PCA9620 datasheet(6/71 Pages) NXP

6 / 71 page

PCA9620

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Product data sheet

Rev. 1 — 9 December 2010

6 of 71

NXP Semiconductors

PCA9620

Universal LCD driver for low multiplex rates

7.1.2 Command: OTP-refresh

During production and testing of the device, each IC is calibrated in order to achieve the

specified accuracy of VLCD, the frame frequency, and the temperature measurement. This

calibration is performed on EPROM cells called One Time Programmable (OTP) cells.

These cells are being read by the device at power-on, after a reset, and every time when

the initialize command or the OTP-refresh command is sent. This command will take

approximately 10 ms to finish.

7.1.3 Command: oscillator-ctrl

The oscillator-ctrl command switches between internal and external oscillator and enables

or disables pin CLK.

[1]

Default value.

Table 5.

Initialize - initialize command bit description

Bit

Symbol

Value

Description

7 to 0

00111010

fixed value

Table 6.

OTP-refresh - OTP-refresh command bit description

Bit

Symbol

Value

Description

7 to 0

11010000

fixed value

Table 7.

Oscillator-ctrl - oscillator control command bit description

For further information, see Section 7.5 on page 38.

Bit

Symbol

Value

Description

7 to 2

110011

fixed value

COE

control pin CLK

0[1]

clock signal not available on pin CLK;

pin CLK is in 3-state and may be left floating

clock signal available on pin CLK

OSC

oscillator source

0[1]

internal oscillator running

external oscillator used;

pin CLK becomes an input

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