PCF8536AT datasheet(26/103 Pages) NXP

26 / 103 page

PCA8530

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Product data sheet

Rev. 2 — 25 September 2014

26 of 103

NXP Semiconductors

PCA8530

Automotive 102 x 4 Chip-On-Glass LCD segment driver

8.8 Start-up and shut-down

8.8.1 Power-On

At power-on, the PCA8530 resets to the following starting conditions:

1. All backplane and segment outputs are set to VSS1.

2. Input and output bank selectors are reset.

3. The interface is initialized.

4. The data pointer is cleared (set logic 0).

5. The internal oscillator is disabled.

6. Temperature measurement is disabled.

7. Temperature filter is disabled.

8. The internal VLCD voltage generation is disabled. The charge pump is switched off.

9. The VLCD temperature compensation is disabled.

10. The display is disabled.

8.8.2 Recommended start-up sequences

General remarks:

1. Do not transfer data for at least 1 ms after a power-on to allow the reset action to

complete.

2. The first command sent to the device after the power-on event must be the Initialize

command (see Section 8.2.1.1 on page 10).

3. After the initialization, the desired values have to be set by the commands listed in

Table 5 on page 8.

4. Before enabling the display, the RAM content should be brought to a defined status

– by clearing it (setting it all logic 0) or

– by writing meaningful content (for example, a graphic)

otherwise unwanted display artifacts may appear on the display.

The following sequences describe how to proceed with the initialization of the chip in

different application modes.

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