In addition, the calibrator uses a 4×3 numerical keypad and a 16×2-sized GDM1602B LCD module with an HD44780 LCD interface. The calibrator has two modes. First, it produces current at the level of the ...

LCD circuits often require a –10V voltage at 2 to 15 mA to bias a graphics-LCD-driver IC. You can usually accomplish this task with an external charge-pump IC, such as Maxim’s ICL7660, but that ...