PT6526

V1.1

11

November 2009

DISPLAY CONTROL AND THE /INH PIN

When power is initialized, the internal data of PT6526 (that is, display data – D1 to D204 and the control data) are not

defined. Irrelevant displays caused by the undefined internal data can be prevented by using the following procedures.

The /INH pin must be set to “LOW” at the same time as the power is applied to turn OFF the display. Doing this will set

the output pins – SG1/P1 to SG12/P12, SG13 to SG51 and COM1 to COM4 to “LOW” level. While the /INH pin is held at

“LOW” level, the microcontroller must send the serial data. Then the application can set the /INH pin to “HIGH”. Please

refer to the figure below.

Notes:

1. t1 = determined by the value of C and R.

2. tc = 10us (minimum)