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PCF8536AT Datasheet(PDF) 8 Page - NXP Semiconductors

Part # PCF8536AT
Description  Universal LCD driver for low multiplex rates including a 6 channel PWM generator
PDF  74 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8536AT Datasheet(HTML) 8 Page - NXP Semiconductors

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PCF8536
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
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
1
PWM inversion mode on
0[1]
PWM inversion mode off



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