PCA9620 datasheet(15/71 Pages) NXP

15 / 71 page

PCA9620

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Product data sheet

Rev. 1 — 9 December 2010

15 of 71

NXP Semiconductors

PCA9620

Universal LCD driver for low multiplex rates

9. Temperature filter is disabled.

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

11. The VLCD temperature compensation is enabled.

12. The display is disabled.

Remark: Do not transfer data on the I2C-bus for at least 1 ms after a power-on to allow

the reset action to complete.

The first command sent to the device after the power-on event must be the initialize

command (see Section 7.1.1 on page 5).

After Power-On Reset (POR) and 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 (e.g. a graphic)

otherwise unwanted display artifacts may appear on the display.

Table 25.

Reset states

Bits labeled - are undefined at power-on.

Command name

Bits

initialize

OTP-refresh

101

oscillator-ctrl

100

charge-pump-ctrl

100

temp-msr-ctrl

temp-comp-SLA

001

temp-comp-SLB

010

temp-comp-SLC

010

temp-comp-SLD

011

set-VPR-MSB

100

set-VPR-LSB

101

display-enable

set-MUX-mode

000

set-bias-mode

100

load-data-pointer

frame-frequency

input-bank-select

000

output-bank-select

write-RAM-data

---

temp-read

100

invmode_CPF_ctrl

101

temp-filter

101

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