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Can a voltage higher than VDD be supplied to the VLCD pin of the HT47R20A-1 and HT47C20-1?

April 26, 2017Pin supplied VDD vlcd voltage

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Can a voltage higher than VDD be supplied to the VLCD pin of the HT47R20A-1 and HT47C20-1?

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Answer A higher than VDD voltage supplied to VLCD pin of HT47R20A-1 and HT47C20-1 is permitted. However, the value chosen for VLCD should ensure that the highest LCD signal voltage is within the normal operating voltage range of 2.2V to 5.5V. Therefore for devices with R-type bias and C-type 1/2 bias, the VLCD supply voltage should be within 2.2V to 5.5V, while for devices with C-type 1/3 bias, the highest LCD signal voltage is 1.5 times that of the VLCD supplied voltage due to the internal charge pump, the VLCD supply voltage should be within 1.5V to 3.6V. Note that for low voltage Mask type MCUs, the V3 pin will be fixed to VDD as the LCD supply voltage. The highest LCD signal voltage will be 2 times of V3 voltage.