topic KL4x SLCD Charge Pump voltage in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/KL4x-SLCD-Charge-Pump-voltage/m-p/349387#M17145 <HTML><HEAD></HEAD><BODY><P>Our customer would like to confirm the voltage of the LCD glass when disable and enable charge pump.</P><P>Because their products is battery operated application.</P><P>Here is my understanding.</P><P>When disable charge pump(CPSEL=0), the voltage of the LCD glass is depends on VDD.</P><P>When enable chaege pump(CPSEL=1), the voltage of the LCD glass is depends on LCD_GCR[RVTRIM] value. In other word, they can adjust the voltage of the LCD glass by LCD_GCR[RVTRIM], it voltage is VIREG(0.91V to 1.09V) * 3.</P><P></P><P>Am I correct?</P><P></P><P>Please advise as soon as possible.</P><P></P><P>Best regards,</P><P>Takashima</P></BODY></HTML> Tue, 09 Sep 2014 07:00:21 GMT isaotakashima 2014-09-09T07:00:21Z KL4x SLCD Charge Pump voltage https://community.nxp.com/t5/Kinetis-Microcontrollers/KL4x-SLCD-Charge-Pump-voltage/m-p/349387#M17145 <HTML><HEAD></HEAD><BODY><P>Our customer would like to confirm the voltage of the LCD glass when disable and enable charge pump.</P><P>Because their products is battery operated application.</P><P>Here is my understanding.</P><P>When disable charge pump(CPSEL=0), the voltage of the LCD glass is depends on VDD.</P><P>When enable chaege pump(CPSEL=1), the voltage of the LCD glass is depends on LCD_GCR[RVTRIM] value. In other word, they can adjust the voltage of the LCD glass by LCD_GCR[RVTRIM], it voltage is VIREG(0.91V to 1.09V) * 3.</P><P></P><P>Am I correct?</P><P></P><P>Please advise as soon as possible.</P><P></P><P>Best regards,</P><P>Takashima</P></BODY></HTML> Tue, 09 Sep 2014 07:00:21 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/KL4x-SLCD-Charge-Pump-voltage/m-p/349387#M17145 isaotakashima 2014-09-09T07:00:21Z Re: KL4x SLCD Charge Pump voltage https://community.nxp.com/t5/Kinetis-Microcontrollers/KL4x-SLCD-Charge-Pump-voltage/m-p/349388#M17146 <HTML><HEAD></HEAD><BODY><P>Hi, Takashima-san</P><P></P><P>I think you are correct. Thanks.</P><P></P><P>Best Regards</P><P>Paul</P></BODY></HTML> Wed, 10 Sep 2014 06:00:33 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/KL4x-SLCD-Charge-Pump-voltage/m-p/349388#M17146 Paul_Tian 2014-09-10T06:00:33Z