pcf8536 NXP Semiconductors, pcf8536 Datasheet - Page 8

• Manufacturer Part Number: pcf8536
• Description: Universal Lcd Driver For Low Multiplex Rates Including A 6 Channel Pwm Generator
• Manufacturer: NXP Semiconductors

NXP Semiconductors
PCF8536
Product data sheet
8.1.2 Command: OTP-refresh
8.1.3 Command: PWM-inversion
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.
Table 6.
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
page
Table 7.
[1]
Bit
7 to 0
Bit
7 to 1
0
Default value.
45.
Symbol
-
Symbol
-
PWMI
OTP-refresh - OTP-refresh command bit description
PWM-inversion - PWM inversion command bit description
All information provided in this document is subject to legal disclaimers.
Universal LCD low multiplex driver with 6 channel PWM generator
Rev. 1 — 6 October 2011
Value
11110000
Value
0001010
1
0
[1]
Description
fixed value
Description
fixed value
PWM inversion mode
PWM inversion mode on
PWM inversion mode off
PCF8536
© NXP B.V. 2011. All rights reserved.
Section 8.11.2 on
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