8V supply from the DA9053

B-22

3.3V

FEC_3V3

800mA (combined with DCDC_3V3)

Ethernet supply. This is derived from DCDC_3V3 and filtered on the module.

 

Touch and Analog Interface

The DA9053 includes an analog block for touch screen, battery measurement and general purpose analog inputs.

Pad

Signal Name

Description

B-29

TS_YN

Touch screen inputs for 4-wire resistive device.

B-30

TS_YP

 

B-26

TS_XN

 

B-28

TS_XP

 

B-34

TSREF

Touch screen reference voltage. Not required for touch-screen operation.

B-27

TBAT

For battery measurement. Connect to NTC resistor.

B-145

ADCIN4

General purpose 2.5V, 10-bit ADC inputs.

B-147

ADCIN5

 

B-148

ADCIN6

 

Power Button and Boot

The DA9053 controls the supply rails during boot for the i.MX53.
This is initiated by pulling the nONKEY signal low. There are two configurations for this signal possible with the DA9053:

  • Power on when the key is pressed
  • Power on when power is applied (auto power-on)

This option is set in the DA9053 part at the (Dialog) factory and cannot be altered.

The standard Opal part has the auto power-on bit enabled, however you may have a development kit which required you to press the power button.

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