PCF8536AT datasheet(8/74 Pages) NXP

8 / 74 page

PCF8536

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Product data sheet

Rev. 2 — 21 February 2012

8 of 74

NXP Semiconductors

PCF8536

Universal LCD low multiplex driver with 6 channel PWM generator

8.1.2 Command: OTP-refresh

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

accuracy of the frame frequency. This calibration is performed on EPROM cells called

One Time Programmable (OTP) cells. The device reads these cells every time the

OTP-refresh command is sent. This instruction has to be sent after a reset has been

made and before the display is enabled.

This command will be completed after a maximum of 30 ms and requires either the

internal or external clock to run. If the internal oscillator is not used, then a clock must be

supplied to the OSCCLK pin. If the OTP-refresh instruction is sent and no clock is present,

then the request is stored until a clock is available.

Remark: It is recommended not to enter power-down mode during the OTP refresh cycle.

8.1.3 Command: PWM-inversion

It is possible to invert the output of the PWM generators. This function may be useful for

counteracting EMC issues. The description of this mode can be found in Section 8.11.2 on

page 45.

[1]

Default value.

Table 6.

OTP-refresh - OTP-refresh command bit description

Bit

Symbol

Value

Description

7 to 0

11110000

fixed value

Table 7.

PWM-inversion - PWM inversion command bit description

Bit

Symbol

Value

Description

7 to 1

0001010

fixed value

0PWMI

PWM inversion mode

PWM inversion mode on

0[1]

PWM inversion mode off

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